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ASAHI KASEI
[AK4383]
AK4383
192kHz 24-Bit 2ch DAC with DSD input
GENERAL DESCRIPTION The AK4383 offers the perfect mix for cost and performance based audio systems. Using AKM's multi bit architecture for its modulator the AK4383 delivers a wide dynamic range while preserving linearity for improved THD+N performance. The AK4383 has full differential SCF outputs, removing the need for AC coupling capacitors and increasing performance for systems with excessive clock jitter. The AK4383 accepts 192kHz PCM data and 1-Bit DSD data, ideal for a wide range of applications including DVDAudio and SACD. The AK4383 is offered in a space saving 20pin TSSOP package. FEATURES Sampling Rate Ranging from 8kHz to 192kHz 24-Bit 8 times FIR Digital Filter On chip SCF Digital de-emphasis for 32k, 44.1k and 48kHz sampling Soft mute Digital Attenuator (Linear 256 steps) PCM I/F format: 24-Bit MSB justified, 24/20/16-Bit LSB justified or I2S Master clock: 256fs, 384fs, 512fs or 768fs (PCM Normal Speed Mode) 128fs, 192fs, 256fs or 384fs (PCM Double Speed Mode) 128fs or 192fs (PCM Quad Speed Mode) 512fs or 768fs (DSD Mode) THD+N: -94dB Dynamic Range: 110dB DSD Data Input Mode High Tolerance to Clock Jitter Power supply: 4.75 to 5.25V Very Small Package: 20pin TSSOP (0.65mm pitch) AK4382 Pin Compatible
MCLK VDD CSN CCLK CDTI
P Interface
De-emphasis Control
Clock Divider
VSS DZFL DZFR
LRCK/DSDR BICK/DCLK SDTI/DSDL
PCM Data Interface
8X Interpolator 8X Interpolator
S&H Modulator
AOUTL+
SCF
AOUTLAOUTR+
S&H Modulator
SCF
AOUTR-
DCLK DSDL DSDR
DSD Data Interface
PDN
DSDM
MS0090-E-00 -1-
2001/4
ASAHI KASEI
[AK4383]
Ordering Guide
AK4383VT AKD4383 -40 +85C 20pin TSSOP (0.65mm pitch) Evaluation Board for AK4383
Pin Layout
MCLK BICK/DCLK SDTI/DSDL LRCK/DSDR PDN CSN CCLK CDTI DCLK DSDL
1 2 3 4 5 6 7 8 9 10
20 19 18
DZFL DZFR VDD VSS AOUTL+ AOUTLAOUTR+ AOUTRDSDM DSDR
Top View
17 16 15 14 13 12 11
MS0090-E-00 -2-
2001/4
ASAHI KASEI
[AK4383]
PIN/FUNCTION
No. 1 2 3 4 5 Pin Name MCLK BICK/DCLK SDTI/DSDL LRCK/DSDR PDN I/O I I I I I Function Master Clock Input Pin An external TTL clock should be input on this pin. Audio Serial Data Clock Pin / DSD Clock Pin Audio Serial Data Input Pin / DSD Lch Data Input Pin L/R Clock Pin / DSD Rch Data Input Pin Power-Down Mode Pin When at "L", the AK4383 is in the power-down mode and is held in reset. The AK4383 should always be reset upon power-up. Chip Select Pin Control Data Input Pin Control Data Input Pin in serial mode DSD Clock Pin (Pull-down Pin) DSD Lch Data Input Pin (Pull-down Pin) DSD Rch Data Input Pin (Pull-down Pin) DSD Mode Enable Pin (Pull-down Pin) "0": PCM data is input from Pin 2-4. And the mode can be switched between PCM and DSD mode by register. "1": DSD data is input from Pin 9-11. Rch Negative Analog Output Pin Rch Positive Analog Output Pin Lch Negative Analog Output Pin Lch Positive Analog Output Pin Ground Pin Power Supply Pin Rch Data Zero Input Detect Pin Lch Data Zero Input Detect Pin
6 7 8 9 10 11 12
CSN CCLK CDTI DCLK DSDL DSDR DSDM
I I I I I I I
13 14 15 16 17 18 19 20
AOUTRAOUTR+ AOUTLAOUTL+ VSS VDD DZFR DZFL
O O O O O O
Note: All input pins except pull-up pin should not be left floating.
MS0090-E-00 -3-
2001/4
ASAHI KASEI
[AK4383]
ABSOLUTE MAXIMUM RATINGS
(VSS=0V; Note 1) Parameter Power Supply Input Current (any pins except for supplies) Input Voltage Ambient Operating Temperature Storage Temperature Note: 1. All voltages with respect to ground. Symbol VDD IIN VIND Ta Tstg min -0.3 -0.3 -40 -65 max 6.0 10 VDD+0.3 85 150 Units V mA V C C
WARNING: Operation at or beyond these limits may results in permanent damage to the device. Normal operation is not guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS
(VSS=0V; Note 1) Parameter Power Supply Symbol VDD min 4.75 typ 5.0 max 5.25 Units V
*AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
MS0090-E-00 -4-
2001/4
ASAHI KASEI
[AK4383]
ANALOG CHARACTERISTICS
(Ta=25C; VDD=5.0V; fs=44.1kHz; BICK=64fs; Signal Frequency=1kHz; 24bit Input Data; Measurement frequency=20Hz 20kHz; RL 2k; PCM Mode; unless otherwise specified) Parameter min typ max Resolution 24 Dynamic Characteristics (Note 3) THD+N fs=44.1kHz 0dBFS -94 -87 BW=20kHz -60dBFS -48 fs=96kHz 0dBFS -92 -84 BW=40kHz -60dBFS -45 fs=192kHz 0dBFS -92 BW=40kHz -60dBFS -45 Dynamic Range (-60dBFS with A-weighted) (Note 4) 102 110 S/N (A-weighted) (Note 5) 102 110 Interchannel Isolation (1kHz) 90 110 Interchannel Gain Mismatch 0.2 0.5 DC Accuracy Gain Drift 100 Output Voltage (Note 6) 2.3 2.5 2.7 Load Resistance (Note 7) 2 Power Supplies Power Supply Current (VDD) 20 34 Normal Operation (PDN = "H", fs96kHz) 25 42 Normal Operation (PDN = "H", fs=192kHz) 10 100 Power-Down Mode (PDN = "L") (Note 8) Notes: 3. Measured by Audio Precision (System Two). Refer to the evaluation board manual. 4. 100dB at 16bit data. 5. S/N does not depend on input bit length. 6. Full-scale voltage (0dB). Output voltage scales with the voltage of VREF, AOUT (typ.@0dB)=(AOUT+)-(AOUT-)=2.5Vpp x VREF/5. 7. For AC-load. 4k for DC-load. 8. All digital inputs including clock pins (MCLK, BICK and LRCK) are held VDD or VSS.
Units Bits dB dB dB dB dB dB dB dB dB dB ppm/C Vpp k
mA mA A
MS0090-E-00 -5-
2001/4
ASAHI KASEI
[AK4383]
SHARP ROLL-OFF FILTER CHARACTERISTICS
(Ta = 25C; VDD = 4.75 5.25V; fs = 44.1kHz; DEM = OFF; SLOW= "0"; PCM Mode) Parameter Symbol min typ max Units Digital filter PB 0 20.0 kHz Passband 0.05dB (Note 9) 22.05 kHz -6.0dB Stopband (Note 9) SB 24.1 kHz Passband Ripple PR dB 0.02 Stopband Attenuation SA 54 dB Group Delay (Note 10) GD 19.3 1/fs Digital Filter + SCF Frequency Response 20.0kHz fs=44.1kHz FR dB 0.2 40.0kHz fs=96kHz FR dB 0.3 80.0kHz fs=192kHz FR dB +0/-0.6 Notes: 9. The passband and stopband frequencies scale with fs(system sampling rate). For example, PB=0.4535xfs (@0.05dB), SB=0.546xfs. 10. The calculating delay time which occurred by digital filtering. This time is from setting the 16/24bit data of both channels to input register to the output of analog signal.
SLOW ROLL-OFF FILTER CHARACTERISTICS
(Ta = 25C; AVDD, DVDD = 4.75~5.25V; fs = 44.1kHz; DEM = OFF; SLOW = "1"; PCM Mode) Parameter Digital Filter Passband 0.04dB -3.0dB (Note 11) (Note 11) PB SB PR SA GD 0 39.2 72 18.2 8.1 0.005 19.3 +0/-5 +0/-4 +0/-5 kHz kHz kHz dB dB 1/fs dB dB dB Symbol min typ max Units
Stopband Passband Ripple Stopband Attenuation Group Delay Digital Filter + SCF Frequency Response
(Note 10)
FR 20.0kHz fs=44.kHz fs=96kHz 40.0kHz FR 80.0kHz fs=192kHz FR Note: 11. The passband and stopband frequencies scale with fs. For example, PB = 0.185xfs (@0.04dB), SB = 0.888xfs.
DC CHARACTERISTICS
(Ta=25C; VDD=4.75 5.25V) Parameter Symbol min typ max High-Level Input Voltage VIH 2.2 Low-Level Input Voltage VIL 0.8 High-Level Output Voltage (Iout=-80A) VOH VDD-0.4 Low-Level Output Voltage (Iout=80A) VOL 0.4 Input Leakage Current (Note 12) Iin 10 Note: 12. DSDM, DCLK, DSDL and DSDR pins have internal pull-down devices, nominally 100k. Units V V V V A
MS0090-E-00 -6-
2001/4
ASAHI KASEI
[AK4383]
SWITCHING CHARACTERISTICS
(Ta = 25C; VDD = 4.75 5.25V; CL = 20pF) Parameter Symbol min fCLK 2.048 Master Clock Frequency Duty Cycle dCLK 40 LRCK Frequency 8 fsn Normal Speed Mode 60 fsd Double Speed Mode 120 fsq Quad Speed Mode 45 Duty Duty Cycle PCM Audio Interface Timing BICK Period Normal Speed Mode 1/128fs tBCK Double/Quad Speed Mode 1/64fs tBCK BICK Pulse Width Low 30 tBCKL Pulse Width High 30 tBCKH 20 tBLR BICK "" to LRCK Edge (Note 13) 20 tLRB LRCK Edge to BICK "" (Note 13) 20 tSDH SDTI Hold Time 20 tSDS SDTI Setup Time DSD Audio Interface Timing DCLK Period 1/64fs tDCK DCLK Pulse Width Low 160 tDCKL Pulse Width High 160 tDCKH DCLK Edge to DSDL/R (Note 14) -20 tDDD Control Interface Timing CCLK Period 200 tCCK CCLK Pulse Width Low 80 tCCKL Pulse Width High 80 tCCKH CDTI Setup Time 40 tCDS CDTI Hold Time 40 tCDH CSN High Time 150 tCSW 50 tCSS CSN "" to CCLK "" 50 tCSH CCLK "" to CSN "" Reset Timing PDN Pulse Width (Note 15) tPD 150 Notes: 13. BICK rising edge must not occur at the same time as LRCK edge. 14. DSD data transmitting device must meet this time. 15. The AK4383 can be reset by bringing PDN= "L". typ 11.2896 max 36.864 60 48 96 192 55 Units MHz % kHz kHz kHz %
ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
20
MS0090-E-00 -7-
2001/4
ASAHI KASEI
[AK4383]
Timing Diagram
1/fCLK VIH VIL tCLKH tCLKL
dCLK=tCLKH x fCLK, tCLKL x fCLK
MCLK
1/fs VIH VIL
LRCK
tBCK VIH VIL tBCKH tBCKL
BICK
Clock Timing
LRCK tBLR tLRB
VIH VIL
BICK tSDS tSDH
VIH VIL
SDTI
VIH VIL
Audio Serial Interface Timing (PCM Mode)
tDCK tDCKL tDCKH VIH VIL tDDD DSDL DSDR VIH VIL
DCLK
Audio Serial Interface Timing (DSD Normal Mode, DCKB = "0")
MS0090-E-00 -8-
2001/4
ASAHI KASEI
[AK4383]
tDCK tDCKL tDCKH VIH VIL tDDD DSDL DSDR tDDD VIH VIL
DCLK
Audio Serial Interface Timing (DSD Phase Modulation Mode, DCKB = "0")
VIH CSN VIL tCSS tCCKL tCCKH VIH VIL tCDS tCDH VIH VIL
CCLK
CDTI
C1
C0
R/W
A4
WRITE Command Input Timing
tCSW VIH CSN VIL tCSH CCLK VIH VIL
CDTI
D3
D2
D1
D0
VIH VIL
WRITE Data Input Timing
tPD
PDN
VIL
Power-down Timing MS0090-E-00 -92001/4
ASAHI KASEI
[AK4383]
OPERATION OVERVIEW D/A Converion Mode
The AK4383 can perform D/A conversion for both PCM data and DSD data. When DSDM pin is "H", DSD data can be input from DCLK, DSDL and DSDR pins. PCM data can be input from BICK/DCLK, SDTI/DSDL and LRCK/DSDR pins by setting DSDM pin to "L". In this case, BICK/DCLK, SDTI/DSDL and LRCK/DSDR pins can accept DSD data by enabling DSD mode via the register (D/P = "1"). When PCM/DSD mode changes by DSDM pin or D/P bit, the AK4383 should be reset by PDN pin or RSTN bit. (Refer to D/A conversion mode switching timing.) DSDM pin L H D/P bit 0 1 0 1 Pin 2-4 PCM DSD * * Pin 9-11 * * DSD DSD DAC Output PCM DSD DSD DSD
Table 1. DSD/PCM Mode Control(* Don't care.)
System Clock
1) PCM Mode The external clocks, which are required to operate the AK4383, are MCLK, LRCK and BICK. The master clock (MCLK) should be synchronized with LRCK but the phase is not critical. The MCLK is used to operate the digital interpolation filter and the delta-sigma modulator. There are two methods to set MCLK frequency. In Manual Setting Mode (ACKS = "0": Register 00H), the sampling speed is set by DFS0/1(Table 2). The frequency of MCLK at each sampling speed is set automatically. (Table 3~5). In Auto Setting Mode (ACKS = "1": Default), as MCLK frequency is detected automatically (Table 6), and the internal master clock becomes the appropriate frequency (Table 7), it is not necessary to set DFS0/1. All external clocks (MCLK, BICK and LRCK) should always be present whenever the AK4383 is in the normal operation mode (PDN= "H"). If these clocks are not provided, the AK4383 may draw excess current because the device utilizes dynamic refreshed logic internally. The AK4383 should be reset by PDN= "L" after threse clocks are provided. If the external clocks are not present, the AK4383 should be in the power-down mode (PDN= "L"). After exiting reset at power-up etc., the AK4383 is in the power-down mode until MCLK is input. DFS1 0 0 1 DFS0 0 1 0 Sampling Rate (fs) Normal Speed Mode Double Speed Mode Quad Speed Mode 8kHz~48kHz 60kHz~96kHz 120kHz~192kHz Default
Table 2. Sampling Speed (Manual Setting Mode)
LRCK fs 32.0kHz 44.1kHz 48.0kHz
MCLK 256fs 8.1920MHz 11.2896MHz 12.2880MHz 384fs 12.2880MHz 16.9344MHz 18.4320MHz 512fs 16.3840MHz 22.5792MHz 24.5760MHz 768fs 24.5760MHz 33.8688MHz 36.8640MHz
BICK 64fs 2.0480MHz 2.8224MHz 3.0720MHz
Table 3. System Clock Example (Normal Speed Mode @Manual Setting Mode)
MS0090-E-00 - 10 -
2001/4
ASAHI KASEI
[AK4383]
LRCK fs 88.2kHz 96.0kHz
128fs 11.2896MHz 12.2880MHz
MCLK 192fs 256fs 16.9344MHz 22.5792MHz 18.4320MHz 24.5760MHz
384fs 33.8688MHz 36.8640MHz
BICK 64fs 5.6448MHz 6.1440MHz
Table 4. System Clock Example (Double Speed Mode @Manual Setting Mode)
LRCK fs 176.4kHz 192.0kHz
MCLK 128fs 22.5792MHz 24.5760MHz 192fs 33.8688MHz 36.8640MHz
BICK 64fs 11.2896MHz 12.2880MHz
Table 5. System Clock Example (Quad Speed Mode @Manual Setting Mode)
MCLK 512fs 768fs 256fs 384fs 128fs 192fs
Sampling Speed Normal Double Quad
Table 6. Sampling Speed (Auto Setting Mode)
LRCK fs 32.0kHz 44.1kHz 48.0kHz 88.2kHz 96.0kHz 176.4kHz 192.0kHz
128fs 22.5792 24.5760
192fs 33.8688 36.8640
MCLK (MHz) 256fs 384fs 22.5792 33.8688 24.5760 36.8640 -
512fs 16.3840 22.5792 24.5760 -
768fs 24.5760 33.8688 36.8640 -
Sampling Speed Normal Double Quad
Table 7. System Clock Example (Auto Setting Mode)
2) DSD Mode The external clocks, which are required to operate the AK4383, are MCLK and DCLK. The master clock (MCLK) should be synchronized with DSD clock (DCLK) but the phase is not critical. The frequency of MCLK is set by DCKS bit. DCKS MCLK DCLK 0 512fs 64fs 1 768fs 64fs
Table 8. System Clock (fs=44.1kHz)
MS0090-E-00 - 11 -
2001/4
ASAHI KASEI
[AK4383]
Audio Serial Interface Format
1) PCM Mode Data is shifted in via the SDTI pin using BICK and LRCK inputs. The DIF0-2 as shown in Table 7 can select five serial data modes. In all modes the serial data is MSB-first, 2's compliment format and is latched on the rising edge of BICK. Mode 2 can be used for 16/20 MSB justified formats by zeroing the unused LSBs. Mode 0 1 2 3 4 DIF2 0 0 0 0 1 DIF1 0 0 1 1 0 DIF0 0 1 0 1 0 SDTI Format 16bit LSB Justified 20bit LSB Justified 24bit MSB Justified 24bit I2S Compatible 24bit LSB Justified BICK 32fs 40fs 48fs 48fs 48fs Figure Figure 1 Figure 2 Figure 3 Figure 4 Figure 2
Default
Table 9. Audio Data Formats
LRCK
0 1 10 11 12 13 14 15 0 1 10 11 12 13 14 15 0 1
BICK (32fs) SDTI Mode 0
0
15
1
14
6
14
5
15
4
16
3
17
2
1
31
0
0
15
1
14
6
14
5
15
4
16
3
17
2
1
31
0
15
0
14
1
BICK (64fs) SDTI Mode 0
Don't care 15:MSB, 0:LSB 15 14 0 Don't care 15 14 0
Lch Data
Figure 1. Mode 0 Timing
Rch Data
LRCK
0 1 8 9 10 11 12 31 0 1 8 9 10 11 12 31 0 1
BICK (64fs) SDTI Mode 1 SDTI Mode 4
Don't care 19:MSB, 0:LSB Don't care 23 22 21 20 19 0 Don't care 23 22 21 20 19 0 19 0 Don't care 19 0
23:MSB, 0:LSB
Lch Data
Figure 2. Mode 1,4 Timing MS0090-E-00 - 12 -
Rch Data
2001/4
ASAHI KASEI
[AK4383]
LRCK
0 1 2 22 23 24 30 31 0 1 2 22 23 24 30 31 0 1
BICK (64fs) SDTI
23 22 23:MSB, 0:LSB 1 0 Don't care 23 22 1 0 Don't care 23 22
Lch Data
Figure 3. Mode 2 Timing
Rch Data
LRCK
0 1 2 3 23 24 25 31 0 1 2 3 23 24 25 31 0 1
BICK (64fs) SDTI
23 22 23:MSB, 0:LSB 1 0 Don't care 23 22 1 0 Don't care 23
Lch Data
Figure 4. Mode 3 Timing
Rch Data
2) DSD Mode In case of DSD mode, DIF0-2 are ignored. The frequency of DCLK is fixed to 64fs. DCKB bit can invert the polarity of DCLK.
DCLK (64fs) DCKB=1 DCLK (64fs) DCKB=0 DSDL,DSDR Normal DSDL,DSDR
Phase Modulation
D0 D1 D2 D3
D0
D1
D1
D2
D2
D3
Figure 5. DSD Mode Timing
MS0090-E-00 - 13 -
2001/4
ASAHI KASEI
[AK4383]
De-emphasis Filter
A digital de-emphasis filter is available for 32, 44.1 or 48kHz sampling rates (tc = 50/15s) and is enabled or disabled with DEM0 and DEM1. In case of double speed and quad speed mode, the digital de-emphasis filter is always off. DEM1 0 0 1 1 DEM0 0 1 0 1 Mode 44.1kHz OFF 48kHz 32kHz Default
Table 8. De-emphasis Filter Control (Normal Speed Mode)
Output Volume
The AK4383 includes channel independent digital output volumes (ATT) with 256 levels at linear step including MUTE. These volumes are in front of the DAC and can attenuate the input data from 0dB to -48dB and mute. When changing levels, transitions are executed via soft changes; thus no switching noise occurs during these transitions. Table 11 shows transition times of 1 level and 256 levels. The setting value of the register is held when switching between PCM mode and DSD mode. The transition time at DSD mode is the same as Normal Speed Mode. Sampling Speed Normal Speed Mode Double Speed Mode Quad Speed Mode Transition Time 1 Level 255 to 0 4LRCK 1020LRCK 8LRCK 2040LRCK 16LRCK 4080LRCK
Table 11. ATT Transition Time
Zero Detection
The AK4383 has channel-independent zeros detect function. When the input data at each channel is continuously zeros for 8192 LRCK cycles, DZF pin of each channel goes to "H". DZF pin of each channel immediately goes to "L" if input data of each channel is not zero after going DZF "H". If RSTN bit is "0", DZF pins of both channels go to "H". DZF pins of both channels go to "L" at 2~3/fs after RSTN bit returns to "1". If DZFM bit is set to "1", DZF pins of both channels go to "H" only when the input data at both channels are continuously zeros for 8192 LRCK cycles. Zero detect function can be disabled by DZFE bit. In this case, DZF pins of both channels are always "L". DZFB bit can invert the polarity of DZF pin.
MS0090-E-00 - 14 -
2001/4
ASAHI KASEI
[AK4383]
Soft Mute Operation
Soft mute operation is performed at digital domain. When the SMUTE bit goes to "1", the output signal is attenuated by - during ATT_DATAxATT transition time (Table 11) from the current ATT level. When the SMUTE bit is returned to "0", the mute is cancelled and the output attenuation gradually changes to the ATT level during ATT_DATAxATT transition time. If the soft mute is cancelled before attenuating to - after starting the operation, the attenuation is discontinued and returned to ATT level by the same cycle. The soft mute is effective for changing the signal source without stopping the signal transmission.
SMUTE bit (1) (1) (3)
ATT Level Attenuation
-
GD (2) AOUT (4) 8192/fs GD
DZF pin
Notes: (1) ATT_DATAxATT transition time (Table 11). For example, in Normal Speed Mode, this time is 1020LRCK cycles (1020/fs) at ATT_DATA=255. (2) The analog output corresponding to the digital input has a group delay, GD. (3) If the soft mute is cancelled before attenuating to - after starting the operation, the attenuation is discontinued and returned to ATT level by the same cycle. (4) When the input data at each channel is continuously zeros for 8192 LRCK cycles, DZF pin of each channel goes to "H". DZF pin immediately goes to "L" if input data are not zero after going DZF "H". Figure 6. Soft Mute and Zero Detection
MS0090-E-00 - 15 -
2001/4
ASAHI KASEI
[AK4383]
System Reset
The AK4383 should be reset once by bringing PDN= "L" upon power-up. The analog section exits power-down mode by MCLK input and then the digital section exits power-down mode after the internal counter counts MCLK during 4/fs.
Power-down
The AK4383 is placed in the power-down mode by bringing PDN pin "L" and the anlog outputs are floating (Hi-Z). Figure 7 shows an example of the system timing at the power-down and power-up.
PDN
Internal State D/A In (Digital)
GD
Normal Operation
Power-down
Normal Operation
"0" data
(1)
GD
D/A Out (Analog)
Clock In
MCLK, LRCK, BICK
(3) (4)
(2)
(3)
(1)
Don't care
DZFL/DZFR External MUTE
(6)
(5)
Mute ON
Notes: (1) The analog output corresponding to digital input has the group delay (GD). (2) Analog outputs are floating (Hi -Z) at the power-down mode. (3) Click noise occurs at the edge of PDN signal. This noise is output even if "0" data is input. (4) The external clocks (MCLK, BICK and LRCK) can be stopped in the power-down mode (PDN = "L"). (5) Please mute the analog output externally if the click noise (3) influences system application. The timing example is shown in this figure. (6) DZF pins are "L" in the power-down mode (PDN = "L"). Figure 7. Power-down/up Sequence Example
MS0090-E-00 - 16 -
2001/4
ASAHI KASEI
[AK4383]
Reset Function
When RSTN=0, DAC is powered down but the internal register values are not initialized. The analog outputs go to VCOM voltage and DZFL/DZFR pins go to "H". Figure 8 shows the example of reset by RSTN bit.
RSTN bit
3~4/fs (6) 2~3/fs (6)
Internal RSTN bit Internal State D/A In (Digital) (1) D/A Out (Analog)
Clock In
MCLK,LRCK,BICK
Normal Operation
Digital Block Power-down
Normal Operation
"0" data GD GD
(3)
(2) (4)
Don't care
(3)
(1)
2/fs(5)
DZF Notes: (1) The analog output corresponding to digital input has the group delay (GD). (2) Analog outputs go to VCOM voltage. (3) Click noise occurs at the edges(" ") of the internal timing of RSTN bit. This noise is output even if "0" data is input. (4) The external clocks (MCLK, BICK and LRCK) can be stopped in the reset mode (RSTN = "L"). (5) DZF pins go to "H" when the RSTN bit becomes "0", and go to "L" at 2/fs after RSTN bit becomes "1". (6) There is a delay, 3~4/fs from RSTN bit "0" to the internal RSTN bit "0", and 2~3/fs from RSTN bit "1" to the internal RSTN "1". Figure 8. Reset Sequence Example
MS0090-E-00 - 17 -
2001/4
ASAHI KASEI
[AK4383]
D/A conversion mode switching timing
RSTN bit
4/fs
D/A Mode
PCM Mode 0
DSD Mode
D/A Data
PCM Data
DSD Data
Figure 9. D/A Mode Switching Timing (PCM to DSD)
RSTN bit D/A Mode
DSD Mode 4/fs
PCM Mode
D/A Data
DSD Data
PCM Data
Figure 10. D/A Mode Switching Mode Timing (DSD to PCM)
Caution: In DSD mode, the signal level is ranging from 25% to 75%. Peak levels of DSD signal above this duty are not recommended by SACD format book (Scarlet Book).
MS0090-E-00 - 18 -
2001/4
ASAHI KASEI
[AK4383]
Mode Control Interface
Internal registers may be written by 3-wire P interface pins, CSN, CCLK and CDTI. The data on this interface consists of Chip Address (2bits, C1/0; fixed to "01"), Read/Write (1bit; fixed to "1", Write only), Register Address (MSB first, 5bits) and Control Data (MSB first, 8bits). The AK4383 latches the data on the rising edge of CCLK, so data should clocked in on the falling edge. The writing of data becomes valid by CSN "". The clock speed of CCLK is 5MHz (max). The CSN and CCLK must be fixed to "H" when the register does not be accessed. PDN = "L" resets the registers to their default values. The internal timing circuit is reset by RSTN bit, but the registers are not initialized. CSN
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
CCLK
CDTI
C1 C0 R/W A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
C1-C0: R/W: A4-A0: D7-D0:
Chip Address (Fixed to "01") READ/WRITE (Fixed to "1", Write only) Register Address Control Data
Figure 11. Control I/F Timing *The AK4383 does not support the read command and chip address. C1/0 and R/W are fixed to "011" *When the AK4383 is in the power down mode (PDN = "L") or the MCLK is not provided, writing into the control register is inhibited.
Register Map
Addr 00H 01H 02H 03H 04H Notes: For addresses from 05H to 1FH, data must not be written. When PDN pin goes "L", the registers are initialized to their default values. When RSTN bit goes "0", the only internal timing is reset and the registers are not initialized to their default values. All data can be written to the register even if PW or RSTN bit is "0". Register Name Control 1 Control 2 Control 3 Lch ATT Rch ATT D7 ACKS DZFE 0 ATT7 ATT7 D6 0 DZFM 0 ATT6 ATT6 D5 0 SLOW DCKS ATT5 ATT5 D4 DIF2 DFS1 D/P ATT4 ATT4 D3 DIF1 DFS0 DCKB ATT3 ATT3 D2 DIF0 DEM1 DZFB ATT2 ATT2 D1 PW DEM0 0 ATT1 ATT1 D0 RSTN SMUTE 0 ATT0 ATT0
MS0090-E-00 - 19 -
2001/4
ASAHI KASEI
[AK4383]
Register Definitions
Addr 00H Register Name Control 1 default D7 ACKS 1 D6 0 0 D5 0 0 D4 DIF2 0 D3 DIF1 1 D2 DIF0 0 D1 PW 1 D0 RSTN 1
RSTN: Internal timing reset control 0: Reset. All registers are not initialized. 1: Normal Operation When MCLK frequency or DFS changes, the AK4383 should be reset by PDN pin or RSTN bit. PW: Power down control 0: Power down. All registers are not initialized. 1: Normal Operation DIF2-0: Audio data interface formats (see Table 9, PCM only) Initial: "010", Mode 3 ACKS: Master Clock Frequency Auto Setting Mode Enable (PCM only) 0: Disable, Manual Setting Mode 1: Enable, Auto Setting Mode Master clock frequency is detected automatically at ACKS bit "1". In this case, the setting of DFS1-0 are ignored. When this bit is "0", DFS1-0 set the sampling speed mode.
Addr 01H
Register Name Control 2 default
D7 DZFE 0
D6 DZFM 0
D5 SLOW 0
D4 DFS1 0
D3 DFS0 0
D2 DEM1 0
D1 DEM0 1
D0 SMUTE 0
SMUTE: Soft Mute Enable 0: Normal operation 1: DAC outputs soft-muted DEM1-0: De-emphasis Response (see Table 10, PCM only) Initial: "01", OFF DFS1-0: Sampling speed control (PCM only) 00: Normal Speed Mode 01: Double Speed Mode 10: Quad Speed Mode When changing between Normal/Double Speed Mode and Quad Speed Mode, some click noise occurs. SLOW: Slow Roll-off Filter Enable (PCM only) 0: Sharp Roll-off Filter 1: Slow Roll-off Filter DZFE: Data Zero Detect Enable 0: Disable 1: Enable Zero detect function can be disabled by DZFE bit "0". In this case, the DZF pins of both channels are always "L".
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ASAHI KASEI
[AK4383]
DZFM: Data Zero Detect Mode 0: Channel Separated Mode 1: Channel ANDed Mode If the DZFM bit is set to "1", the DZF pins of both channels go to "H" only when the input data at both channels are continuously zeros for 8192 LRCK cycles.
Addr 02H
Register Name Control 3 default
D7 0 0
D6 0 0
D5 DCKS 0
D4 D/P 0
D3 DCKB 0
D2 DZFB 0
D1 0 0
D0 0 0
DZFB: Inverting Enable of DZF 0: DZF goes "H" at Zero Detection 1: DZF goes "L" at Zero Detection DCKB: Polarity of DCLK (DSD only) 0: DSD data is output from DCLK falling edge 1: DSD data is output from DCLK rising edge D/P: DSD/PCM Mode Select 0: PCM Mode. SCLK, SDTI, LRCK input on Pin 2-4. 1: DSD Mode. DCLK, DSDL, DSDR input on Pin 2-4. When D/P changes, the AK4383 should be reset by PDN pin or RSTN bit. DCKS: Master Clock Frequency Select at DSD mode (DSD only) 0: 512fs 1: 768fs Addr 03H 04H Register Name Lch ATT Rch ATT default D7 ATT7 ATT7 1 D6 ATT6 ATT6 1 D5 ATT5 ATT5 1 D4 ATT4 ATT4 1 D3 ATT3 ATT3 1 D2 ATT2 ATT2 1 D1 ATT1 ATT1 1 D0 ATT0 ATT0 1
ATT = 20 log (ATT_DATA / 255) [dB] 00H: Mute
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ASAHI KASEI
[AK4383]
SYSTEM DESIGN
Figure 12 shows the system connection diagram. An evaluation board (AKD4383) is available in order to allow an easy study on the layout of a surrounding circuit.
Master Clock PCM/DSD Data Controller Reset & Power down MicroController
1 2 3 4 5 6 7 8 9
MCLK BICK/DCLK SDTI/DSDL LRCK/DSDR PDN CSN CCLK CDTI DCLK DSDL
DZFL DZFR VDD VSS AOUTL+ AOUTLAOUTR+ AOUTRDSDM DSDR
20 19 18 0.1u 17 16 15 14 13 12 11 + 10u
Analog Supply 5V
Lch MUTE Rch MUTE
AK4383
Lch LPF Rch LPF
Lch Out
Rch Out
DSD Data Controller
10
Digital Ground
Analog Ground
Figure 12. Typical Connection Diagram Notes: - LRCK = fs, BICK = 64fs. - When AOUT drives some capacitive load, some resistor should be added in series between AOUT and capacitive load. - All input pins except pull-down pins should not be left floating.
1. Grounding and Power Supply Decoupling
VDD and VSS are supplied from analog supply and should be separated from system digital supply. Decoupling capacitor, especially 0.1F ceramic capacitor for high frequency should be placed as near to VDD as possible. The differential Voltage between VDD and VSS pins set the analog output range.
2. Analog Outputs
The analog outputs are full-differential outputs and 0.5 x VDD Vpp (typ) centered around the internal common voltage (about AVDD/2). The differential outputs are summed externally, VAOUT=(AOUT+)-(AOUT-) between AOUT+ and AOUT-. If the summing gain is 1, the output range is 5.0Vpp (typ @VDD=5V). The bias voltage of the external summing circuit is supplied externally. The input data format is 2's complement. The output voltage (VAOUT) is a positive full scale for 7FFFFF (@24bit) and a negative full scale for 800000H (@24bit). The ideal VAOUT is 0V for 000000H (@24bit). The internal switched-capacitor filter and external low pass filter attenuate the noise generated by the delta-sigma modulator beyond the audio passband. DC offset on AOUT+/- is eliminated without AC coupling since the analog outputs are differential.
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ASAHI KASEI
[AK4383]
3. External Analog Filter
It is recommended by SACD format book (Scarlet Book) that the filter response at SACD playback is an analog low pass filter with a cut-off frequency of maximum 50kHz and a slop of minimum 30dB/Oct. The AK4383 can achieve this filter response by combination of the internal filter (Table 12) and an external filter (Figure 11). Frequency 20kHz 50kHz 100kHz Gain -0.4dB -2.8dB -15.5dB
Table 12. Internal Filter Response at DSD mode
47u
AOUT2.5Vpp
2.0k
1.8k 1.0k 2200p 3300p
4.3k 270p
+Vop
1.8k 1.0k
47u
2.0k
+
AOUT+
2.5Vpp
4.3k 270p
Analog Out
5.65Vpp
-Vop
Figure 13. External 3rd order LPF Circuit Example Frequency Gain 20kHz -0.05dBr 50kHz -0.51dBr 100kHz -16.8dBr DC gain = 1.07dB Table 13. 3rd order LPF (Figure 13) Response
Application Example
1) Connection with DSD Decoder, CXD2751Q
BCKD CXD2751Q DSAL DSAR MCKI 22.579M /33.868M
DCLK DSDL DSDR AK4383 DSDM
MCLK
Phase Modulation Mode
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2001/4
ASAHI KASEI
[AK4383]
PACKAGE
20pin TSSOP (Unit: mm)
6.5 1.10max
20
11 A 6.40.2 0.170.05 0.10.1 Detail A 0.50.2 0.10 010
Epoxy Cu Solder plate 2001/4 - 24 -
1 0.220.1
10 0.65
Seating Plane
Package & Lead frame material
Package molding compound: Lead frame material: Lead frame surface treatment:
MS0090-E-00
4.4
ASAHI KASEI
[AK4383]
MARKING
AKM 4383VT XXYYY
1) 2) 3)
4)
Asahi Kasei Logo Marketing Code : 4383VT Date Code : XXYYY (5 digits) XX: lot# YYY: Date Code Pin #1 indication
IMPORTANT NOTICE * These products and their specifications are subject to change without notice. Before considering any use or application, consult the Asahi Kasei Microsystems Co., Ltd. (AKM) sales office or authorized distributor concerning their current status. * AKM assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any information contained herein. * Any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. * AKM products are neither intended nor authorized for use as critical components in any safety, life support, or other hazard related device or system, and AKM assumes no responsibility relating to any such use, except with the express written consent of the Representative Director of AKM. As used here: (a) A hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. (b) A critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. * It is the responsibility of the buyer or distributor of an AKM product who distributes, disposes of, or otherwise places the product with a third party to notify that party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold AKM harmless from any and all claims arising from the use of said product in the absence of such notification.
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2001/4

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