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CS5340 101 dB, 192 kHz, Multi-Bit Audio A/D Converter
Features
Advanced multi-bit Delta-Sigma architecture 24-bit conversion Supports all audio sample rates including 192 kHz 101 dB Dynamic Range at 5V -94 dB THD+N High pass filter to remove DC offsets Analog/digital core supplies from 3.3V to 5V Supports logic levels between 2.5V and 5V Linear phase digital anti-alias filtering Auto-mode selection Pin compatible with the CS5341
General Description
The CS5340 is a complete analog-to-digital converter for digital audio systems. It performs sampling, analog-todigital conversion and anti-alias filtering, generating 24-bit values for both left and right inputs in serial form at sample rates up to 200 kHz per channel. The CS5340 uses a 5th-order, multi-bit Delta-Sigma modulator followed by digital filtering and decimation, which removes the need for an external anti-alias filter. The CS5340 is ideal for audio systems requiring wide dynamic range, negligible distortion and low noise, such as set-top boxes, DVD-karaoke players, DVD recorders, A/V receivers, and automotive applications. ORDERING INFORMATION CS5340-CZ -10 to 70 C 16-pin TSSOP CDB5340 Evaluation Board
VQ
REFGND
VL 2.5V - 5.0V SCLK LRCK SDOUT
MCLK
FILT+
Voltage Reference
Serial Output Interface
RST M0 M1
AINL S/H
+ -
LP Filter
Q
Digital Decimation Filter
High Pass Filter
DAC AINR S/H DAC + LP Filter Q Digital Decimation Filter High Pass Filter
VA 3.3V - 5.0V
GND
VD 3.3V - 5.0V
Advance Product Information
www.cirrus.com
This document contains information for a new product. Cirrus Logic reserves the right to modify this product without notice.
Copyright Cirrus Logic, Inc. 2003 (All Rights Reserved)
(c)
FEB `03 DS601A1 1
CS5340
TABLE OF CONTENTS
1 CHARACTERISTICS AND SPECIFICATIONS ......................................................................... 4 SPECIFIED OPERATING CONDITIONS ................................................................................. 4 ABSOLUTE MAXIMUM RATINGS ........................................................................................... 4 ANALOG CHARACTERISTICS (CS5340-CZ).......................................................................... 5 DIGITAL FILTER CHARACTERISTICS.................................................................................... 7 DC ELECTRICAL CHARACTERISTICS................................................................................. 10 DIGITAL CHARACTERISTICS ............................................................................................... 10 THERMAL CHARACTERISTICS............................................................................................ 10 SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT ................................................. 11 2 PIN DESCRIPTION ................................................................................................................. 13 3 TYPICAL CONNECTION DIAGRAM ....................................................................................... 14 4 APPLICATIONS ....................................................................................................................... 15 4.1 Single, Double, and Quad Speed Modes ......................................................................... 15 4.2 Operation as Either a Clock Master or Slave ................................................................... 15 4.3 Serial Audio Interface ....................................................................................................... 17 4.4 Power-up Sequence ........................................................................................................ 18 4.5 Analog Connections ......................................................................................................... 18 4.6 Grounding and Power Supply Decoupling ....................................................................... 19 4.7 Synchronization of Multiple Devices ................................................................................ 19 5 PARAMETER DEFINITIONS ................................................................................................... 20 6 PACKAGE DIMENSIONS ....................................................................................................... 21
Contacting Cirrus Logic Support
For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find one nearest you go to www.cirrus.com/
IMPORTANT NOTICE "Preliminary" product information describes products that are in production, but for which full characterization data is not yet available. "Advance" product information describes products that are in development and subject to development changes. Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other parts of Cirrus. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. An export permit needs to be obtained from the competent authorities of the Japanese Government if any of the products or technologies described in this material and controlled under the "Foreign Exchange and Foreign Trade Law" is to be exported or taken out of Japan. An export license and/or quota needs to be obtained from the competent authorities of the Chinese Government if any of the products or technologies described in this material is subject to the PRC Foreign Trade Law and is to be exported or taken out of the PRC. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK. Cirrus Logic, Cirrus and the Cirrus Logic logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners.
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CS5340
LIST OF FIGURES
Figure 1. Single Speed Mode Stopband Rejection ......................................................................... 8 Figure 2. Single Speed Mode Stopband Rejection ......................................................................... 8 Figure 3. Single Speed Mode Transition Band (Detail)................................................................... 8 Figure 4. Single Speed Mode Passband Ripple ............................................................................. 8 Figure 5. Double Speed Mode Stopband Rejection........................................................................ 8 Figure 6. Double Speed Mode Stopband Rejection........................................................................ 8 Figure 7. Double Speed Mode Transition Band (Detail) ................................................................. 9 Figure 8. Double Speed Mode Passband Ripple ............................................................................ 9 Figure 9. Quad Speed Mode Stopband Rejection .......................................................................... 9 Figure 10. Quad Speed Mode Stopband Rejection ........................................................................ 9 Figure 11. Quad Speed Mode Transition Band (Detail) .................................................................. 9 Figure 12. Quad Speed Mode Passband Ripple............................................................................. 9 Figure 13. Master Mode, Left Justified SAI ................................................................................... 12 Figure 14. Slave Mode, Left Justified SAI ..................................................................................... 12 Figure 15. Master Mode, I2S SAI .................................................................................................. 12 Figure 16. Slave Mode, I2S SAI .................................................................................................... 12 Figure 17. Typical Connection Diagram........................................................................................ 14 Figure 18. CS5340 Master Mode Clocking ................................................................................... 16 Figure 19. Left-Justified Serial Audio Interface ............................................................................. 18 Figure 20. I2S Serial Audio Interface............................................................................................. 18 Figure 21. CS5340 Recommended Analog Input Buffer............................................................... 19
LIST OF TABLES
Table 1. CS5340 Mode Control..................................................................................................... 15 Table 2. CS5340 Auto-Detect ....................................................................................................... 16 Table 3. Master Clock (MCLK) Ratios........................................................................................... 17 Table 4. Master Clock (MCLK) Frequencies for Standard Audio Sample Rates .......................... 17
3
CS5340
1 CHARACTERISTICS AND SPECIFICATIONS
(All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical performance characteristics and specifications are derived from measurements taken at typical supply voltages and TA = 25C.)
SPECIFIED OPERATING CONDITIONS
(GND = 0 V, all voltages with respect to 0 V.) Parameter Power Supplies Analog Digital Logic Commercial (-CZ) Symbol VA VD VL TAC Min 3.1 3.1 2.35 -10 Typ (Note 1) 3.3 3.3 Max 5.25 5.25 5.25 70 Unit V V V C
Ambient Operating Temperature
Notes: 1. This part is specified at typical analog voltages of 3.3 V and 5.0 V. See Analog Characteristics (CS5340CZ), below, for details.
ABSOLUTE MAXIMUM RATINGS
(GND = 0V, All voltages with respect to ground.) (Note 4) Parameter DC Power Supplies: Analog Logic Digital (Note 2) (Note 3) (Note 3) Symbol VA VL VD Iin VIN VIND TA Tstg Min -0.3 -0.3 -0.3 GND-0.7 -0.7 -50 -65 Max +6.0 +6.0 +6.0 10 VA+0.7 VL+0.7 +95 +150 Units V V V mA V V C C
Input Current Analog Input Voltage Digital Input Voltage Ambient Operating Temperature (Power Applied) Storage Temperature
Notes: 2. Any pin except supplies. Transient currents of up to 100 mA on the analog input pins will not cause SRC latch-up. 3. The maximum over/under voltage is limited by the input current. 4. Operation beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes.
4
CS5340
ANALOG CHARACTERISTICS (CS5340-CZ) Test conditions (unless otherwise specified):
Input test signal is a 1 kHz sine wave; measurement bandwidth is 10 Hz to 20 kHz. Parameter VA = 3.3 V Single Speed Mode Fs = 48 kHz Dynamic Range A-weighted unweighted Total Harmonic Distortion + Noise (Note 5) -1 dB -20 dB -60 dB Double Speed Mode Fs = 96 kHz Dynamic Range A-weighted unweighted 40 kHz bandwidth unweighted Total Harmonic Distortion + Noise (Note 5) -1 dB -20 dB -60 dB 40 kHz bandwidth -1 dB Quad Speed Mode Fs = 192 kHz Dynamic Range A-weighted unweighted 40 kHz bandwidth unweighted Total Harmonic Distortion + Noise (Note 5) -1 dB -20 dB -60 dB 40 kHz bandwidth -1 dB VA = 5.0 V Single Speed Mode Fs = 48 kHz Dynamic Range A-weighted unweighted Total Harmonic Distortion + Noise (Note 5) -1 dB -20 dB -60 dB Double Speed Mode Fs = 96 kHz Dynamic Range A-weighted unweighted 40 kHz bandwidth unweighted (Note 5) -1 dB -20 dB -60 dB 40 kHz bandwidth -1 dB Quad Speed Mode Fs = 192 kHz Total Harmonic Distortion + Noise Symbol Min Typ Max Unit
92 89 THD+N 92 89 THD+N 92 89 THD+N -
98 95 -91 -75 -35 98 95 92 -91 -75 -35 -85 98 95 92 -91 -75 -35 -85
-85 -85 -85 -
dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB
95 92 THD+N 95 92 THD+N -
101 98 -94 -78 -38 101 98 95 -94 -78 -38 -91
-88 -88 -
dB dB dB dB dB dB dB dB dB dB dB dB
5
CS5340
A-weighted unweighted 40 kHz bandwidth unweighted Total Harmonic Distortion + Noise (Note 5) -1 dB -20 dB -60 dB 40 kHz bandwidth -1 dB Dynamic Performance for All Modes Interchannel Isolation Interchannel Phase Deviation DC Accuracy Interchannel Gain Mismatch Gain Error Gain Drift Analog Input Characteristics Full-scale Input Voltage Input Impedance Note: 5. Referred to the typical full-scale input voltage Dynamic Range 95 92 THD+N 0.53*VA 18 -94 -78 -38 -91 70 0.0001 0.1 -88 dB dB dB dB dB Degree dB % ppm/C Vpp k 101 98 95 dB dB dB
100
0.56*VA -
5
0.59*VA -
6
CS5340
DIGITAL FILTER CHARACTERISTICS
Parameter Single Speed Mode (2 kHz to 50 kHz sample rates) Passband Passband Ripple Stopband Stopband Attenuation Total Group Delay (Fs = Output Sample Rate) Group Delay Variation vs. Frequency Double Speed Mode (50 kHz to 100 kHz sample rates) Passband Passband Ripple Stopband Stopband Attenuation Total Group Delay (Fs = Output Sample Rate) Group Delay Variation vs. Frequency Quad Speed Mode (100 kHz to 200 kHz sample rates) Passband Passband Ripple Stopband Stopband Attenuation Total Group Delay (Fs = Output Sample Rate) Group Delay Variation vs. Frequency High Pass Filter Characteristics Frequency Response Phase Deviation Passband Ripple Note: -3.0 dB -0.13 dB @ 20Hz (Note 6) (Note 6) 1 20 10 0 Hz Hz Deg dB tgd tgd (-0.1 dB) 0 96 60 5/Fs 50 0.025 0.0 kHz dB kHz dB s s tgd tgd (-0.1 dB) 0 53.8 69 9/Fs 47 0.025 0.0 kHz dB kHz dB s s tgd tgd (-0.1 dB) 0 27.3 70 12/Fs 23.5 0.035 0.0 kHz dB kHz dB s s Symbol Min Typ Max Unit
6. Response shown is for Fs equal to 48 kHz. Filter characteristics scale with Fs.
7
CS5340
0 -10 -20 -30 0 -10 -20 -30
Amplitude (dB)
-40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Amplitude (dB)
-40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0.40 0.42 0.44 0.46 0.48 0.50 0.52 0.54 0.56 0.58 0.60
Frequency (norm alized to Fs)
Frequency (norm alized to Fs)
Figure 1. Single Speed Mode Stopband Rejection
Figure 2. Single Speed Mode Stopband Rejection
0 -1 -2
0.10 0.08 0.06
Amplitude (dB)
Amplitude (dB)
-3 -4 -5 -6 -7 -8 -9 -10 0.45 0.46 0.47 0.48 0.49 0.5 0.51 0.52 0.53 0.54 0.55
0.04 0.02 0.00 -0.02 -0.04 -0.06 -0.08 -0.10 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Frequency (norm alized to Fs)
Frequency (norm alized to Fs)
Figure 3. Single Speed Mode Transition Band (Detail)
Figure 4. Single Speed Mode Passband Ripple
0 -10 -20 -30
0 -10 -20 -30
Amplitude (dB)
-80 -90 -100 -110 -120 -130 -140 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Amplitude (dB)
-40 -50 -60 -70
-40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0.40 0.42 0.44 0.46 0.48 0.50 0.52 0.54 0.56 0.58 0.60
Frequency (norm alized to Fs)
Frequency (norm alized to Fs)
Figure 5. Double Speed Mode Stopband Rejection
Figure 6. Double Speed Mode Stopband Rejection
8
CS5340
0 -1 -2
0.10 0.08 0.06
Amplitude (dB)
-3 -4 -5 -6 -7 -8 -9 -10 0.46 0.47 0.48 0.49 0.50 0.51 0.52
Amplitude (dB)
0.04 0.02 0.00 -0.02 -0.04 -0.06 -0.08 -0.10 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
Frequency (norm alized to Fs)
Frequency (norm alized to Fs)
Figure 7. Double Speed Mode Transition Band (Detail)
Figure 8. Double Speed Mode Passband Ripple
0 -10 -20 -30
0 -10 -20 -30
Amplitude (dB)
-80 -90 -100 -110 -120 -130 -140 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Amplitude (dB) Frequency (norm alized to Fs)
-40 -50 -60 -70
-40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140
0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85
Frequency (norm alized to Fs)
Figure 9. Quad Speed Mode Stopband Rejection
Figure 10. Quad Speed Mode Stopband Rejection
0 -1 -2 0.10 0.08 0.06
Amplitude (dB)
-3
Amplitude (dB)
0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
-4 -5 -6 -7 -8 -9 -10 0.10
0.04 0.02 0.00 -0.02 -0.04 -0.06 -0.08
Frequency (norm alized to Fs)
-0.10 0.00 0.03 0.05 0.08 0.10 0.13 0.15 0.18 0.20 0.23 0.25 0.28
Frequency (norm alized to Fs)
Figure 11. Quad Speed Mode Transition Band (Detail)
Figure 12. Quad Speed Mode Passband Ripple
9
CS5340
DC ELECTRICAL CHARACTERISTICS (GND = 0 V, all voltages with respect to 0V.
MCLK=12.288 MHz; Master Mode) Parameter DC Power Supplies: Positive Analog Positive Digital Positive Logic VA = 5 VA = 3.3 VL,VD = 5 VL,VD = 3.3 V V V V Symbol VA VD VL IA IA ID ID IA ID PSRR Min 3.1 3.1 2.35 Typ 21 18.2 15 9 1.5 0.4 180 90 9.5 65 VA/2 100 VA 18 0.01 Max 5.25 5.25 5.25 23.1 20 16.5 10 198 100 Unit V V V mA mA mA mA mA mA mW mW mW dB V
Power Supply Current (Normal Operation)
Power Supply Current (Power-Down Mode) (Note 7) Power Consumption (Normal Operation) Power Supply Rejection Ratio VQ Nominal Voltage Output Impedance
VA = 5 V VL,VD=5 V VL, VD, VA = 5 V VL, VD, VA = 3.3 V (Power-Down Mode) (1 kHz) (Note 8)
V
Filt+ Nominal Voltage Output Impedance Maximum allowable DC current source/sink
k
mA
Notes: 7. Power Down Mode is defined as RST = Low with all clocks and data lines held static. 8. Valid with the recommended capacitor values on FILT+ and VQ as shown in the Typical Connection Diagram.
DIGITAL CHARACTERISTICS
Parameter High-Level Input Voltage Low-Level Input Voltage High-Level Output Voltage at Io = 100 A Low-Level Output Voltage at Io =100 A Input Leakage Current (% of VL) (% of VL) (% of VL) (% of VL) Symbol VIH VIL VOH VOL Iin Min 70% 70% Typ Max 30% 15% 10 Units V V V V A
THERMAL CHARACTERISTICS
Parameter Allowable Junction Temperature Junction to Ambient Thermal Impedance Ambient Operating Temperature (Power Applied) Symbol Min -10 Typ 75 Max 135 +70 Unit C C/W C
JA
TA
10
CS5340
SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT (Logic "0" = GND = 0 V;
Logic "1" = VL, CL = 20 pF) Parameter Output Sample Rate (Master Mode) Single Speed Mode Double Speed Mode Quad Speed Mode MCLK Specifications MCLK Period MCLK Pulse Width High MCLK Pulse Width Low Master Mode SCLK falling to LRCK SCLK falling to SDOUT valid SCLK Duty Cycle SCLK Output Frequency Slave Mode Single Speed Output Sample Rate LRCK Duty Cycle SCLK Period SCLK High/Low SCLK falling to SDOUT valid SCLK falling to LRCK edge Double Speed Output Sample Rate LRCK Duty Cycle SCLK Period SCLK High/Low SCLK falling to SDOUT valid SCLK falling to LRCK edge Quad Speed Output Sample Rate LRCK Duty Cycle SCLK Period SCLK High/Low SCLK falling to SDOUT valid SCLK falling to LRCK edge tsclkw tsclkhl tdss tslrd Fs 170 40 78 32 -10 50 200 60 32 10 kHz % ns ns ns ns tsclkw tsclkhl tdss tslrd Fs 84 40 156 32 -20 50 100 60 32 20 kHz % ns ns ns ns tsclkw tsclkhl tdss tslrd Fs 4 40 156 32 -20 50 50 60 32 20 kHz % ns ns ns ns tmslr tsdo -20 0 50 50 20 32 ns ns % % tclkw tclkh tclkl 39 15 15 1953 ns ns ns Symbol Fs Fs Fs Min 2 50 100 Typ Max 50 100 200 Unit kHz kHz kHz
11
CS5340
SCLK output tmslr LRCK output tsdo SDOUT MSB MSB-1
LRCK input t lrdss SDOUT MSB SCLK input t sl rd
t sclkh t sclkl
t sclkw
t dss MSB-1 MSB-2
Figure 13. Master Mode, Left Justified SAI
Figure 14. Slave Mode, Left Justified SAI
SCLK output tmslr LRCK output tsdo SDOUT MSB
LRCK input SCLK input
t sclkh t sclkl
t sclkw
t dss
SDOUT
MSB
MSB-1
Figure 15. Master Mode, I2S SAI
Figure 16. Slave Mode, I2S SAI
12
CS5340
2 PIN DESCRIPTION
M0 MCLK VL SDOUT GND VD SCLK LRCK 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 M1 FILT+ REF_GND VA AINR VQ AINL RST
Pin Name
M0 M1 MCLK VL SDOUT GND VD SCLK LRCK RST AINL AINR VQ VA FILT+
# 1 16 2 3 4 5,14 6 7 8 9 10 12 11 13 15
Pin Description
Mode Selection (Input) - Determines the operational mode of the device. Master Clock (Input) - Clock source for the delta-sigma modulator and digital filters. Logic Power (Input) - Positive power for the digital input/output. Serial Audio Data Output (Output) - Output for two's complement serial audio data. Ground (Input) - Ground reference. Must be connected to analog ground. Digital Power (Input) - Positive power supply for the digital section. Serial Clock (Input/Output) - Serial clock for the serial audio interface. Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the serial audio data line. Reset (Input) - The device enters a low power mode when low. Analog Input (Input) - The full scale analog input level is specified in the Analog Characteristics specification table. Quiescent Voltage (Output) - Filter connection for the internal quiescent reference voltage. Analog Power (Input) - Positive power supply for the analog section. Positive Voltage Reference (Output) - Positive reference voltage for the internal sampling circuits.
13
CS5340
3 TYPICAL CONNECTION DIAGRAM
3.3V to 5V
+
1 F
0.1 F
**
0.1 F
+
1 F
2.5V to 5V
3.3V to 5V
+
1 F
0.1 F
5.1
0.1 F VD
VL
VA FILT+
1 F
+
0.1 F
REFGND +
1F 0.1 F
VQ RST M0 M1 Power Down and Mode Settings
CS5340 A/D CONVERTER
VL or GND 10k
*
Audio Data Processor
AINL
Analog Input Buffer Figure 21
AINR
SDOUT
MCLK LRCK SCLK Timing Logic and Clock
GND
* Pull-up to VL for I2S Pull-down to GND for LJ ** Resistor may only be used if VD is derived from VA. If used, do not drive any other logic from VD
Figure 17. Typical Connection Diagram
14
CS5340
4 APPLICATIONS 4.1 Single, Double, and Quad Speed Modes
The CS5340 can support output sample rates from 2 kHz to 200 kHz when operating as a clock master (see Section 4.2 for more information). By definition, Single Speed mode is defined as output sample rates between 2 kHz and 50 kHz. Double Speed mode is defined as output sample rates between 50 kHz and 100 kHz, and Quad Speed mode is defined as output sample rates between 100 kHz and 200 kHz. The output sample rate ranges listed above are how the speed modes are defined, and do not imply an absolute sample rate specification. If the absolute frequency of the sample rate is increased above that defined for a given speed mode, the analog performance will degrade. This is due to the fact that the analog input is sampling faster than designed and therefore does not have as much time to settle, which adds distortion.
4.2
Operation as Either a Clock Master or Slave
The CS5340 supports operation as either a clock master or slave. As a clock master, the LRCK and SCLK pins are outputs with the left/right and serial clocks synchronously generated on-chip. As a clock slave, the LRCK and SCLK pins are inputs and require the left/right and serial clocks to be externally generated. The selection of clock master or slave is made via the Mode pins as shown in Table 1.
M1(Pin 16) 0 0 1 1
M0(Pin 1) 0 1 0 1
MODE Clock Master, Single Speed Mode Clock Master, Double Speed Mode Clock Master, Quad Speed Mode Clock Slave, All Speed Modes
Output Sample Rate (Fs) 2 kHz - 50 kHz 50 kHz - 100 kHz 100 kHz - 200 kHz Refer to Table 2
Table 1. CS5340 Mode Control
4.2.1
Operation as a Clock Master
As a clock master, LRCK and SCLK operate as outputs. The left/right and serial clocks are internally derived from the master clock with the left/right clock equal to Fs and the serial clock equal to 64x Fs, as shown in Figure 18.
15
CS5340
/ 256 / 128 / 64 /1 MCLK /2 1 /4 Auto-Select /2 /1
Figure 18. CS5340 Master Mode Clocking
Single Speed Double Speed Quad Speed
00 01 10
LRCK Output (Equal to Fs)
0 M1 M0
Single Speed Double Speed Quad Speed
00 01 10
SCLK Output
4.2.2
Operation as a Clock Slave
LRCK and SCLK operate as inputs in clock slave mode. It is recommended that the left/right clock be synchronously derived from the master clock and must be equal to Fs. It is also recommended that the serial clock be synchronously derived from the master clock and be equal to 64x Fs to maximize system performance. A unique feature of the CS5340 is the automatic selection of either Single, Double or Quad speed mode when operating as a clock slave. The auto-mode select feature negates the need to configure the Mode pins to correspond to the desired mode. The auto-mode selection feature supports all standard audio sample rates from 32 to 200 kHz. However, there are ranges of non-standard audio sample rates that are not supported when operated as a clock slave. Please refer to Table 2.
Output Sample Rate (Fs) 4 kHz - 50 kHz 84 kHz - 100 kHz 170 kHz - 200 kHz
MODE Single Speed Mode Double Speed Mode Quad Speed Mode
Table 2. CS5340 Auto-Detect
16
CS5340
4.2.3 Master Clock
The CS5340 requires a Master clock (MCLK) which runs the internal sampling circuits and digital filters. There is also an internal MCLK divider which is automatically activated based on the speed mode and frequency of the MCLK. Table 3 shows a listing of the external MCLK/LRCK ratios that are required. Table 4 lists some common audio output sample rates and the required MCLK frequency. Please note that not all of the listed sample rates are supported in clock slave mode. Refer to Section 4.2.2 for details.
Single Speed Mode
Double Speed Mode
Quad Speed Mode
MCLK/LRCK Ratio
256x, 512x
128x, 256x
128x
Table 3. Master Clock (MCLK) Ratios
SAMPLE RATE (kHz) 32 44.1 48 64 88.2 96 192
MCLK (MHz) 8.192 16.384 11.2896 22.5792 12.288 24.576 8.192 16.384 11.2896 22.5792 12.288 24.576 12.288 24.576
Table 4. Master Clock (MCLK) Frequencies for Standard Audio Sample Rates
4.3
Serial Audio Interface
The CS5340 supports both I2S and Left Justified serial audio formats. Upon start-up, the CS5340 will detect the logic level on SDOUT (pin 4). A 10k pull-up to VL is needed to select I2S format, and a 10k pull-down to GND is needed to select Left Justified format. Please see Figures 13 through 16 on page 12, for more information on the required timing for the two serial audio interface formats.
17
CS5340
LRC K
L e ft C ha n ne l
R ig h t C h an n el
SC LK
S D AT A
23 22
9
8
7
6
5
4
3
2
1
0
23 22
9
8
7
6
5
4
3
2
1
0
23 2 2
Figure 19. Left-Justified Serial Audio Interface
LRCK Le ft C h an n e l R ig h t C h a nn el
S C LK
SDA TA
23 22
9
8
7
6
5
4
3
2
1
0
23 22
9
8
7
6
5
4
3
2
1
0
23 2 2
Figure 20. I2S Serial Audio Interface
4.4
Power-up Sequence
Reliable power-up can be accomplished by keeping the device in reset until the power supplies, clocks and configuration pins are stable. It is also recommended that reset be enabled if the analog or digital supplies drop below the minimum specified operating voltages to prevent power glitch related issues.
4.5
Analog Connections
The analog modulator samples the input at 6.144 MHz. The digital filter will reject signals within the stopband of the filter. However, there is no rejection for input signals which are multiples of the input sampling frequency (n * 6.144 MHz), where n=0,1,2,... Refer to Figure 21 on page 19 which shows the suggested filter that will attenuate any noise energy at 6.144 MHz, in addition to providing the optimum source impedance for the modulators. The use of capacitors which have a large voltage coefficient (such as general purpose ceramics) must be avoided since these can degrade signal linearity.
18
CS5340
634 VA
470 pF COG 100k + 100k COG 2200 pF 91 CS5340 AINL
4.7 uF AINL
VA
100k 4.7 uF AINR 100k + 470 pF COG COG 2200 pF 634 91 CS5340 AINR
Figure 21. CS5340 Recommended Analog Input Buffer
4.6
Grounding and Power Supply Decoupling
As with any high resolution converter, the CS5340 requires careful attention to power supply and grounding arrangements if its potential performance is to be realized. Figure 17 shows the recommended power arrangements, with VA and VL connected to clean supplies. VD, which powers the digital filter, may be run from the system logic supply or may be powered from the analog supply via a resistor. In this case, no additional devices should be powered from VD. Decoupling capacitors should be as near to the ADC as possible, with the low value ceramic capacitor being the nearest. All signals, especially clocks, should be kept away from the FILT+ and VQ pins in order to avoid unwanted coupling into the modulators. The FILT+ and VQ decoupling capacitors, particularly the 0.1 F, must be positioned to minimize the electrical path from FILT+ and REF_GND. The CDB5340 evaluation board demonstrates the optimum layout and power supply arrangements. To minimize digital noise, connect the ADC digital outputs only to CMOS inputs.
4.7
Synchronization of Multiple Devices
In systems where multiple ADCs are required, care must be taken to achieve simultaneous sampling. To ensure synchronous sampling, the MCLK and LRCK must be the same for all of the CS5340's in the system. If only one master clock source is needed, one solution is to place one CS5340 in Master mode, and slave all of the other CS5340's to the one master. If multiple master clock sources are needed, a possible solution would be to supply all clocks from the same external source and time the CS5340 reset with the inactive (falling) edge of MCLK. This will ensure that all converters begin sampling on the same clock edge.
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CS5340
5 PARAMETER DEFINITIONS
The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified bandwidth. Dynamic Range is a signal-to-noise ratio measurement over the specified bandwidth made with a -60 dBFS signal. 60 dB is added to resulting measurement to refer the measurement to full-scale. This technique ensures that the distortion components are below the noise level and do not affect the measurement. This measurement technique has been accepted by the Audio Engineering Society, AES17-1991, and the Electronic Industries Association of Japan, EIAJ CP-307. Expressed in decibels.
Total Harmonic Distortion + Noise
Dynamic Range
The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified bandwidth (typically 10 Hz to 20 kHz), including distortion components. Expressed in decibels. Measured at -1 and -20 dBFS as suggested in AES17-1991 Annex A.
Frequency Response
A measure of the amplitude response variation from 10 Hz to 20 kHz relative to the amplitude response at 1 kHz. Units in decibels.
Interchannel Isolation
A measure of crosstalk between the left and right channels. Measured for each channel at the converter's output with no signal to the input under test and a full-scale signal applied to the other channel. Units in decibels.
Interchannel Gain Mismatch
The gain difference between left and right channels. Units in decibels.
Gain Error
The deviation from the nominal full-scale analog input for a full-scale digital output.
Gain Drift
The change in gain value with temperature. Units in ppm/C.
Offset Error
The deviation of the mid-scale transition (111...111 to 000...000) from the ideal. Units in mV.
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CS5340
6 PACKAGE DIMENSIONS
16L TSSOP (4.4 mm BODY) PACKAGE DRAWING
N
D
E11 A2 A1
L
E
A
e b2 SIDE VIEW
123
END VIEW
SEATING PLANE
TOP VIEW
DIM A A1 A2 b D E E1 e L
MIN -0.002 0.03346 0.00748 0.193 0.248 0.169 -0.020 0
INCHES NOM -0.004 0.0354 0.0096 0.1969 0.2519 0.1732 0.026 BSC 0.024 4
MAX 0.043 0.006 0.037 0.012 0.201 0.256 0.177 -0.028 8
MIN -0.05 0.85 0.19 4.90 6.30 4.30 -0.50 0
MILLIMETERS NOM --0.90 0.245 5.00 6.40 4.40 0.065 BSC 0.60 4
NOTE MAX 1.10 0.15 0.95 0.30 5.10 6.50 4.50 -0.70 8
2,3 1 1
JEDEC #: MO-153 Controlling Dimension is Millimeters Notes: 1. "D" and "E1" are reference datums and do not included mold flash or protrusions, but do include mold mismatch and are measured at the parting line, mold flash or protrusions shall not exceed 0.20 mm per side.
2. Dimension "b" does not include dambar protrusion/intrusion. Allowable dambar protrusion shall be 0.13 mm total in excess of "b" dimension at maximum material condition. Dambar intrusion shall not reduce dimension "b" by more than 0.07 mm at least material condition. 3. These dimensions apply to the flat section of the lead between 0.10 and 0.25 mm from lead tips.
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