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| w DESCRIPTION The WM8741 is a very high performance stereo DAC designed for audio applications such as professional recording systems, A/V receivers and high specification CD, DVD and home theatre systems. The device supports PCM data input word lengths from 16 to 32-bits and sampling rates up to 192kHz. The WM8741 also supports DSD bitstream data format, in both direct DSD and PCM-converted DSD modes. The WM8741 includes fine resolution volume and soft mute control, digital de-emphasis and a range of advanced digital filter responses, followed by a digital interpolation filter, multi-bit sigma delta modulator and stereo DAC. Wolfson's patented architecture optimises the linearity of the DAC and provides maximum insensitivity to clock jitter. The digital filters include several selectable roll-off and performance characteristics. The user can select between standard sharp or slow roll-off responses. In addition, the WM8741 includes a selection of advanced digital filter characteristics including non-half band filters and minimum phase filters. This flexibility provides a range of benefits, such as significantly reduced pre-ringing and minimal group delay. The internal digital filters can also be by-passed and the WM8741 used with an external digital filter. The WM8741 supports two connection schemes for audio DAC control. The 2/3 wire serial control interface provides access to all features. A range of features can also be accessed by hardware control interface. The WM8741 is available in a convenient 28-SSOP package, and is pin compatible with the WM8740. WM8741 24-bit 192kHz DAC with Advanced Digital Filtering FEATURES * Advanced Ultra High Performance Multi-bit Sigma-Delta Architecture - 128dB SNR (`A'-weighted mono @ 48kHz) - 125dB SNR (`A'-weighted stereo @ 48kHz) - 123dB SNR (non-weighted stereo @ 48kHz) - -100dB THD @ 48kHz - Differential analogue voltage outputs - High tolerance to clock jitter PCM Mode - Sampling frequency: 32kHz to 192kHz - Input data word length support: 16 to 32-bit - Supports all standard audio interface formats - Selectable advanced digital filter responses - Includes linear/minimum phase and range of tailored characteristics - Enables low pre-ringing, minimal latency - Optional interface to industry standard external filters - Digital volume control in 0.125dB steps with soft ramp and soft mute - Anti-clipping mode to prevent distortion even with input signals recorded up to 0dB - Selectable de-emphasis support - Zero Flag output DSD Mode - DSD bit-stream support for SACD applications - Support for normal or phase modulated bit-streams - Direct or PCM converted DSD paths (DSD Plus) - DSD mute Hardware or software control modes: - 2 and 3 wire serial control interface support Pin compatible with WM8740 4.5V to 5.5V analogue, 3.0V to 3.6V digital supply operation 28-lead SSOP Package * * * * * * APPLICATIONS * * * * Professional audio systems CD, DVD, SACD audio Home theatre systems A/V receivers WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Product Preview, October 2007, Rev 1.3 Copyright (c)2007 Wolfson Microelectronics plc WM8741 BLOCK DIAGRAM Product Preview CONTROL INTERFACE PCM ATTENUATION / MUTE PCM PCM DIGITAL FILTERS BCLK/DSD64CLK FSEL/DINR DIN/DINL LRCLK/DSDL/DSDIN IWO/DOUT OSR/DSDR DSD TO PCM CONVERTOR DSD DSD ATTENUATION / MUTE AUDIO INTERFACE SIGMA DELTA MODULATOR VMIDL PCM ATTENUATION / MUTE SIGMA DELTA MODULATOR VOUTLP DAC LEFT VOUTLN VOUTRP DAC RIGHT VOUTRN W WM8741 VMIDR w PP Rev 1.3 October 2007 2 Product Preview WM8741 TABLE OF CONTENTS DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................2 TABLE OF CONTENTS .........................................................................................3 PIN CONFIGURATION...........................................................................................5 ORDERING INFORMATION ..................................................................................5 PIN DESCRIPTION (SOFTWARE CONTROL MODE) ..........................................6 PIN DESCRIPTION (HARDWARE CONTROL MODE)..........................................8 ABSOLUTE MAXIMUM RATINGS.......................................................................10 THERMAL PERFORMANCE ...............................................................................10 RECOMMENDED OPERATING CONDITIONS ...................................................11 ELECTRICAL CHARACTERISTICS ....................................................................11 MASTER CLOCK TIMING ........................................................................................... 13 PCM DIGITAL AUDIO INTERFACE TIMINGS............................................................. 13 DSD AUDIO INTERFACE TIMINGS............................................................................ 14 CONTROL INTERFACE TIMING - 3-WIRE MODE .................................................... 15 CONTROL INTERFACE TIMING - 2-WIRE MODE .................................................... 16 INTERNAL POWER ON RESET CIRCUIT.................................................................. 17 DEVICE DESCRIPTION.......................................................................................19 INTRODUCTION ......................................................................................................... 19 CLOCKING SCHEMES ............................................................................................... 19 CONTROL INTERFACE.............................................................................................. 19 SOFTWARE CONTROL INTERFACE......................................................................... 20 3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE ....................................................................................................... 20 3-WIRE CONTROL INTERFACE DAISY CHAINING............................................................................................................... 20 2-WIRE SERIAL CONTROL MODE ................................................................................................................................... 22 DIGITAL AUDIO INTERFACE ..................................................................................... 22 PCM MODE................................................................................................................................................................. 22 PCM DIGITAL AUDIO INTERFACE ................................................................................................................................... 23 LEFT JUSTIFIED MODE.................................................................................................................................................. 23 RIGHT JUSTIFIED MODE................................................................................................................................................ 24 I S MODE.................................................................................................................................................................... 24 DSP MODE A .............................................................................................................................................................. 25 DSP MODE B .............................................................................................................................................................. 25 PCM MODE SAMPLING RATES ...................................................................................................................................... 25 8FS MODE .................................................................................................................................................................. 26 8FS MODE SAMPLING RATES ....................................................................................................................................... 27 AUDIO INTERFACE DAISY CHAINING ............................................................................................................................... 27 2 DSD MODE ................................................................................................................. 28 DSD DIRECT ............................................................................................................................................................... 28 DSD PLUS MODE ......................................................................................................................................................... 28 DSD DIGITAL AUDIO INTERFACE ................................................................................................................................... 28 SOFTWARE CONTROL MODE .................................................................................. 29 DSD AND PCM MODE SWITCHING ................................................................................................................................ 29 PCM DIGITAL AUDIO INTERFACE CONTROL REGISTERS .................................................................................................. 29 LRCLK POLARITY........................................................................................................................................................ 30 w PP Rev 1.3 October 2007 3 WM8741 Product Preview BCLK / DSDCLK64 POLARITY ..................................................................................................................................... 30 OVERSAMPLING RATE CONTROL................................................................................................................................... 30 MCLK/LRCLK RATIO CONTROL (NORMAL PCM MODE) ................................................................................................. 31 8FS MODE .................................................................................................................................................................. 31 MCLK/LRCLK RATIO CONTROL (8FS MODE)................................................................................................................ 31 ATTENUATION CONTROL............................................................................................................................................... 31 DAC OUTPUT ATTENUATION......................................................................................................................................... 32 ATTENUATION CONTROL MODE ..................................................................................................................................... 32 VOLUME RAMP MODE................................................................................................................................................... 33 ANTI-CLIPPING DIGITAL ATTENUATION MODE.................................................................................................................. 33 DSD PLUS GAIN CONTROL ........................................................................................................................................... 33 MUTE MODES .............................................................................................................................................................. 34 ZERO FLAG OUTPUT .................................................................................................................................................... 35 ZFLAG FORCE HIGH CONTROL .................................................................................................................................... 35 INFINITE ZERO DETECT................................................................................................................................................. 35 DE-EMPHASIS .............................................................................................................................................................. 36 OUTPUT PHASE REVERSAL ........................................................................................................................................... 36 DIFFERENTIAL MONO MODE.......................................................................................................................................... 37 DITHER ....................................................................................................................................................................... 37 NORMAL PCM MODE DIGITAL FILTER SELECTION........................................................................................................... 38 8FS MODE DIGITAL FILTER........................................................................................................................................... 38 DSD PLUS FILTER SELECTION ...................................................................................................................................... 38 DSD DIRECT DIGITAL FILTER........................................................................................................................................ 38 DSD MUTE CONTROL .................................................................................................................................................. 39 POWER SAVING STANDBY CONTROL ............................................................................................................................. 39 HARDWARE CONTROL MODE.................................................................................. 39 DSD AND PCM MODE SWITCHING............................................................................................................................... 39 AUDIO INPUT FORMAT .................................................................................................................................................. 39 OVERSAMPLING RATE CONTROL ................................................................................................................................... 40 MUTE PIN.................................................................................................................................................................... 40 ZERO FLAG............................................................................................................................................................... 41 DE-EMPHASIS CONTROL AND ANTI-CLIPPING MODE ........................................................................................................ 41 DIGITAL FILTER SELECTION........................................................................................................................................... 42 DIFFERENTIAL MONO MODE.......................................................................................................................................... 42 OVERVIEW OF FUNCTIONS...............................................................................43 REGISTER MAP...................................................................................................44 REGISTER MAP...................................................................................................44 DIGITAL FILTER CHARACTERISTICS ...............................................................49 PCM MODE FILTER CHARACTERISTICS ................................................................. 49 8FS MODE FILTER CHARACTERISTICS................................................................... 51 DSD PLUS MODE FILTER CHARACTERISTICS ....................................................... 52 DSD DIRECT MODE FILTER CHARACTERISTICS ................................................... 52 PCM MODE FILTER RESPONSES............................................................................. 53 8FS MODE FILTER RESPONSES .............................................................................. 58 DSD PLUS MODE FILTER RESPONSES................................................................... 58 DSD DIRECT MODE FILTER RESPONSES............................................................... 59 DEEMPHASIS FILTER RESPONSES ......................................................................... 60 APPLICATIONS INFORMATION .........................................................................61 PACKAGE DIMENSIONS ....................................................................................62 IMPORTANT NOTICE ..........................................................................................63 ADDRESS: .................................................................................................................. 63 w PP Rev 1.3 October 2007 4 Product Preview WM8741 PIN CONFIGURATION ORDERING INFORMATION DEVICE WM8741GEDS WM8741GEDS/R TEMPERATURE RANGE -25 to +85C -25 to +85C PACKAGE 28-lead SSOP (Pb-free) 28-lead SSOP (Pb-free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL 1 MSL 1 PEAK SOLDERING TEMPERATURE 260C 260C Note: Reel Quantity = 2,000 w PP Rev 1.3 October 2007 5 WM8741 PIN DESCRIPTION (SOFTWARE CONTROL MODE) PIN NAME TYPE PCM MODE 1 2 3 4 5 6 LRCLK / DSDL DIN / DINL BCLK / DSD64CLK FSEL / DINR MCLK DIFFHW Digital input Digital input Digital input Digital input Tri-level Digital input Digital input Internal pulldown Audio interface left/right clock input Audio interface data input Audio interface bit clock input Unused Master clock input Differential mono mode selection 0 = normal operation 1 = differential mono mode Digital ground Digital supply Right analogue positive reference Right analogue negative reference Right analogue midrail decoupling pin Right DAC positive output Right DAC negative output Analogue ground Analogue supply Left DAC negative output Left DAC positive output Left analogue midrail decoupling pin Left analogue negative reference Left analogue positive reference Zero flag output Unused Buffered audio interface data output DESCRIPTION 8FS PCM MODE Audio interface left/right clock input Audio interface left data input Audio interface bit clock input Audio interface right data input Master clock input Differential mono mode selection 0 = normal operation 1 = differential mono mode Digital ground Digital supply Right analogue positive reference Right analogue negative reference Right analogue midrail decoupling pin Right DAC positive output Right DAC negative output Analogue ground Analogue supply Left DAC negative output Left DAC positive output Left analogue midrail decoupling pin Left analogue negative reference Left analogue positive reference Zero flag output Unused Unused Product Preview DSD MODES DSD left audio data in Unused 64fs system clock input Unused Unused Differential mono mode selection 0 = normal operation 1 = differential mono mode Digital ground Digital supply Right analogue positive reference Right analogue negative reference Right analogue midrail decoupling pin Right DAC positive output Right DAC negative output Analogue ground Analogue supply Left DAC negative output Left DAC positive output Left analogue midrail decoupling pin Left analogue negative reference Left analogue positive reference Zero flag output DSD right audio data in Unused 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 DGND DVDD AVDDR AGNDR VMIDR VOUTRP VOUTRN AGND AVDD VOUTLN VOUTLP VMIDL AGNDL AVDDL ZFLAG OSR/DSDR IWO / DOUT Supply Supply Analogue Input Analogue Input Analogue Output Analogue Output Analogue Output Supply Supply Analogue Output Analogue Output Analogue Output Analogue Input Analogue Input Digital Output Digital input Tri-level Digital input/output w PP Rev 1.3 October 2007 6 Product Preview PIN NAME TYPE PCM MODE 24 MODE / LRSEL Digital input, tri-level When DIFFHW=0: 0 = hardware mode 1 = 3-wire software mode Z = 2-wire software mode When DIFFHW=1: 0 = left channel mono 1 = right channel mono Softmute Control 0 = mute active 1 = normal operation NOTE: In 3-wire mode only, this pin may be used as a buffered control interface data output Serial control interface data input Serial control interface clock input 3-wire mode: serial control interface latch 2-wire mode: device address select DESCRIPTION 8FS PCM MODE When DIFFHW=0: 0 = hardware mode 1 = 3-wire software mode Z = 2-wire software mode When DIFFHW=1: 0 = left channel mono 1 = right channel mono Softmute Control 0 = mute active 1 = normal operation WM8741 DSD MODES When DIFFHW=0: 0 = hardware mode 1 = 3-wire software mode Z = 2-wire software mode When DIFFHW=1: 0 = left channel mono 1 = right channel mono Softute Control 0 = mute active 1 = normal operation NOTE: In DSD Direct mode this is an analogue mute 25 MUTEB / SDOUT Digital input or output: Internal pull-up 26 27 28 SDIN / DEEMPH SCLK / DSD CSB / SADDR / I 2S Digital input Tri-level Digital input Digital input Serial control interface data input Serial control interface clock input 3-wire mode: serial control interface latch 2-wire mode: device address select Serial control interface data input Serial control interface clock input 3-wire mode: serial control interface latch 2-wire mode: device address select Notes: 1. 2. Undefined inputs should be connected to DVDD or DGND Tri-level pins which require the `Z' state to be selected should be left floating (open) w PP Rev 1.3 October 2007 7 WM8741 PIN DESCRIPTION (HARDWARE CONTROL MODE) PIN NAME TYPE PCM MODE 1 2 3 4 5 6 LRCLK / DSDL DIN / DINL BCLK / DSD64CLK FSEL / DINR MCLK DIFFHW Digital input Digital input Digital input Digital input Tri-level Digital input Digital input Internal pulldown Supply Supply Analogue Input Analogue Input Analogue Output Analogue Output Analogue Output Supply Supply Analogue Output Analogue Output Analogue Output Analogue Input Analogue Input Digital Output Digital input Tri-level Audio interface left/right clock input Audio interface data input Audio interface bit clock input Selects between one of three digital filters - see Table 48 Master clock input Differential mono mode selection 0 = normal operation 1 = differential mono mode Digital ground Digital supply Right analogue positive reference Right analogue negative reference Right analogue midrail decoupling pin Right DAC positive output Right DAC negative output Analogue ground Analogue supply Left DAC negative output Left DAC positive output Left analogue midrail decoupling pin Left analogue negative reference Left analogue positive reference Zero flag output Controls internal oversampling rate: 0 = low rate Z = medium rate 1 = high rate Controls audio interface wordlength - see Table 44 DESCRIPTION Product Preview DSD DIRECT MODE DSD left audio data in Unused 64fs system clock input Unused Unused Differential mono mode selection 0 = normal operation 1 = differential mono mode Digital ground Digital supply Right analogue positive reference Right analogue negative reference Right analogue midrail decoupling pin Right DAC positive output Right DAC negative output Analogue ground Analogue supply Left DAC negative output Left DAC positive output Left analogue midrail decoupling pin Left analogue negative reference Left analogue positive reference Zero flag output DSD right audio data in 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 DGND DVDD AVDDR AGNDR VMIDR VOUTRP VOUTRN AGND AVDD VOUTLN VOUTLP VMIDL AGNDL AVDDL ZFLAG OSR/DSDR 23 IWO / DOUT Digital input/output Unused w PP Rev 1.3 October 2007 8 Product Preview PIN NAME TYPE PCM MODE 24 MODE / LRSEL Digital input, tri-level When DIFFHW=0: 0 = hardware mode 1 = 3-wire software mode Z = 2-wire software mode When DIFFHW=1: 0 = left channel mono 1 = right channel mono Softmute Control 0 = mute active 1 = normal operation De-emphasis Control 0 = normal operation 1 = de-emphasis applied Z = anti-clipping digital filter mode HW Mode Select: 0 = PCM 1 = DSD Direct Controls audio interface format - see Table 44 DESCRIPTION WM8741 DSD DIRECT MODE When DIFFHW=0: 0 = hardware mode 1 = 3-wire software mode Z = 2-wire software mode When DIFFHW=1: 0 = left channel mono 1 = right channel mono Analogue Mute Control 0 = mute active 1 = normal operation Unused 25 MUTEB / SDOUT Digital input or output: Internal pull-up Digital input Tri-level 26 SDIN / DEEMPH 27 SCLK / DSD CSB / SADDR / I 2S Digital input HW Mode Select: 0 = PCM 1 = DSD Direct Unused 28 Digital input Notes: 1. 2. Undefined inputs should be connected to DVDD or DGND Tri-level pins who require the `Z' state to be selected should be left floating (open) w PP Rev 1.3 October 2007 9 WM8741 ABSOLUTE MAXIMUM RATINGS Product Preview Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical Characteristics at the test conditions specified. ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. Wolfson Microelectronics tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage conditions prior to surface mount assembly. These levels are: MSL1 = unlimited floor life at <30C / 85% Relative Humidity. Not normally stored in moisture barrier bag. MSL2 = out of bag storage for 1 year at <30C / 60% Relative Humidity. Supplied in moisture barrier bag. MSL3 = out of bag storage for 168 hours at <30C / 60% Relative Humidity. Supplied in moisture barrier bag. The Moisture Sensitivity Level for each package type is specified in Ordering Information. CONDITION Digital supply voltage, DVDD Analogue supply voltage, AVDD Voltage range digital inputs Voltage range analogue inputs Master Clock Frequency Operating temperature range, TA Storage temperature Ambient temperature (supplies applied) Pb free package body temperature (soldering 10 seconds) Pb free package body temperature (soldering 2 minutes) Notes: 1. Analogue and digital grounds must always be within 0.3V of each other. -25C -65C -55C MIN -0.3V -0.3V DGND - 0.3V AGND - 0.3V MAX +4.5V +7V DVDD + 0.3V AVDD + 0.3V 38.462MHz +85C +150C +125C +260C +183C THERMAL PERFORMANCE PARAMETER Thermal resistance - junction to case Thermal resistance - junction to ambient SYMBOL JC JA TEST CONDITIONS MIN TYP 23.9 67.1 MAX UNIT C/W C/W w PP Rev 1.3 October 2007 10 Product Preview WM8741 RECOMMENDED OPERATING CONDITIONS PARAMETER Digital supply range Analogue supply range Ground Difference DGND to AGND Analogue operating current Digital operating current Analogue standby current Digital standby current IAVDD IDVDD IAVDD (Standby) IDVDD (Standby) AVDD = 5V DVDD = 3.3V AVDD = 5V Clocks stopped DVDD = 3.3V Clocks stopped SYMBOL DVDD AVDD AGND, DGND -0.3 TEST CONDITIONS MIN 3.0 4.5 TYP 3.3 5 0 0 55 40 45 1.5 +0.3 MAX 3.6 5.5 UNIT V V V V mA mA mA mA ELECTRICAL CHARACTERISTICS TEST CONDITIONS AVDD = 5V, DVDD = 3.3V, AGND, DGND = 0V, TA = +25 C, 1kHz test signal, fs = 48kHz, MCLK = 256fs unless otherwise stated. PARAMETER Digital Logic Levels Input LOW level Input HIGH level Output LOW level Output HIGH level DSD Input Characteristics Full-scale modulation depth DAC Performance Signal to Noise Ratio (Note 1) SNR A-weighted mono @ fs = 48kHz A-weighted stereo @ fs = 48kHz A-weighted stereo @ fs = 96kHz A-weighted stereo @ fs = 192kHz Non-weighted stereo @ fs = 48kHz Dynamic Range (Note 2) Total Harmonic Distortion (Note 2) DNR THD A=weighted, -60dB full scale input Mono 0dB @ fs = 48kHz Stereo 0dB @ fs = 48kHz Stereo 0dB @ fs = 96kHz Stereo 0dB @ fs = 192kHz Channel Separation Channel Level Matching Channel Phase Deviation Power Supply Rejection Ratio PSRR 100mVpp at 1kHz 20Hz to 20kHz 100mVpp 128 125 123 120 122 125 -100 -100 -100 -100 130 0.1 0.01 -80 -67 dB dB dB dB dB dB dB dB dB dB dB dB Degree dB dB DSD Direct or DSD Plus Mode -2.9 71.6 dB % VIL VIH VOL VOH IOL = 2mA IOH = 2mA 0.9 x DVDD 0.7 x DVDD 0.1 x DVDD 0.3 x DVDD V V V V SYMBOL TEST CONDITIONS MIN TYP MAX UNIT o w PP Rev 1.3 October 2007 11 WM8741 TEST CONDITIONS Product Preview AVDD = 5V, DVDD = 3.3V, AGND, DGND = 0V, TA = +25oC, 1kHz test signal, fs = 48kHz, MCLK = 256fs unless otherwise stated. PARAMETER Internal Analogue Filter Bandwidth Passband edge response Analogue Output Levels PCM full scale differential output level DSD Direct full scale differential output level DSD Plus full scale differential output level Minimum resistance load Maximum capacitance load Output DC level Reference Levels Potential divider resistance Voltage at VMIDL/VMIDR Notes: 1. 2. Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured `A' weighted over a 20Hz to 20kHz bandwidth. All performance measurements done with 20kHz low pass filter. Failure to use such a filter will result in higher THD and lower SNR and Dynamic Range readings than are found in the Electrical Characteristics. The low pass filter removes out of band noise; although it is not audible it may affect dynamic specification values. AVDD to VMIDL/VMIDR and VMIDL/VMIDR to AGND AVDD/2 V 10 k Into 10k load, 0dBFS input Into 10k load, 0dBFS input Into 10k load, 0dBFS input To midrail or AC coupled 2 1.34 1.4 2 1 AVDD/2 VRMS VRMS VRMS k nF V -3dB 20kHz 474 -0.0077 kHz dB SYMBOL TEST CONDITIONS MIN TYP MAX UNIT w PP Rev 1.3 October 2007 12 Product Preview WM8741 MASTER CLOCK TIMING Figure 1 Master Clock Timing Requirements Test Conditions o AVDD = 5V, DVDD = 3.3V, AGND = 0V, DGND = 0V, TA = +25 C PARAMETER Master Clock Timing Information MCLK Master clock pulse width high MCLK Master clock pulse width low MCLK Master clock cycle time MCLK Duty cycle Table 1 MCLK Timing Requirements tMCLKH tMCLKL tMCLKY 10 10 27 40:60 60:40 ns ns ns SYMBOL TEST CONDITIONS MIN TYP MAX UNIT PCM DIGITAL AUDIO INTERFACE TIMINGS Figure 2 Digital Audio Data Timing Test Conditions AVDD = 5V, DVDD = 3.3V, AGND = 0V, DGND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated. PARAMETER BCLK cycle time BCLK pulse width high BCLK pulse width low LRCLK set-up time to BCLK rising edge LRCLK hold time from BCLK rising edge DIN set-up time to BCLK rising edge DIN hold time from BCLK rising edge SYMBOL tBCY tBCH tBCL tLRSU tLRH tDS tDH TEST CONDITIONS MIN 40 16 16 8 8 8 8 TYP MAX UNIT ns ns ns ns ns ns ns Audio Data Input Timing Information Table 2 Digital Audio Interface Timing Requirements w PP Rev 1.3 October 2007 13 WM8741 DSD AUDIO INTERFACE TIMINGS Product Preview Figure 3 DSD Audio Timing - Normal Mode Figure 4 DSD Audio Timing - Phase Modulated Mode Test Conditions DVDD = 3.3V, GND = 0V, TA = +25oC, fs = 44.1kHz, DSDCLK64 = 64fs unless otherwise stated. PARAMETER DSDCLK64 cycle time DSDCLK64 pulse width high DSDCLK64 pulse width low DSD[0:1] set-up time to DSDCLK64 rising edge DSD[0:1] hold time from DSDCLK64 rising edge Difference in edge timing of DSD[0:1] to DSDCLK64 SYMBOL t64CY t64H t64L tDSN tDHN tDC 140 140 20 20 -10 10 TEST CONDITIONS MIN TYP 354.3 MAX UNIT ns ns ns ns ns ns Audio Data Input Timing Information Table 3 DSD Audio Interface Timing Requirements w PP Rev 1.3 October 2007 14 Product Preview WM8741 CONTROL INTERFACE TIMING - 3-WIRE MODE Figure 5 Control Interface Timing - 3-Wire Serial Control Mode Test Conditions o DVDD = 3.3V, GND = 0V, TA = +25 C, fs = 48kHz, MCLK = 256fs unless otherwise stated. PARAMETER SCLK rising edge to LATCH rising edge SCLK pulse cycle time SCLK pulse width low SCLK pulse width high SDIN to SCLK set-up time SCLK to SDIN hold time LATCH pulse width low LATCH pulse width high LATCH rising to SCLK rising SYMBOL tSCS tSCY tSCL tSCH tDSU tDHO tCSL tCSH tCSS TEST CONDITIONS MIN 40 80 32 32 20 20 20 20 20 TYP MAX UNIT ns ns ns ns ns ns ns ns ns Table 4 Control Interface Timing - 3-Wire Serial Control Mode w PP Rev 1.3 October 2007 15 WM8741 CONTROL INTERFACE TIMING - 2-WIRE MODE Product Preview Figure 6 Control Interface Timing - 2-Wire Serial Control Mode Test Conditions DVDD = 3.3V, DGND = 0V, TA = +25oC, Slave Mode, fs = 48kHz, MCLK = 256fs unless otherwise stated. PARAMETER SCLK Frequency SCLK Low Pulse-Width SCLK High Pulse-Width Hold Time (Start Condition) Setup Time (Start Condition) Data Setup Time SDIN, SCLK Rise Time SDIN, SCLK Fall Time Setup Time (Stop Condition) Data Hold Time Max Pulse width of spikes that will be suppressed Table 5 Control Interface Timing - 2-wire Serial Control Mode tSCL tSCH tHOL tCSE tDSU tRIS tFAL tCSS tDHO tPS 4 600 900 6 SYMBOL MIN 0 80 80 600 600 100 300 300 TYP MAX 5 UNIT MHz ns us ns ns ns ns ns ns ns ns w PP Rev 1.3 October 2007 16 Product Preview WM8741 The WM8741 includes two internal Power On Reset (POR) circuits which are used to reset the digital logic into a default state after power up and to allow the analogue circuits to power-up silently. The digital POR circuit is powered from DVDD. This circuit monitors DVDD and asserts the internal digital reset if DVDD are below the minimum DVDD threshold which will allow the digital logic to function. The analogue POR circuit is powered from AVDD. The circuit monitors AVDD, tri-stating the DAC outputs and isolating the internal reference resistor strings from AVDDL and AVDDR until there is sufficient AVDD voltage to allow the analogue DAC stages to function correctly. INTERNAL POWER ON RESET CIRCUIT Figure 7 AVDD Power up Sequence Test Conditions AVDD = 5V, AGND = 0V, TA = +25oC, TA_max = +125oC, TA_min = -25oC, AVDDmax = 5.5V, AVDDmin = 4.5V PARAMETER AVDD level to POR rising edge (AVDD rising) AVDD level to POR falling edge (AVDD falling) Table 6 Analogue POR Timing SYMBOL Vpor_hi Vpor_lo TEST CONDITIONS Measured from AGND Measured from AGND MIN TYP 2.00 1.84 MAX UNIT V V Power Supply Input Timing Information w PP Rev 1.3 October 2007 17 WM8741 Product Preview Figure 8 DVDD Power up Sequence Test Conditions DVDD = 3.3V, DGND = 0V, TA = +25oC, TA_max = +125oC, TA_min = -25oC, DVDDmax = 3.6V, DVDDmin = 3.0V PARAMETER DVDD level to POR rising edge (DVDD rising) DVDD level to POR falling edge (DVDD falling) Table 7 Digital POR Timing In a real application the designer is unlikely to have control of the relative power up sequence of AVDD and DVDD. The POR circuit ensures a reasonable delay between applying power to the device and Device Ready. Figure 7 and Figure 8 show typical power up scenarios in a real system. DVDD must be established before the device can be written to. Any writes to the device before device ready will be ignored. Note: DVDD must be established before the MCLK is started. This will ensure all synchronisation circuitry within the device is fully initialised and ready. AVDD must be established before the device will output any signal. Whilst the device will output signal as soon as the Internal Analogue PORB indicates device ready, normal operation is not possible until the VMID pin has reached the midrail voltage. SYMBOL Vpor_hi Vpor_lo TEST CONDITIONS Measured from DGND Measured from DGND MIN TYP 1.86 1.83 MAX UNIT V V Power Supply Input Timing Information w PP Rev 1.3 October 2007 18 Product Preview WM8741 DEVICE DESCRIPTION INTRODUCTION The WM8741 is an ultra high performance DAC designed for digital audio applications. Its range of features makes it ideally suited for use in professional recording environments, CD/DVD players, AV receivers and other high-end consumer audio equipment. The WM8741 is a complete differential stereo audio digital-to-analogue converter. The system includes a dithered digital interpolation filter, fine resolution volume control and digital de-emphasis, followed by a multi-bit sigma delta modulator and switched capacitor multi-bit stage with differential voltage outputs. The device supports both PCM and DSD digital audio input formats. The WM8741 includes a configurable digital audio interface support for a 3-wire and 2-wire serial control interface, and a hardware control interface. The software control interface may be asynchronous to the audio data interface; in which case control data will be re-synchronised to the audio processing internally. It is fully compatible with, and an ideal partner for, a range of industry standard microprocessors, controllers and DSPs. Uniquely, the WM8741 has a large range of high performance low latency advanced digital filters. The full range of filters is selectable in software mode, and a limited range of filters are available under hardware control. The filters allow users the flexibility to choose characteristics to match their group delay, phase and latency requirements. Operation using a master clock of 128fs, 192fs, 256fs, 384fs, 512fs or 768fs is supported. Sample rates (fs) from 32kHz to 192kHz are allowed, provided the appropriate master clock is input (see Table 1 for details). In normal PCM mode, the audio data interface supports right justified, left justified and I S interface formats along with a highly flexible DSP serial port interface. There are two DSD modes. In DSD Direct mode, the datastream is subjected to the minimum possible processing steps between input and output. In DSD Plus mode, the datastream is converted to PCM and filtered to allow reduction of out of band components. This step also provides additional benefits in allowing access to other PCM features such as volume control and advanced digital filtering. The device is packaged in a small 28-lead SSOP. 2 CLOCKING SCHEMES In a typical digital audio system there is only one central clock source producing a reference clock to which all audio data processing is synchronised. This clock is often referred to as the audio system's Master Clock. The external master system clock can be applied directly through the MCLK input pin with no software configuration necessary for sample rate selection. MCLK is used to derive clocks for the DAC path in PCM mode. The DAC path consists of DAC sampling clock, DAC digital filter clock and DAC digital audio interface timing. In a system where there are a number of possible sources for the reference clock it is recommended that the clock source with the lowest jitter be used to optimise the performance of the DAC. CONTROL INTERFACE The WM8741 supports 2-wire and 3-wire serial control, and hardware control. Selection of control mode is made by controlling the state of the MODE pin. PIN 24 NAME MODE/ LRSEL DESCRIPTION 0 = Hardware control mode 1 = 3-wire serial control mode Z = 2-wire serial control mode Table 8 Control Mode Configuration w PP Rev 1.3 October 2007 19 WM8741 SOFTWARE CONTROL INTERFACE Product Preview The software control interface may be operated using a 2-wire or 3-wire (SPI-compatible) serial interface. When operating under serial control, hardware configuration pins are ignored. Note: DIFFHW will override all other pins, forcing the device into hardware control mode and differential mode mode. 3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE Every rising edge of SCLK clocks in one bit of data on SDIN. A rising edge on CSB latches a complete control word consisting of 16 bits. The 3-wire interface protocol is shown in Figure 9. Figure 9 3-wire Serial Interface Protocol Notes: 1. 2. 3. A[6:0] are Control Address Bits D[7:0] are Control Data Bits D[8] is always set to zero 3-WIRE CONTROL INTERFACE DAISY CHAINING In daisy chaining mode, SDOUT (pin 25) outputs control data sampled on SDIN with a delay of 16 SCLK cycles. This data signal can be used to control another WM8741 in a daisy chain circuit as shown in Figure 10. SDIN SCLK CSB SDOUT SDOUT SCLK SCLK SCLK SDIN SDIN SDIN DAC #1 CSB DAC #2 CSB DAC #3 Figure 10 Control Interface Daisy Chaining Setup To configure devices into daisy chain mode the CSB signal should be driven low while there is a register write to set register bit SDOUT=1. CSB should then be driven high, this sets the first device in daisy chain mode. CSB should then be driven low again while register bit SDOUT is set high. Setting CSB high again will cause the first register write to be output to the second device from the SDOUT pin, this sets the second device into daisy chain mode. This method must be repeated for the number of devices in the chain until they are all set into daisy chain mode. Figure 11 shows the protocol for configuring the first two devices in the daisy chain. CSB w PP Rev 1.3 October 2007 20 Product Preview WM8741 Figure 11 Initial Setup of Two WM8741 Devices into Control Interface Daisy Chain Mode To write to a single device in the chain a complete sequence needs to be written to all the devices. Devices that do not require a register change must also be written to. The user can choose to write either the same data as the previous write, or write all 1s for the register address and data. All 1s will result in writing to a non-existent register, address 7Fh, preserving the current register settings. Figure 12 shows an example of how to access three WM8741 devices (the devices have all previously been configured in daisy chain mode): Figure 12 Daisy Chain Control Interface Example for Three WM8741 Devices To ensure that only valid data is written to the devices in daisy chain mode, a pull up resistor is used in SDOUT. When connected to the SDIN pin of the next device in the chain, this results in all ones being written to the control interface of that device until the correct daisy chain data is written and latched. Serial daisy chaining is available only when using 3-wire serial control mode. It is not available in 2wire serial control mode or hardware control mode. REGISTER ADDRESS R8 Mode Control 2 08h BIT 5 LABEL SDOUT DEFAULT 0 DESCRIPTION 3 wire Serial Interface Daisy Chaining 0 = No Output 1 = Output on pin 25. Table 9 Control Interface Daisy Chaining Selection w PP Rev 1.3 October 2007 21 WM8741 2-WIRE SERIAL CONTROL MODE Product Preview The WM8741 supports software control via a 2-wire serial bus. Many devices can be controlled by the same bus, and each device has a unique 7-bit address (this is not the same as the 7-bit address of each register in the WM8741). The WM8741 operates as a slave device on the 2-wire control bus. The controller indicates the start of data transfer with a high to low transition on SDIN while SCLK remains high. This indicates that a device address and data will follow. All devices on the 2-wire bus respond to the start condition and shift in the next eight bits on SDIN (7-bit address + Read/Write bit, MSB first). If the device address received matches the address of the WM8741 and the R/W bit is `0', indicating a write, then the WM8741 responds by pulling SDIN low on the next clock pulse (ACK). If the address is not recognised or the R/W bit is `1', the WM8741 returns to the idle condition and wait for a new start condition and valid address. Once the WM8741 has acknowledged a correct address, the controller sends the first byte of control data (B15 to B8, i.e. the WM8741 register address plus the first bit of register data). The WM8741 then acknowledges the first data byte by pulling SDIN low for one clock pulse. The controller then sends the second byte of control data (B7 to B0, i.e. the remaining 8 bits of register data), and the WM8741 acknowledges again by pulling SDIN low. The transfer of data is complete when there is a low to high transition on SDIN while SCLK is high. After receiving a complete address and data sequence the WM8741 returns to the idle state and waits for another start condition. If a start or stop condition is detected out of sequence at any point during data transfer (i.e. SDIN changes while SCLK is high), the device reverts to the idle condition. Figure 13 2-wire Serial Control Interface The WM8741 device address can be configured between two options. SADDR pin. PIN 28 NAME CSB/ SADDR/I2S DESCRIPTION 0 = 2-wire address 0011010 1 = 2-wire address 0011011 This is selected by the Table 10 2-wire Serial Control Mode Address Selection DIGITAL AUDIO INTERFACE PCM MODE There are a number of valid PCM data input modes. Two channel and one channel differential mono modes can be selected by serial or hardware control. It is also possible to bypass the WM8741 digital filters and apply a signal at a rate 8fs (where fs is the sampling rate) directly to the switched capacitor stage.. w PP Rev 1.3 October 2007 22 Product Preview WM8741 PCM DIGITAL AUDIO INTERFACE Audio data is applied to the DAC system via the Digital Audio Interface. Five popular interface formats are supported: * * * * * Left Justified mode Right Justified mode I2S mode DSP mode A DSP mode B All five formats require the MSB to be transmitted first, and support word lengths of 16, 20, 24 and 32 bits, with the exception that 32 bit data is not supported in right justified mode. DIN and LRCLK may be configured to be sampled on the rising or falling edge of BCLK by adjusting register bits LRP and BCP. In left justified, right justified and I2S audio interface modes, the digital audio interface receives data on the DIN input pin. Stereo audio data is time multiplexed on DIN, with LRCLK indicating whether the left or right channel is present. LRCLK is also used as a timing reference to indicate the beginning or end of the data words. The minimum number of BCLK periods per LRCLK period is two times the selected word length. LRCLK must be high for a period equal to the minimum number of BCLK periods, and low for a minimum of the same period. Any mark-to-space ratio on LRCLK is acceptable provided the above requirements are met. The WM8741 will automatically detect when data with a LRCLK period of exactly 32 BCLKs is received, and select 16-bit mode. This overrides any previously programmed word length. The operating word length will revert to a programmed value only if a LRCLK period other than 32 BCLKs is detected. In DSP mode A or DSP mode B, the data is time multiplexed onto DIN. LRCLK is used as a frame sync signal to identify the MSB of the first word. The minimum number of BCLKs per LRCLK period is two times the selected word length. Any mark to space ratio is acceptable on LRCLK provided the rising edge is correctly positioned. LEFT JUSTIFIED MODE In left justified mode, the MSB is sampled on the first rising edge of BCLK following a LRCLK transition. LRCLK is high during the left data word and low during the right data word. Figure 14 Left Justified Mode Timing Diagram w PP Rev 1.3 October 2007 23 WM8741 RIGHT JUSTIFIED MODE Product Preview In right justified mode, the LSB is sampled on the rising edge of BCLK preceding a LRCLK transition. LRCLK is high during the left data word and low during the right data word. Figure 15 Right Justified Mode Timing Diagram I S MODE In I S mode, the MSB is sampled on the second rising edge of BCLK following a LRCLK transition. LRCLK is low during the left data word and high during the right data word. 2 2 Figure 16 I2S Mode Timing Diagram w PP Rev 1.3 October 2007 24 Product Preview WM8741 DSP MODE A In DSP mode A, the first bit is sampled on the BCLK rising edge following the one that detects a low to high transition on LRCLK. No BCLK edges are allowed between the data words. The word order is DIN left, DIN right. Figure 17 DSP Mode A Timing Diagram DSP MODE B In DSP mode B, the first bit is sampled on the BCLK rising edge, which detects a low to high transition on LRCLK. No BCLK edges are allowed between the data words. The word order is DIN left, DIN right. Figure 18 DSP Mode B Timing Diagram PCM MODE SAMPLING RATES The WM8741 supports master clock rates of 128fs to 768fs, where fs is the audio sampling frequency (LRCLK), typically 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz or 192kHz. The WM8741 has a master clock detection circuit that automatically determines the relationship between the master clock frequency and the sampling rate. The master clock should be synchronised with LRCLK, although the WM8741 is tolerant of phase differences or jitter on this clock. w PP Rev 1.3 October 2007 25 WM8741 SAMPLING RATE (LRCLK) 32kHz 44.1kHz 48kHz 88.2kHz 96kHz 176.4kHz 192kHz MASTER CLOCK (MCLK) FREQUENCY (MHZ) 128fs Unavailable Unavailable Unavailable 11.2896 12.288 22.5792 24.576 192fs Unavailable Unavailable Unavailable 16.9344 18.432 33.8688 36.864 256fs 8.192 11.2896 12.288 22.5792 24.576 384fs 12.288 16.9344 18.432 33.8688 36.864 Product Preview 512fs 16.384 22.5792 24.576 768fs 24.576 33.8688 36.864 Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable Table 11 Typical Relationships Between Master Clock Frequency and Sampling Rate in normal PCM mode 8FS MODE Operation in 8FS mode requires that audio data for left and right channels is input separately on two pins. DINR (pin 4) is the input for right channel data and DINL (pin 2) is the input for left channel data. Hardware control of the device is not available. The data can be input in two formats (left or right justified), selectable by register FMT[1:0], and two word lengths (20 or 24 bit), selectable by register IWL[1:0]. In both modes the data is clocked into the WM8741 MSB first. For left justified data the word start is identified by the falling edge of LRCLK. The data is clocked in on the next 20/24 BCLK rising edges. This format is compatible with industry-standard DSPs and decoders such as the PMD100. Figure 19 8FS Mode Left Justified Timing Requirements For right justified mode, the data is justified to the rising edge of LRCLK and the data is clocked in on the preceding 20/24 BCLK rising edges before the LRCLK rising edge. This format is compatible with industry standard DSPs and decoders such as the DF1704 or SM5842. Figure 20 8FS Mode Right Justified Timing Requirements w PP Rev 1.3 October 2007 26 Product Preview In both modes the polarity of LRCLK can be switched using register bit LRP. WM8741 8FS MODE SAMPLING RATES Since the data rate in 8FS mode is much faster than in standard PCM mode, there are restrictions on the MCLK rate that can be used. Specifically, only 512fs and 768fs modes are permitted restricting the sample rate to a maximum of 8x48kHz. The master clock should be synchronised with LRCLK, although the WM8741 is tolerant of phase differences or jitter on this clock. Unlike in normal PCM mode, the master clock detection circuit does not operate in 8FS mode. The rate must be manually programmed using the control interface. SAMPLING RATE fs 32kHz 44.1kHz 48kHz LRCLK FREQUENCY (kHz) 8fs 256 352.8 384 MASTER CLOCK (MCLK) FREQUENCY (MHz) 512fs 16.384 22.5792 24.576 768fs 24.576 33.8688 36.864 Table 12 Typical Relationships Between Master Clock Frequency and Sampling Rate in 8FS Mode AUDIO INTERFACE DAISY CHAINING In daisy chain mode the DOUT pin outputs the audio data received on the DIN pin but delayed by two times the input word length. When this output is connected to the DIN pin of the next device in the chain, each WM8741 device will simultaneously sample different channel data in the same LRCLK period. Daisy chaining is only available in DSP audio interface mode and is limited by a maximum BCLK frequency of 24.576MHz. REGISTER ADDRESS R8 Mode Control 2 08h BIT 4 LABEL DOUT DEFAULT 0 DESCRIPTION Daisy Chaining Multiple devices - multichannel off one PCM feed. 0 = No Output 1 = Output on pin 23. Table 13 Daisy Chaining Audio Data Output Control The following diagram illustrates timing for a daisy chain with 2 WM8741 devices. Figure 21 Audio Interface Daisy Chaining Timing w PP Rev 1.3 October 2007 27 WM8741 DSD MODE Product Preview The WM8741 supports DSD input bitstreams at 64x the oversampling rate. The data is supplied at a rate of 64 bits per normal word clock. In DSD, no word clock is provided. The WM8741 supports two channels of bitstream or DSD audio. Data bitstreams and the 64fs clock are supplied to pins 1, 22 and 3 respectively. The MODESEL[1:0] register bits control whether the device operates in DSD direct, DSD plus or PCM modes. DSD DIRECT In DSD Direct mode the internal digital filters are bypassed, the input bitstream data is subjected to the minimal possible processing and is applied directly to the switched capacitor stage of the DAC system. Using this mode provides the purest possible representation of a DSD stream. It is normally desirable to use an external analogue post-DAC analogue filter to combine the differential outputs of the DAC and remove high frequency energy from the output. This is particularly important in the case of DSD operation due to the presence of high frequency energy which is a result of the aggressive high order noise shaping used in the creation of the modulated DSD datastream. DSD PLUS MODE In DSD Plus mode the DSD data can be filtered in a similar manner to the data in the PCM path. The DSD Plus filters are selected using register bits DSDFILT[1:0]. DSD Plus mode is not available under hardware control. Although DSD Plus mode requires that the bitstream is more heavily processed than DSD Direct, the advantage is that DSD Plus mode reduces the high frequency energy which is a result of the aggressive high order noise shaping used in the creation of the modulated DSD datastream. This means that a less aggressive, lower order, analogue filter can be used at the output. Furthermore the slew-rate requirements of the op-amps can be relaxed compared to DSD direct mode, due to the reduction in high frequency energy. DSD DIGITAL AUDIO INTERFACE DSD audio data is input to the WM8741 via the DSD digital audio interface. Two interface formats are supported: * * Uni-phase Bi-phase To use this interface apply left data on input pin 1 (LRCLK/DSDL) and pin 22 (OSR/DSDR). A DSD clock is also required, running at 64FS, and should be applied to pin 3 (BCLK/DSD64CLK). Figure 22 Uni-phase DSD Mode Timing Diagram w PP Rev 1.3 October 2007 28 Product Preview WM8741 Figure 23 Bi-phase DSD Mode Timing Diagram SOFTWARE CONTROL MODE Software control allows access to all features of the WM8741. Selection of control mode is achieved by configuring the state of MODE/LRSEL (pin 24): PIN 24 NAME MODE/ LRSEL DESCRIPTION 0 = Hardware control mode 1 = 3-wire serial control mode Z = 2-wire serial control mode Table 14 Control Mode Configuration DSD AND PCM MODE SWITCHING The audio interface mode can be switched between DSD and PCM by writing MODESEL[1:0] in R7. It is recommended that the chip is forced into a MUTE state before dynamically switching modes. REGISTER ADDRESS R7 Mode Control 1 07h BIT [1:0] LABEL MODESEL DEFAULT 00 DESCRIPTION DSD/PCM mode select : 00 = PCM mode 01 = Direct DSD Operation 10 = DSD plus mode 11 = Unused Table 15 PCM/DSD Software Mode Selection PCM DIGITAL AUDIO INTERFACE CONTROL REGISTERS The PCM digital audio input format is configured by register bits FMT [1:0] and IWL[1:0]: REGISTER ADDRESS R5 Format Control 05h BIT 1:0 LABEL IWL[1:0] DEFAULT 10 DESCRIPTION Audio interface input word length select 00 = 16-bit 01 = 20-bit 10 = 24-bit 11 = 32-bit Audio interface input format select 00 = Right justified 01 = Left justified 2 10 = I S 11 = DSP 3:2 FMT[1:0] 10 Table 16 Interface Format Controls Note: 1. In all modes, the data is signed 2's complement. The WM8741 digital filters always input 24-bit data. If the interface is programmed into 32 bits, dither is applied according to Table 37 before truncation to the internal wordlength. PP Rev 1.3 October 2007 29 w WM8741 LRCLK POLARITY Product Preview In left justified, right justified or I2S modes, the LRP register bit controls the polarity of LRCLK. If this bit is set high, the expected polarity of LRCLK will be the opposite of that shown in Figure 14, Figure 15 and Figure 16. If this feature is used as a means of swapping the left and right channels, a 1 sample phase difference will be introduced. REGISTER ADDRESS R5 Format Control 05h BIT 4 LABEL LRP DEFAULT 0 DESCRIPTION LRCLK polarity select: 0 = normal LRCLK polarity 1 = inverted LRCLK polarity Table 17 LRCLK Polarity Control In DSP modes, the LRP register bit is used to select between DSP mode A and B (see Figure 17 and Figure 18). REGISTER ADDRESS R5 Format Control 05h BIT 4 LABEL LRP DEFAULT 0 DESCRIPTION DSP format select: 0 = DSP mode A 1 = DSP mode B Table 18 DSP Format Control BCLK / DSDCLK64 POLARITY In PCM mode, LRCLK and DIN are sampled on the rising edge of BCLK by default, and should ideally change on the falling edge. Data sources which change LRCLK and DIN on the rising edge of BCLK can be supported by setting the BCP register bit. Setting BCP to 1 inverts the polarity of BCLK to the inverse of that shown in Figure 14, Figure 15, Figure 16, Figure 17 and Figure 18. In DSD mode, DSDL and DSDR inputs are sampled a fixed delay after a falling 64fs clock edge. When BCP is set in DSD mode, DSDL and DSDR are sampled a fixed delay after a rising 64fs clock edge. REGISTER ADDRESS R5 Format Control 05h BIT 5 LABEL BCP DEFAULT 0 DESCRIPTION BCLK / DSD64CLK polarity select: 0 = normal polarity 1 = inverted polarity Table 19 BCLK Polarity Control OVERSAMPLING RATE CONTROL The user has control of the oversampling ratio of the WM8741, and can set to the device to operate in low, medium or high rate modes. For correct operation of the digital filtering and other processing on the WM8741, the user must ensure the correct value of OSR[1:0] is set at all times. REGISTER ADDRESS R7 Mode Control 1 07h BIT [6:5] LABEL OSR[1:0] DEFAULT 00 DESCRIPTION Oversampling Rate Selection 00 = Low rate (32/44.1/48kHz) 01 = Medium rate (96kHz) 10 = High rate (192kHz) 11 = Unused Table 20 Oversampling Rate Control w PP Rev 1.3 October 2007 30 Product Preview WM8741 MCLK/LRCLK RATIO CONTROL (NORMAL PCM MODE) The ratio of MCLK/LRCLK can be programmed directly or auto-detected. REGISTER ADDRESS R7 Mode Control 1 07h BIT [4:2] LABEL SR[3:0] DEFAULT 000 DESCRIPTION MCLK to LRCLK sampling rate ratio control (Normal PCM Mode): 000 = auto detect sample rate 001 = 128fs 010 = 192fs 011 = 256fs 100 = 384fs 101 = 512fs 110 = 768fs 111 = reserved Table 21 MCLK/LRCLK Ratio Control (Normal PCM Mode) 8FS MODE 8FS Mode allows the use of custom digital filters by bypassing the WM8741 internal digital filters. When MODE8X is set, the PCM data input to the WM8741 is applied only to the digital volume control and then the analogue section of the DAC system, bypassing the digital filters. REGISTER ADDRESS R7 Format Control 07h Table 22 8FS Mode Control BIT 7 LABEL MODE8X DEFAULT 0 DESCRIPTION 8FS mode select: 0 = Normal operation 1 = 8FS mode (digital filters bypassed) MCLK/LRCLK RATIO CONTROL (8FS MODE) In 8FS mode the choice of clock ratios and sampling rates is limited - see Table 12 for details. Autodetect of MCLK/LRCLK ratio is not available in 8FS mode and must be set manually by the user for correct operation. REGISTER ADDRESS R7 Mode Control 1 07h BIT [4:2] LABEL SR[2:0] DEFAULT 000 DESCRIPTION MCLK to LRCLK sampling rate ratio control (8FS Mode): 000 = reserved 001 = 512fs 010 = 768fs 011 to 111 = reserved Table 23 MCLK/LRCLK Ratio Control (8FS Mode) ATTENUATION CONTROL Each DAC channel can be attenuated digitally before being applied to the digital filter. Attenuation is set to 0dB by default but can be set between 0dB and -127.5dB in 0.125dB steps using the ten attenuation control bits LAT[4:0], LAT[9:5], RAT[4:0] and RAT[9:5]. All attenuation registers are double latched allowing new values to be pre-latched to both channels before being updated synchronously. Setting the UPDATE bit on any attenuation write will cause all pre-latched values to be immediately applied to the DAC channels. w PP Rev 1.3 October 2007 31 WM8741 REGISTER ADDRESS R0 DACLLSB Attenuation 00h BITS [4:0] 5 LABEL LAT[4:0] UPDATE DEFAULT 00 (0dB) 0 DESCRIPTION Product Preview LSBs of attenuation data for left channel in 0.125dB steps. See Table 25 for details. Attenuation data load control for left channel. 0 = Store LAT[4:0] value but don't update 1 = Store LAT[4:0] and update attenuation on registers 0-3 MSBs of attenuation data for left channel in 4dB steps. See Table 25 for details. Attenuation data load control for left channel. 0 = Store LAT[9:5] value but don't update 1 = Store LAT[9:5] and update attenuation on registers 0-3 LSBs of attenuation data for right channel in 0.125dB steps. See Table 25 for details. Attenuation data load control for right channel. 0 = Store RAT[4:0] value but don't update 1 = Store RAT[4:0] and update attenuation on registers 0-3 MSBs of attenuation data for right channel in 4dB step. See Table 25 for details. Attenuation data load control for right channel. 0 = Store RAT[9:5] value but don't update 1 = Store RAT[9:5] and update attenuation on registers 0-3 R1 DACLMSB Attenuation 01h [4:0] LAT[9:5] 00 (0dB) 5 UPDATE 0 R2 DACRLSB Attenuation 02h R3 DACRMSB Attenuation 03h [4:0] 5 RAT[4:0] UPDATE 00 (0dB) 0 [4:0] 5 RAT[9:5] UPDATE 00 (0dB) 0 Table 24 Attenuation Control Note: 1. The UPDATE bit is not latched. If UPDATE=0, the attenuation value will be written to the pre-latch but not applied to the relevant DAC. If UPDATE=1, all pre-latched values and the current value being written will be applied on the next input sample. DAC OUTPUT ATTENUATION Registers LAT[9:0] and RAT[9:0] control the left and right channel attenuation. Table 25 shows how the attenuation levels are configured by the 10-bit words. L/RAT[9:0] 000(hex) 001(hex) : : : 3FE(hex) 3FF(hex) ATTENUATION LEVEL 0dB -0.125dB : : : -127.75dB -dB (mute) Table 25 Attenuation Control Levels ATTENUATION CONTROL MODE Setting the ATC register bit causes the left channel attenuation settings to be applied to both left and right channel DACs from the next audio input sample. No update to the attenuation registers is required for ATC to take effect. Right channels register settings are preserved regardless of the status of ATC. REGISTER ADDRESS R4 Volume Control 04h BIT 2 LABEL ATC DEFAULT 0 DESCRIPTION Attenuator Control Mode: 0 = Right channels use Right attenuation 1 = Right Channels use Left Attenuation Table 26 Attenuator Control Mode w PP Rev 1.3 October 2007 32 Product Preview WM8741 VOLUME RAMP MODE There are two ways to change the volume in the WM8741, controlled by VOL_RAMP. When VOL_RAMP=0, the volume changes in a single step from the current volume setting to the new volume when an update is applied to the gain control registers. When VOL_RAMP=1, the volume is automatically ramped from the current volume setting to the new volume setting when an update is applied to the volume control registers. The speed at which this happens is dependant on the sample rate as shown in Table 27 below: SAMPLE RATE (kHz) 32 44.1 48 88.2 96 176.4 196 Table 27 Volume Ramp Rates REGISTER ADDRESS R4 Volume Control 04h BIT 0 LABEL VOL_ RAMP DEFAULT 0 DESCRIPTION Volume ramp mode control: 0 = Apply volume change in a single step. 1 = Ramp between current volume setting and new volume setting. RAMP RATE (ms/dB) 1.000 0.726 0.667 0.726 0.667 0.726 0.667 Table 28 Volume Ramp Control ANTI-CLIPPING DIGITAL ATTENUATION MODE Audio material is regularly recorded up to 0dB level and heavily compressed. This may cause clipping and occasional distortion when the digital media is applied to a DAC. In order to prevent this in the WM8741, an anti-clipping mode is provided, which attenuates the digital signal by 2dB as it is processed through the digital filters. REGISTER ADDRESS R4 Volume Control 04h BIT 1 LABEL ATT2DB DEFAULT 0 DESCRIPTION Anti-clipping mode control: 0 = Off, 0dB attenuation 1 = On, 2dB attenuation applied Table 29 Anti-Clipping Digital Attenuation Control DSD PLUS GAIN CONTROL The gain in the DSD Plus data path can be adjusted. differential output level. REGISTER ADDRESS R8 Mode Control 2 08h BIT 6 LABEL DSD_ GAIN DEFAULT 0 The default setting provides a 1.4Vrms DESCRIPTION DSD Plus gain control: 0 = Low gain, 1.4Vrms differential output level 1 = High gain, 2.0Vrms differential output level Table 30 DSD Plus Gain Control w PP Rev 1.3 October 2007 33 WM8741 MUTE MODES Product Preview 0.000 0.020 0.040 0.060 0.080 0.100 0.120 0.140 Time (s) Figure 24 Application and Release of Soft Mute Figure 24 shows the application and release of SOFTMUTE for a full amplitude sinusoid being played at 48kHz sampling rate. When SOFTMUTE (lower trace) is asserted, the WM8741 output (upper trace) begins to decay exponentially from the DC level of the last input sample. The output decays towards VMID in 1022x4/fs seconds. When SOFTMUTE is de-asserted, the signal gain will return to its previous value. REGISTER ADDRESS R4 PCM Control 04h Table 31 Soft Mute Control BIT 3 LABEL SOFTMUTE DEFAULT 0 DESCRIPTION Soft mute select 0 = Normal operation 1 = Soft mute both channels w PP Rev 1.3 October 2007 34 Product Preview WM8741 ZERO FLAG OUTPUT The WM8741 has one zero flag output pin, ZFLAG (pin 21). The zero flag feature is only valid for PCM data. The WM8741 asserts Logic 1 on the ZFLAG pin when a sequence of more than 1024 zeros is input to the chip. The default value is a logical AND of both left and right channels. Under software control, the user can also set the zero flag pin to respond to either the left channel OR the right channel. The zero flag pin can be used to control external muting circuits if required. REGISTER ADDRESS R4 Volume Control 04h BIT 6:5 LABEL ZEROFLR [1:0] DEFAULT 00 DESCRIPTION Zero flag output: 00 = Pin assigned to logical AND of LEFT and RIGHT channels 01 = Pin assigned to LEFT channel 10 = Pin assigned to RIGHT channel 11 = ZFLAG disabled Table 32 Zero Flag Output ZFLAG FORCE HIGH CONTROL It is possible to force the ZFLAG pin to Logic 1 by setting ZFLAG_HI=1 in R7. This is useful in situations where an application processor may require manual control of an external mute circuit. Setting ZFLAG_HI=0 will allow the ZFLAG pin to function as defined by ZFLAGLR[1:0]. REGISTER ADDRESS R6 Mode Control 1 06h BIT 7 LABEL ZFLAG_HI DEFAULT 0 DESCRIPTION ZFLAG Force High Control 0 = Normal operation 1 = Output Logic 1 Table 33 ZFLAG Force High Control INFINITE ZERO DETECT The IZD register configures the operation of the WM8741 analogue mute in conjunction with the zero flag feature. Table 20 shows the interdependency of the MUTEB pin, the IZD register and the zero flag. REGISTER ADDRESS R4 Volume Control 04h BIT 4 LABEL IZD DEFAULT 0 DESCRIPTION IZD control of analogue mute: 0 = Never analogue mute 1 = Analogue mute when ZFLAG set Table 20 Infinite Zero Detect Control w PP Rev 1.3 October 2007 35 WM8741 MUTEB ZFLAG Product Preview ZDET DINL DINR DAC SOFT L&R ANA L&R DSD Direct Infinite Zero Detect Figure 25 Software Control Mode MUTEB and ZFLAG Configuration DE-EMPHASIS Setting the DEEMPH[1:0] register bits enables de-emphasis support in the WM8741 digital filters. There are three de-emphasis filters, one each for sampling rates of 32kHz, 44.1kHz and 48kHz. REGISTER ADDRESS R6 Filter Control 06h BIT [6:5] LABEL DEEMPH [1:0] DEFAULT 00 DESCRIPTION De-emphasis mode select: 00 = De-emphasis Off 01 = De-emphasis 32kHz 10 = De-emphasis 44.1kHz 11 = De-emphasis 48kHz Table 34 De-emphasis Control OUTPUT PHASE REVERSAL The REV register bit controls the phase of the output signal. Setting the REV bit causes the phase of the output signal to be inverted. The REV bit can only be used in stereo mode. When in differential mono mode, the REV bit must remain set as 0. REGISTER ADDRESS R5 Format Control 05h BIT 6 LABEL REV DEFAULT 0 DESCRIPTION Analogue output phase control: 0 = Normal 1 = Inverted Table 35 Output Phase Control w PP Rev 1.3 October 2007 36 Product Preview WM8741 DIFFERENTIAL MONO MODE DIFF[1:0] sets the required differential output mode; normal stereo, reversed stereo, mono left or mono right, as shown in Table 36. REGISTER ADDRESS R8 Mode Control 2 08h BIT [3:2] LABEL DIFF[1:0] DEFAULT 00 DESCRIPTION 00 = Stereo 10 = Stereo reverse (left and right channels swapped) 01 = Mono left - differential outputs VOUTLP (17) is left channel. VOUTLN (16) is left channel inverted. VOUTRP (12) is left channel inverted. VOUTRN (13) is left channel. 11 = Mono right - differential outputs. VOUTLP (17) is right channel inverted. VOUTLN (16) is right channel. VOUTRP (12) is right channel. VOUTRN (13) is right channel inverted. Table 36 Differential Output Modes Using these controls a pair of WM8741 devices may be used to build a dual differential stereo implementation with higher performance and differential output. DITHER Dither is applied whenever internal truncation occurs. It is also used when a 32 bit input word is applied to the DAC prior to truncation to the internal wordlength. Three types of dither can be selected to allow the sound quality if the device to be optimised. TDF has a triangular probability density function and causes zero noise modulation i.e. the quantisation noise is invariant to the changes in the signal level. This mode is recommended and is selected by default. RPDF has a rectangular probability density function and may cause noise modulation. HPDF has a triangular probability density function with a high pass characteristic, which has a lower noise at low frequencies at the expense of raised noise levels at higher frequencies. Alternatively the dither can be disabled. REGISTER ADDRESS R8 Mode Control 2 08h BIT [1:0] LABEL DITHER [1:0] DEFAULT 10 DESCRIPTION Digital filter dither mode select: 00 = dither off 01 = RPDF dither applied in Digital filter 10 = TPDF dither applied in Digital filter 11 = HPDF dither applied in Digital filter Note: DITHER[1:0] applies only to the dither mode in the Digital filter. Table 37 Dither Control w PP Rev 1.3 October 2007 37 WM8741 NORMAL PCM MODE DIGITAL FILTER SELECTION Product Preview The 8741 has a number of advanced digital filters that can be selected in all PCM operation modes (with the exception of 8FS mode). REGISTER ADDRESS R6 Filter Control 06h BIT [2:0] LABEL FIRSEL DEFAULT 000 DESCRIPTION Selects FIR1 filter response 000 = Response 1 001 = Response 2 010 = Response 3 011 = Response 4 100 = Response 5 Table 38 PCM Advanced Digital Filter Selection Five digital filters are available for selection in each of the three OSR modes (low, medium and high rate) as selected by the OSR bit described in Table 20. It is recommended that the device is muted before the filter response is changed to prevent noise as the filters are reset from appearing on the outputs. For full details of the filter characteristics available in normal PCM mode, please see Table 61 to Table 63 and Figure 28 to Figure 57. 8FS MODE DIGITAL FILTER In 8FS mode, the majority of the internal filters are bypassed. In this mode, the data is filtered using only the filter characteristic described by Table 64 and shown in Figure 58 and Figure 59. DSD PLUS FILTER SELECTION The WM8741 has a number of compensation filters that can be selected in DSD Plus mode. REGISTER ADDRESS R6 Filter Control 06h BIT [4:3] LABEL DSDFILT [1:0] DEFAULT 00 DESCRIPTION Selects Compensation Filter response 00 = Response 1 01 = Response 2 10 = Response 3 11 = Response 4 Table 39 DSD Plus Digital Filter Selection It is recommended that the device is muted before the filter response is changed to prevent noise as the filters are reset from appearing on the outputs. Full details of these filters are described in Table 65 and Figure 60 to Figure 67. DSD DIRECT DIGITAL FILTER The DSD Direct filter has been designed to provide the minimal of processing to the data with no decimation, re-quantisation or noise-shaping, in order to preserve the signal integrity as much as possible. As a result the filter has a wide bandwidth and a very gradual attenuation. It is recommended that this filter is augmented by analogue post-DAC filtering in order to adhere to the Scarlet-Book SACD standard. w PP Rev 1.3 October 2007 38 Product Preview WM8741 DSD MUTE CONTROL In DSD Direct mode, an analogue mute can be applied at the output of the DAC. This is controlled by register bit AMUTE. REGISTER ADDRESS R4 Volume Control 04h BIT 7 LABEL AMUTE DEFAULT 0 DESCRIPTION DSD Direct mute control: 0 = mute off 1 = mute on Table 40 DSD Analogue Mute Control POWER SAVING STANDBY CONTROL Setting the PWDN register bit immediately connects all outputs to VMID and resets the digital sections of the DAC system including the DLL, the audio interface and the DSP. Input data samples are not preserved, but all control register settings are maintained. When PWDN is cleared the WM8741 will repeat its power-on initialisation sequence. REGISTER ADDRESS R5 Format Control 05h BIT 7 LABEL PWDN DEFAULT 0 DESCRIPTION Power Down Mode Select: 0 = Normal Mode 1 = Power Down Mode Table 41 Powerdown Control HARDWARE CONTROL MODE When the MODE pin is held `low' the WM8741 is set to hardware control mode and a limited feature set can be configured. PIN 24 NAME MODE/ LRSEL DESCRIPTION 0 = Hardware control mode 1 = 3-wire serial control mode Z = 2-wire serial control mode Table 42 MODE/LRSEL Hardware Control Pin Function DSD AND PCM MODE SWITCHING The audio interface mode can be switched between DSD Direct and PCM by controlling the state of pin DSD. It is recommended that the chip is forced into a MUTE state before dynamically switching modes. PIN 27 NAME SCLK/DSD DESCRIPTION 0 = PCM Mode 1 = DSD Direct Mode Table 43 SCLK/DSD Hardware Control Pin Function AUDIO INPUT FORMAT Under hardware control, it is possible to select between four different modes of operation for the PCM audio interface. PIN NUMBER NAME STATUS 28 CSB/SADDR/I2S 0 0 1 1 23 IWO/DOUT 0 1 0 1 DESCRIPTION 16-bit right justified 24-bit right justified 24-bit left justified 24-bit I2S Table 44 CSB/SADDR/I2S and IWO/DOUT Hardware Control Pin Function w PP Rev 1.3 October 2007 39 WM8741 OVERSAMPLING RATE CONTROL Product Preview The user has control of the oversampling ratio of the WM8741, and can set to the device to operate in low, medium or high rate modes. For optimum operation of the digital filtering and other processing on the WM8741, the user must ensure the correct value of OSR[1:0] is set at all times. PIN 25 NAME OSR/DSDR DESCRIPTION Oversampling Rate Selection 0 = Low rate (32/44.1/48kHz) Z = Medium rate (88.2/96kHz) 1 = High rate (176.4/192kHz) Table 45 OSR/DSDR Hardware Control Pin Function MUTE PIN A soft mute can be applied to the WM8741 in the digital domain in all PCM. A logic low on the MUTEB pin will cause the attenuation to ramp to infinite attenuation at a rate of 1022x(4/fs). Setting MUTEB high will return the signal gain to its previous value. Figure 26 shows the soft mute characteristic. In DSD Direct mode the MUTEB pin controls the analogue mute in the DAC. This analogue mute is a `hard' mute and is applied and released as soon as the MUTEB pin is toggled. PIN 25 NAME MUTEB/ SDOUT DESCRIPTION Mute control 0 = Mute on (no output) 1 = Mute off (normal operation Table 46 MUTEB Hardware Control Pin Function 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 Time (s) Figure 26 Hardware Control Mode Soft Mute Characteristic w PP Rev 1.3 October 2007 40 Product Preview WM8741 ZERO FLAG In hardware control mode the ZFLAG pin asserts when 1024 consecutive zero samples are applied to the left and right channels of the WM8741 when in PCM mode. In DSD mode, the ZFLAG has no function. In hardware mode there is no access to the infinite zero detect and so there is no automute function. If this functionality is required, software mode must be used. Figure 27 shows the MUTEB and ZFLAG configuration. Figure 27 Hardware Control Mode MUTEB & ZFLAG Configuration DE-EMPHASIS CONTROL AND ANTI-CLIPPING MODE In hardware control mode, de-emphasis is supported at a sampling rate of 44.1kHz. De-emphasis is supported at 32kHz and 48kHz sampling rates in software control mode. Audio material is regularly recorded up to 0dB level and heavily compressed. This causes clipping and distortion when the digital media is applied to a DAC. In order to prevent this in the WM8741, an anti-clipping mode is provided, which attenuates the digital signal by 2dB as it is processed through the digital filters. Under hardware control de-emphasis and the anti-clipping mode are only available when using PCM mode. PIN 26 NAME SDIN/ DEEMPH DESCRIPTION Deemphasis Control 0 = De-emphasis off 1 = 44.1kHz de-emphasis on Z = Digital filter anti-clipping mode Table 47 DEEMPH Hardware Control Pin Function w PP Rev 1.3 October 2007 41 WM8741 DIGITAL FILTER SELECTION Product Preview The WM8741 includes a wide range of digital filters. A limited set of these can be selected in hardware control mode as listed in Table 48. Full details of each digital filter response can be found in section PCM Digital Filter Selection, from page 38. PIN 4 NAME FSEL/ DINR DESCRIPTION Digital filter selection (32/44.1/48kHz): 0 = Response 1 1 = Response 4 Z = Response 5 Digital filter selection (88.2/96kHz and 176.4/192kHz): 0 = Response 3 1 = Response 1 Z = Response 2 Table 48 FSEL/DINR Hardware Control Pin Function There is no choice of digital filters in DSD Direct mode - only the very minimal filtering described in Table 66 is available. DIFFERENTIAL MONO MODE If DIFFHW (pin 6) is held to Logic 1, hardware controlled differential mono mode is selected. This overrides any other control pin or register bit. Differential mono mode allows the user to build a dual differential stereo DAC implementation with higher performance and differential output. DIFFHW is used in conjunction with MODE/LRSEL (pin 24) to define a `left' or `right' DAC as shown in Table 49. PIN NUMBER NAME 6 DIFFHW 0 0 0 1 24 MODE/LRSEL 0 Z 1 0 DESCRIPTION Hardware control (stereo) 2-wire Software Control 3-wire software control) Mono Left - differential outputs VOUTLP = left channel VOUTLN = left channel inverted VOUTRP = left channel inverted VOUTRN = left channel Mono right - differential outputs VOUTLP = right channel inverted VOUTLN = right channel VOUTRP = right channel VOUTRN = right channel inverted 1 1 Table 49 DIFFHW and MODE/LRSEL Hardware Control Pin Functions Differential mono mode is available for all PCM hardware controlled modes and DSD Direct hardware mode. w PP Rev 1.3 October 2007 42 Product Preview WM8741 OVERVIEW OF FUNCTIONS The WM8741 has many modes of operation, and certain restrictions on what functions are available in which modes. Table 50 gives an overview of the functions available in hardware and software control modes across all modes of operation: SOFTWARE MODE FUNCTION Selectable Digital Filters 44.1kHz Deemphasis 32/48kHz Deemphasis Adjustable DSP Dither Differential Mono Mode Digital Softmute Analogue Mute Zero Detect (ZFLAG) Automute Function Anti-Clipping Mode Digital Attenuation Powerdown Mode Audio Interface Daisy Chain 3-wire Software Interface Daisy Chain Table 50 Comparison of Functions Available across Operating Modes = function available = function not available NORMAL PCM 8FS MODE DSD PLUS DSD DIRECT HARDWARE MODE NORMAL PCM DSD DIRECT 5 4 3 w PP Rev 1.3 October 2007 43 WM8741 REGISTER MAP Reg 0 Name DACLLSB Attenuation DACLMSB Attenuation DACRLSB Attenuation DACRMSB Attenuation Volume Control Addr 00h Bit 8 0 Product Preview Bit 7 0 Bit 6 0 Bit 5 UPDATELL Bit 4 Bit 3 Bit 2 LAT[4:0] Bit 1 Bit 0 Default 0x000 1 01h 0 0 0 UPDATELM LAT[9:5] 0x000 2 02h 0 0 0 UPDATERL RAT[4:0] 0x000 3 03h 0 0 0 UPDATERM RAT[9:5] 0x000 4 04h SOFT 0 AMUTE ZEROFLR[1:0] IZD MUTE ATC ATT2DB VOL_RAMP 0x000 5 Format Control 05h 0 PWDN REV BCP LRP FMT[1:0] IWL[1:0] 0x00A 6 Filter Control 06h 0 ZFLAG_HI DEEMPH[1:0] DSDFILT[1:0] FIRSEL[2:0] 0x000 7 Mode Control 1 07h 0 MODE8X OSR[1:0] SR[2:0] MODESEL[1:0] 0x000 8 Mode Control 2 08h 0 0 DSD_GAIN SDOUT DOUT DIFF[1:0] DITHER[1:0] 0x002 9 Software Reset 09h RESET 0x000 w PP Rev 1.3 October 2007 44 Product Preview WM8741 BITS [4:0] 5 NAME LAT[4:0] UPDATE DEFAULT 00 (0dB) 0 DESCRIPTION LSBs of attenuation data for left channel in 0.125dB steps. See Table 25 for details. Attenuation data load control for left channel. 0 = Store LAT[4:0] value but don't update 1 = Store LAT[4:0] and update attenuation on registers 0-3 REGISTER ADDRESS R0 DACLLSB Attenuation 00h Table 51 R0 DACL LSB Attenuation Control Register REGISTER ADDRESS R1 DACLMSB Attenuation 01h BITS [4:0] 5 NAME LAT[9:5] UPDATE DEFAULT 00 (0dB) 0 DESCRIPTION MSBs of attenuation data for left channel in 4dB steps. See Table 25 for details. Attenuation data load control for left channel. 0 = Store LAT[9:5] value but don't update 1 = Store LAT[9:5] and update attenuation on registers 0-3 Table 52 R1 DACL MSB Attenuation Control Register REGISTER ADDRESS R2 DACRLSB Attenuation 02h BITS [4:0] 5 NAME RAT[4:0] UPDATE DEFAULT 00 (0dB) 0 DESCRIPTION LSBs of attenuation data for right channel in 0.125dB steps. See Table 25 for details. Attenuation data load control for right channel. 0 = Store RAT[4:0] value but don't update 1 = Store RAT[4:0] and update attenuation on registers 0-3 Table 53 R2 DACR LSB Attenuation Control Register REGISTER ADDRESS R3 DACRMSB Attenuation 03h BITS [4:0] 5 NAME RAT[9:5] UPDATE DEFAULT 00 (0dB) 0 DESCRIPTION MSBs of attenuation data for right channel in 4dB step. See Table 25 for details. Attenuation data load control for right channel. 0 = Store RAT[9:5] value but don't update 1 = Store RAT[9:5] and update attenuation on registers 0-3 Table 54 R3 DACR MSB Attenuation Control Register w PP Rev 1.3 October 2007 45 WM8741 REGISTER ADDRESS R4 Volume Control 04h BITS 0 NAME VOL_RAMP DEFAULT 0 DESCRIPTION Product Preview Ramps volume from existing attenuation setting to new setting when UPDATE applied. 0: Step volume change 1: Ramp volume change Anti-clipping mode control. Attenuates PCM gain path by 2 dB: 0: 0dB gain 1: -2dB gain Attenuator Control Mode: 0 = Right channels use Right attenuation 1 = Right Channels use Left Attenuation Soft mute select 0: Normal Operation 1: Soft mute both channels Enables infinite zero detect (detects 1024 zeros on input): 0 = Disable infinite zero detect 1 = Enable infinite zero detect Zero flag output: 00 = Pin assigned to logical AND of LEFT and RIGHT channels 01 = Pin assigned to LEFT channel 10 = Pin assigned to RIGHT channel 11 = ZFLAG disabled Applies analogue mute in DSD mode 0 = Normal operation 1 = Analogue mute applied 1 ATT2DB 0 2 ATC 0 3 SOFTMUTE 0 4 IZD 0 6:5 ZEROFLR [1:0] 00 7 AMUTE 0 Table 55 R4 Volume Control Register REGISTER ADDRESS R5 Format Control 05h BITS [1:0] NAME IWL[1:0] DEFAULT 10 DESCRIPTION Audio interface input word length. 00 = 16-bit 01 = 20-bit 10 = 24-bit 11 = 32-bit Audio data format select. 00 = right justified mode 01 = left justified mode 10 = I2S mode 11 = DSP mode Polarity select for LRCLK/DSP mode select. 0 = normal LRCLK polarity/DSP mode A 1 = inverted LRCLK polarity/DSP mode B BCLK / DSD64CLK polarity select: 0 = normal polarity 1 = inverted polarity Analogue output phase control: 0 = Normal 1 = Inverted Power Down Mode Select: 0 = Normal Mode 1 = Power Down Mode [3:2] FMT[1:0] 10 4 LRP 0 5 BCP 0 6 REV 0 7 PWDN 0 Table 56 R5 Format Control Register w PP Rev 1.3 October 2007 46 Product Preview REGISTER ADDRESS R6 Filter Control 06h BITS [2:0] NAME FIRSEL DEFAULT 000 DESCRIPTION Select advanced digital filter response: 000 = Response 1 001 = Response 2 010 = Response 3 011 = Response 4 100 = Response 5 Select DSD compensation filter response: 00 = Response 1 01 = Response 2 10 = Response 3 11 = Response 4 De-emphasis mode select: 00 = De-emphasis Off 01 = De-emphasis 32kHz 10 = De-emphasis 44.1kHz 11 = De-emphasis 48kHz ZFLAG Force High Control 0 = Normal operation 1 = Output Logic 1 WM8741 [4:3] DSDFILT 00 [6:5] DEEMPH [1:0] 00 7 ZFLAG_HI 0 Table 57 R6 Filter Control Register REGISTER ADDRESS R7 Mode Control 1 07h BITS [1:0] NAME MODESEL [1:0] DEFAULT 00 DESCRIPTION DSD/PCM mode select. 00 = PCM mode 01 = DSD Direct mode 10 = DSD Plus mode 11 = Unused MCLK to LRCLK sampling rate ratio control: 000 = auto detect sample rate 001 = 128fs 010 = 192fs 011 = 256fs 100 = 384fs 101 = 512fs 110 = 768fs Selects low, medium or high sample rate mode for filter selection (equivalent to OSR pin functionality in Hardware Mode) 00 = Low rate (32/44.1/48kHz) 01 = Medium rate (96kHz) 10 = High rate (192kHz) 11 = Unused 8FS mode select: 0 = Normal operation 1 = 8FS mode (digital filters bypassed) [4:2] SR[3:0] 000 [6:5] OSR[1:0] 00 7 MODE8X 0 Table 58 R7 Mode Control Register 1 w PP Rev 1.3 October 2007 47 WM8741 REGISTER ADDRESS R8 Mode Control 2 08h BITS [1:0] NAME DITHER[1:0] DEFAULT 10 DESCRIPTION Product Preview ALU dither mode select: 00 = dither off 01 = RPDF dither applied in ALU 10 = TPDF dither applied in ALU 11 = HPDF dither applied in ALU Note: DITHER[1:0] applies only to the dither mode in the ALU. 00 = Stereo 10 = Stereo reverse (left and right channels swapped) 01 = Mono left - differential outputs VOUTLP is left channel. VOUTLN is left channel inverted. VOUTRP is left channel inverted. VOUTRN is left channel. 11 = Mono right - differential outputs. VOUTLP is right channel inverted. VOUTLN is right channel. VOUTRP is right channel. VOUTRN is right channel inverted. [3:2] DIFF[1:0] 00 4 DOUT 0 Daisychaining Mode. Audio data output control: 0 = No audio data daisychaining 1 = Audio data output on pin 23 Daisychaining Mode. Control data output control: 0 = No control data daisychaining 1 = Control data output on pin 25 DSD Plus gain control: 0 = Low gain, 1.4Vrms differential output level 1 = High gain, 2.0Vrms differential output level 5 SDOUT 0 6 DSD_GAIN 0 Table 59 R8 Mode Control Register 2 REGISTER ADDRESS R9 Software reset 09h BITS [7:0] NAME RESET DEFAULT 00000000 DESCRIPTION Software reset. Writing to the register resets the entire chip, including the register map. Table 60 Software Reset Control Register w PP Rev 1.3 October 2007 48 Product Preview WM8741 DIGITAL FILTER CHARACTERISTICS PCM MODE FILTER CHARACTERISTICS PARAMETER Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Group Delay Low Rate (32/44.1/48kHz) PCM Filter Response 2 Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Fs/2 Group Delay Low Rate (32/44.1/48kHz) PCM Filter Response 3 Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Fs/2 Group Delay Low Rate (32/44.1/48kHz) PCM Filter Response 4 Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Fs/2 Group Delay Low Rate (32/44.1/48kHz) PCM Filter Response 5 Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Group Delay Table 61 Low Rate PCM Filter Characteristics Fs/2 0.500fs -111.8 -112.45 8 dB dB fs 0.500fs -110.4 -116.19 47 0.417fs 0.000041 dB dB dB fs 0.546fs -110.3 -6.43 7 0.417fs 0.000066 dB dB dB fs 0.522fs -111.1 -28.07 8 0.454fs 0.000058 dB dB dB fs 0.546fs -111.8 -6.02 43 0.408fs 0.000036 dB dB dB fs TEST CONDITIONS MIN TYP MAX 0.454fs 0.000057 dB UNIT Low Rate (32/44.1/48kHz) PCM Filter Response 1 0.000057dB 0.000036 dB 0.000058 dB 0.000066 dB 0.000041 dB w PP Rev 1.3 October 2007 49 WM8741 PARAMETER Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Fs/2 Group Delay Medium Rate (88.2/96kHz) PCM Filter Response 2 Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Fs/2 Group Delay Medium Rate (88.2/96kHz) PCM Filter Response 3 Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Fs/2 Group Delay Medium Rate (88.2/96kHz) PCM Filter Response 4 Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Fs/2 Group Delay Medium Rate (88.2/96kHz) PCM Filter Response 5 Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Group Delay Table 62 Medium Rate PCM Filter Characteristics Fs/2 0.458fs -122.5 -130.52 8 0.458fs -120.0 -126.82 9 0.208fs 0.000023 0.500fs -115.5 -116.89 48 0.208fs 0.000021 0.500fs -120.8 -127.96 9 0.417fs 0.000048 0.500fs -120.3 -120.41 17 0.208fs 0.000014 TEST CONDITIONS MIN TYP MAX 0.208fs 0.000021 Product Preview UNIT Medium Rate (88.2/96kHz) PCM Filter Response 1 0.000021 dB dB dB dB fs 0.000014 dB dB dB dB fs 0.000048 dB dB dB dB fs 0.000021 dB dB dB dB fs 0.000023 dB dB dB dB fs w PP Rev 1.3 October 2007 50 Product Preview WM8741 TEST CONDITIONS MIN TYP MAX 0.104fs 0.000010 0.500fs -120.0 Fs/2 -127.5 10 0.104fs 0.000031 0.500fs -120.0 Fs/2 -124.93 4 0.400fs 0.000873 0.500fs -110.1 Fs/2 -112.67 31 0.104fs 0.000015 0.400fs -120.0 Fs/2 -120.58 6 0.104fs 0.000001 0.400fs -122.8 Fs/2 -128.58 18 dB dB fs dB dB dB fs dB dB dB fs dB dB dB fs dB dB dB fs dB UNIT PARAMETER Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 High Rate (176.4/192kHz) PCM Filter Response 1 0.000010 dB Group Delay High Rate (176.4/192kHz) PCM Filter Response 2 Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Group Delay High Rate (176.4/192kHz) PCM Filter Response 3 Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Group Delay High Rate (176.4/192kHz) PCM Filter Response 4 Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Group Delay High Rate (176.4/192kHz) PCM Filter Response 5 Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Group Delay Table 63 High Rate PCM Filter Characteristics 0.000031 dB 0.000873 dB 0.000015 dB 0.000001 dB 8FS MODE FILTER CHARACTERISTICS PARAMETER 8FS Mode Filter Passband Passband Ripple Filter Cut-off Group Delay Table 64 8FS Mode Filter Characteristics -3dB point 121.13 5 TEST CONDITIONS MIN TYP MAX 0.455 0.000021 UNIT fs dB kHz fs 0.000021 dB w PP Rev 1.3 October 2007 51 WM8741 DSD PLUS MODE FILTER CHARACTERISTICS PARAMETER Passband Passband Ripple Stopband Stopband Attenuation Filter Cut-off Group Delay DSD Plus Filter Response 2 Passband Passband Ripple Stopband Stopband Attenuation Filter Cut-off Group Delay DSD Plus Filter Response 3 Passband Passband Ripple Stopband Stopband Attenuation Filter Cut-off Group Delay DSD Plus Filter Response 4 Passband Passband Ripple Stopband Stopband Attenuation Filter Cut-off Group Delay Table 65 DSD Plus Filter Characteristics -3dB point 70.14 -26.28 49.74 46 -3dB point 70.03 -48.05 49.78 127 27.35 0.019762 -3dB point 120.41 -44.52 49.83 127 20.24 0.004140 -3dB point 127.69 -38.51 58.91 71 23.04 0.011308 TEST CONDITIONS MIN TYP MAX 22.48 0.020423 Product Preview UNIT kHz dB kHz dB kHz fs kHz dB kHz dB kHz fs kHz dB kHz dB kHz fs kHz dB kHz dB kHz fs DSD Plus Filter Response 1 0.020423 dB 0.011308dB 0.004140 dB 0.019762 dB DSD DIRECT MODE FILTER CHARACTERISTICS PARAMETER Passband Passband Ripple Stopband Stopband Attenuation Filter Cut-off Group Delay Table 66 DSD Direct Filter Characteristics -3dB point 116.45 -13.82 83.72 9 TEST CONDITIONS MIN TYP MAX 20.07 0.006714 UNIT kHz dB kHz dB kHz fs DSD Direct Filter (Low Gain Mode) 0.006714 dB w PP Rev 1.3 October 2007 52 Product Preview WM8741 PCM MODE FILTER RESPONSES 0 0.1 0.08 0.06 Response (dB x 10-3) 0 0.5 1 1.5 2 2.5 Frequency (fs) 3 3.5 4 -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -100 -150 -200 -0.1 0 0.1 0.2 0.3 Frequency (fs) 0.4 0.5 Figure 28 Low Rate PCM Filter 1 Frequency Response Figure 29 Low Rate PCM Filter 1 Ripple 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -100 -150 -200 0 0.5 1 1.5 2 2.5 Frequency (fs) 3 3.5 4 -0.1 0 0.1 0.2 0.3 Frequency (fs) 0.4 0.5 Figure 30 Low Rate PCM Filter 2 Frequency Response Figure 31 Low Rate PCM Filter 2 Ripple 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -100 -150 -200 0 0.5 1 1.5 2 2.5 Frequency (fs) 3 3.5 4 -0.1 0 0.1 0.2 0.3 Frequency (fs) 0.4 0.5 Figure 32 Low Rate PCM Filter 3 Frequency Response Figure 33 Low Rate PCM Filter 3 Ripple w PP Rev 1.3 October 2007 53 WM8741 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -200 0 0.5 1 1.5 2 2.5 Frequency (fs) 3 3.5 4 -0.1 0 0.1 0.2 0.3 Frequency (fs) Product Preview -100 -150 0.4 0.5 Figure 34 Low Rate PCM Filter 4 Frequency Response Figure 35 Low Rate PCM Filter 4 Ripple 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -100 -150 -200 0 0.5 1 1.5 2 2.5 Frequency (fs) 3 3.5 4 -0.1 0 0.1 0.2 0.3 Frequency (fs) 0.4 0.5 Figure 36 Low Rate PCM Filter 5 Frequency Response Figure 37 Low Rate PCM Filter 5 Ripple 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -100 -150 -200 0 0.5 1 Frequency (fs) 1.5 2 -0.1 0 0.05 0.1 0.15 Frequency (fs) 0.2 0.25 Figure 38 Medium Rate PCM Filter 1 Frequency Response Figure 39 Medium Rate PCM Filter 1 Ripple w PP Rev 1.3 October 2007 54 Product Preview 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -200 0 0.5 1 Frequency (fs) 1.5 2 -0.1 0 0.05 0.1 0.15 Frequency (fs) WM8741 -100 -150 0.2 0.25 Figure 40 Medium Rate PCM Filter 2 Frequency Response Figure 41 Medium Rate PCM Filter 2 Ripple 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -100 -150 -200 0 0.5 1 Frequency (fs) 1.5 2 -0.1 0 0.05 0.1 0.15 Frequency (fs) 0.2 0.25 Figure 42 Medium Rate PCM Filter 3 Frequency Response Figure 43 Medium Rate PCM Filter 3 Ripple 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -100 -150 -200 0 0.5 1 Frequency (fs) 1.5 2 -0.1 0 0.05 0.1 0.15 Frequency (fs) 0.2 0.25 Figure 44 Medium Rate PCM Filter 4 Frequency Response Figure 45 Medium Rate PCM Filter 4 Ripple w PP Rev 1.3 October 2007 55 WM8741 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -200 0 0.5 1 Frequency (fs) 1.5 2 -0.1 0 0.05 0.1 0.15 Frequency (fs) Product Preview -100 -150 0.2 0.25 Figure 46 Medium Rate PCM Filter 5 Frequency Response Figure 47 Medium Rate PCM Filter 5 Ripple 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -100 -150 -200 0 0.2 0.4 0.6 Frequency (fs) 0.8 1 -0.1 0 0.025 0.05 0.075 Frequency (fs) 0.1 0.125 0.15 Figure 48 High Rate PCM Filter 1 Frequency Response Figure 49 High Rate PCM Filter 1 Ripple 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -100 -150 -200 0 0.2 0.4 0.6 Frequency (fs) 0.8 1 -0.1 0 0.025 0.05 0.075 Frequency (fs) 0.1 0.125 0.15 Figure 50 High Rate PCM Filter 2 Frequency Response Figure 51 High Rate PCM Filter 2 Ripple w PP Rev 1.3 October 2007 56 Product Preview 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -200 0 0.2 0.4 0.6 Frequency (fs) 0.8 1 -0.1 0 0.025 0.05 0.075 Frequency (fs) 0.1 WM8741 -100 -150 0.125 0.15 Figure 52 High Rate PCM Filter 3 Frequency Response Figure 53 High Rate PCM Filter 3 Ripple 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -100 -150 -200 0 0.2 0.4 0.6 Frequency (fs) 0.8 1 -0.1 0 0.025 0.05 0.075 Frequency (fs) 0.1 0.125 0.15 Figure 54 High Rate PCM Filter 4 Frequency Response Figure 55 High Rate PCM Filter 4 Ripple 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -100 -150 -200 0 0.2 0.4 0.6 Frequency (fs) 0.8 1 -0.1 0 0.025 0.05 0.075 Frequency (fs) 0.1 0.125 0.15 Figure 56 High Rate PCM Filter 5 Frequency Response Figure 57 High Rate PCM Filter 5 Ripple w PP Rev 1.3 October 2007 57 WM8741 8FS MODE FILTER RESPONSES 0 0.1 0.08 0.06 Response (dB x 10-3) -50 Response (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -200 0 0.5 1 1.5 2 2.5 Frequency (fs) 3 3.5 4 -0.1 0 0.1 0.2 0.3 Frequency (fs) Product Preview -100 -150 0.4 0.5 Figure 58 8FS Mode Filter Frequency Response Figure 59 8FS Mode Filter Ripple DSD PLUS MODE FILTER RESPONSES 15 0 10 Response (dB x 10-3) -20 Response (dB) 5 0 -5 -10 -15 0 50 100 Frequency (kHz) 150 200 0 5 10 15 Frequency (kHz) 20 25 -40 -60 -80 -100 Figure 60 DSD Plus Mode Filter 1 Frequency Response Figure 61 DSD Plus Mode Filter 1 Ripple 15 0 10 Response (dB x 10-3) -20 Response (dB) 5 0 -5 -10 -15 0 50 100 Frequency (kHz) 150 200 0 5 10 15 Frequency (kHz) 20 25 -40 -60 -80 -100 Figure 62 DSD Plus Mode Filter 2 Frequency Response Figure 63 DSD Plus Mode Filter 2 Ripple w PP Rev 1.3 October 2007 58 Product Preview 15 0 10 Response (dB x 10-3) -20 Response (dB) 5 0 -5 -10 -15 0 50 100 Frequency (kHz) 150 200 0 5 10 15 Frequency (kHz) WM8741 -40 -60 -80 -100 20 25 Figure 64 DSD Plus Mode Filter 3 Frequency Response Figure 65 DSD Plus Mode Filter 3 Ripple 15 0 10 Response (dB x 10-3) -20 Response (dB) 5 0 -5 -10 -15 0 50 100 Frequency (kHz) 150 200 0 5 10 15 Frequency (kHz) 20 25 -40 -60 -80 -100 Figure 66 DSD Plus Mode Filter 4 Frequency Response Figure 67 DSD Plus Mode Filter 4 Ripple DSD DIRECT MODE FILTER RESPONSES 15 0 10 Response (dB x 10-3) -20 Response (dB) 5 0 -5 -10 -15 0 50 100 Frequency (kHz) 150 200 0 5 10 15 Frequency (kHz) 20 25 -40 -60 -80 -100 Figure 68 DSD Direct Mode Filter Frequency Response Figure 69 DSD Direct Mode Filter Ripple (Normalised) w PP Rev 1.3 October 2007 59 WM8741 DEEMPHASIS FILTER RESPONSES 0.0 Response (dB) Response (dB) -2.0 -4.0 -6.0 -8.0 -10.0 0 5000 10000 Frequency (Hz) Figure 70 De-emphasis frequency response (32kHz) Product Preview 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 0 5000 10000 Frequency (Hz) 15000 20000 15000 20000 Figure 71 De-emphasis error (32kHz) 0.0 Response (dB) Response (dB) 0 5000 10000 Frequency (Hz) Figure 72 De-emphasis frequency response (44.1kHz) -2.0 -4.0 -6.0 -8.0 -10.0 15000 20000 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 0 5000 10000 Frequency (Hz) 15000 20000 Figure 73 De-emphasis error (44.1kHz) 0.0 Response (dB) 0 5000 10000 Frequency (Hz) Figure 74 De-emphasis frequency response (48kHz) Response (dB) -2.0 -4.0 -6.0 -8.0 -10.0 15000 20000 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 0 5000 10000 Frequency (Hz) 15000 20000 Figure 75 De-emphasis error (48kHz) w PP Rev 1.3 October 2007 60 Product Preview WM8741 APPLICATIONS INFORMATION Figure 76 External Components Figure 77 External Filter Components w PP Rev 1.3 October 2007 61 WM8741 PACKAGE DIMENSIONS DS: 28 PIN SSOP (10.2 x 5.3 x 1.75 mm) Product Preview DM007.E b 28 e 15 E1 E 1 D 14 GAUGE PLANE c A A2 A1 -C0.10 C SEATING PLANE L 0.25 L1 Symbols A A1 A2 b c D e E E1 L L1 REF: MIN ----0.05 1.65 0.22 0.09 9.90 7.40 5.00 0.55 0 o Dimensions (mm) NOM --------1.75 0.30 ----10.20 0.65 BSC 7.80 5.30 0.75 1.25 REF o 4 JEDEC.95, MO-150 MAX 2.0 0.25 1.85 0.38 0.25 10.50 8.20 5.60 0.95 8 o NOTES: A. ALL LINEAR DIMENSIONS ARE IN MILLIMETERS. B. THIS DRAWING IS SUBJECT TO CHANGE WITHOUT NOTICE. C. BODY DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSION, NOT TO EXCEED 0.20MM. D. MEETS JEDEC.95 MO-150, VARIATION = AH. REFER TO THIS SPECIFICATION FOR FURTHER DETAILS. w PP Rev 1.3 October 2007 62 Product Preview WM8741 IMPORTANT NOTICE Wolfson Microelectronics plc ("Wolfson") products and services are sold subject to Wolfson's terms and conditions of sale, delivery and payment supplied at the time of order acknowledgement. Wolfson warrants performance of its products to the specifications in effect at the date of shipment. Wolfson reserves the right to make changes to its products and specifications or to discontinue any product or service without notice. Customers should therefore obtain the latest version of relevant information from Wolfson to verify that the information is current. Testing and other quality control techniques are utilised to the extent Wolfson deems necessary to support its warranty. Specific testing of all parameters of each device is not necessarily performed unless required by law or regulation. In order to minimise risks associated with customer applications, the customer must use adequate design and operating safeguards to minimise inherent or procedural hazards. Wolfson is not liable for applications assistance or customer product design. The customer is solely responsible for its selection and use of Wolfson products. Wolfson is not liable for such selection or use nor for use of any circuitry other than circuitry entirely embodied in a Wolfson product. Wolfson's products are not intended for use in life support systems, appliances, nuclear systems or systems where malfunction can reasonably be expected to result in personal injury, death or severe property or environmental damage. Any use of products by the customer for such purposes is at the customer's own risk. Wolfson does not grant any licence (express or implied) under any patent right, copyright, mask work right or other intellectual property right of Wolfson covering or relating to any combination, machine, or process in which its products or services might be or are used. Any provision or publication of any third party's products or services does not constitute Wolfson's approval, licence, warranty or endorsement thereof. Any third party trade marks contained in this document belong to the respective third party owner. Reproduction of information from Wolfson datasheets is permissible only if reproduction is without alteration and is accompanied by all associated copyright, proprietary and other notices (including this notice) and conditions. Wolfson is not liable for any unauthorised alteration of such information or for any reliance placed thereon. Any representations made, warranties given, and/or liabilities accepted by any person which differ from those contained in this datasheet or in Wolfson's standard terms and conditions of sale, delivery and payment are made, given and/or accepted at that person's own risk. Wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person. ADDRESS: Wolfson Microelectronics plc Westfield House 26 Westfield Road Edinburgh EH11 2QB Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: sales@wolfsonmicro.com w PP Rev 1.3 October 2007 63 |
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