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ASAHI KASEI
[AK4387]
AK4387
106dB 192kHz 24-Bit 2ch DAC
GENERAL DESCRIPTION The AK4387 offers the perfect mix for cost and performance based audio systems. Using AKM's multi bit architecture for its modulator the AK4387 delivers a wide dynamic range while preserving linearity for improved THD+N performance. The AK4387 integrates a combination of SCF and CTF filters increasing performance for systems with excessive clock jitter. The 24 Bit word length and 192kHz sampling rate make this part ideal for a wide range of applications including DVD-Audio. The AK4387 is offered in a space saving 16pin TSSOP package. FEATURES Sampling Rate Ranging from 8kHz to 192kHz 128 times Oversampling (Normal Speed Mode) 64 times Oversampling (Double Speed Mode) 32 times Oversampling (Quad Speed Mode) 24-Bit 8 times FIR Digital Filter SCF with High Tolerance to Clock Jitter Single Ended Output Buffer Digital de-emphasis for 32k, 44.1k and 48kHz sampling Soft mute Digital Attenuator (Linear 256 steps) 2 I/F format: 24-Bit MSB justified, 24/20/16-Bit LSB justified or I S Master clock: 256fs, 384fs, 512fs, 768fs or 1152fs (Normal Speed Mode) 128fs, 192fs, 256fs or 384fs (Double Speed Mode) 128fs, 192fs (Quad Speed Mode) THD+N: -90dB Dynamic Range: 106dB Power supply: 4.5 to 5.5V Very Small Package: 16pin TSSOP
MCLK DVDD AVDD CSN CCLK CDTI
P Interface
De-emphasis Control
Clock Divider
VSS VCOM DZF
LRCK BICK SDTI
Audio Data Interface
ATT
8X Interpolator 8X Interpolator
Modulator Modulator
SCF LPF SCF LPF
AOUTL
ATT
AOUTR
RSTN
MS0429-E-00 -1-
2005/09
ASAHI KASEI
[AK4387]
Ordering Guide
AK4387ET AKD4387 -20 +85C 16pin TSSOP (0.65mm pitch) Evaluation Board for AK4387
Pin Layout
MCLK BICK SDTI LRCK RSTN CSN CCLK CDTI 1 2 3 4 5 6 7 8 16 15 14 DZF DVDD AVDD VSS VCOM AOUTL AOUTR NC
Top View
13 12 11 10 9
Compatibility with AK4384
1. Function Functions THD+N Output Voltage Slow Roll-Off Filter Mode Setting Zero Data Detect Pin 2. Pin Configuration AK4387 AK4384 MCLK MCLK BICK BICK SDTI SDTI LRCK LRCK RSTN PDN CSN SMUTE/CSN CCLK ACKS/CCLK CDTI DIF0/CDTI 3. Register map Addr Register Name 00H Control 1 01H Control 2 02H Control 3 03H Lch ATT 04H Rch ATT
AK4384 -94dB 3.4Vpp Available Serial/Parallel 2 pins
AK4387 -90dB 2.95Vpp Not Available Serial 1 pin
Pin# 1 2 3 4 5 6 7 8
Pin# 16 15 14 13 12 11 10 9
AK4384 DZFL DZFR VDD VSS VCOM AOUTL AOUTR P/S
AK4387 DZF DVDD AVDD VSS VCOM AOUTL AOUTR NC
D7 ACKS DZFE 0 ATT7 ATT7
D6 D5 D4 0 0 DIF2 1 0 DFS1 0 0 INVL ATT6 ATT5 ATT4 ATT6 ATT5 ATT4 : Different points from AK4384
D3 DIF1 DFS0 INVR ATT3 ATT3
D2 DIF0 DEM1 DZFB ATT2 ATT2
D1 PW DEM0 0 ATT1 ATT1
D0 RSTN SMUTE 0 ATT0 ATT0
MS0429-E-00 -2-
2005/09
ASAHI KASEI
[AK4387]
PIN/FUNCTION
Function Master Clock Input Pin An external TTL clock should be input on this pin. 2 BICK I Audio Serial Data Clock Pin 3 SDTI I Audio Serial Data Input Pin 4 LRCK I L/R Clock Pin 5 RSTN I Reset Mode Pin When at "L", the AK4387 is in the power-down mode and is held in reset. The AK4387 must be reset once upon power-up. 6 CSN I Chip Select Pin 7 CCLK I Control Data Clock Pin 8 CDTI I Control Data Input Pin 9 NC No Connect pin No internal bonding. This pin should be opened or connected to VSS. 10 AOUTR O Rch Analog Output Pin 11 AOUTL O Lch Analog Output Pin 12 VCOM O Common Voltage Pin, AVDD/2 Normally connected to VSS with a 0.1F ceramic capacitor in parallel with a 10F electrolytic cap. 13 VSS Ground Pin 14 AVDD Power Supply Pin 15 DVDD Power Supply Pin 16 DZF O Lch and Rch Data Zero Input Detect Pin Note: All input pins should not be left floating. No. 1 Pin Name MCLK I/O I
ABSOLUTE MAXIMUM RATINGS (VSS=0V; Note 1) Parameter Symbol min Power Supply AVDD, DVDD -0.3 Input Current (any pins except for supplies) IIN Input Voltage VIND -0.3 Ambient Operating Temperature Ta -20 Storage Temperature Tstg -65
Note 1. All voltages with respect to ground.
max 6.0 10 DVDD+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 AVDD, DVDD min 4.5 typ 5.0 max 5.5 Units V
(Note 2)
Note 2. The power up sequence between AVDD and DVDD is not critical. *AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
MS0429-E-00 -3-
2005/09
ASAHI KASEI
[AK4387]
ANALOG CHARACTERISTICS (Ta=25C; AVDD=DVDD=5.0V; fs=44.1kHz; BICK=64fs; Signal Frequency=1kHz; 24bit Input Data; Measurement frequency=20Hz 20kHz; RL 5k; External circuit: Figure 9 (Example 2); unless otherwise specified) Parameter min Typ max Units Resolution 24 Bits Dynamic Characteristics (Note 3) THD+N fs=44.1kHz 0dBFS -90 -80 dB BW=20kHz -60dBFS -42 dB fs=96kHz 0dBFS -90 dB BW=40kHz -60dBFS -39 dB fs=192kHz 0dBFS -85 dB BW=40kHz -60dBFS -39 dB Dynamic Range (-60dBFS with A-weighted) (Note 4) 98 106 dB S/N (A-weighted) (Note 5) 98 106 dB Interchannel Isolation (1kHz) 90 100 dB Interchannel Gain Mismatch 0.2 0.5 dB DC Accuracy Gain Drift 100 ppm/C Output Voltage (Note 6) 2.75 2.95 3.15 Vpp Load Resistance (Note 7) 5 k Load Capacitance 25 pF Power Supplies Power Supply Current (AVDD+DVDD) 17 27 mA Normal Operation (RSTN pin = "H", fs96kHz) 20 32 mA Normal Operation (RSTN pin = "H", fs=192kHz) 60 150 A Power-Down Mode (RSTN pin = "L") (Note 8) Note 3. Measured by Audio Precision (System Two). Refer to the evaluation board manual. Note 4. 100dB at 16bit data. Note 5. S/N does not depend on input bit length. Note 6. Full-scale voltage (0dB). Output voltage scales with the voltage of AVDD, AOUT (typ.@0dB) = 2.95Vpp x AVDD/5. Note 7. For AC-load. Note 8. All digital inputs including clock pins (MCLK, BICK and LRCK) are held AVDD, DVDD or VSS. SHARP ROLL-OFF FILTER CHARACTERISTICS (Ta = 25C; AVDD=DVDD = 4.5 5.5V; fs = 44.1kHz; DEM = OFF) 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 + LPF Frequency Response 20.0kHz fs=44.1kHz FR dB 0.03 40.0kHz fs=96kHz FR dB 0.03 80.0kHz fs=192kHz FR dB 0.03 Note 9. The passband and stopband frequencies scale with fs(system sampling rate). For example, PB=0.4535xfs (@0.05dB), SB=0.546xfs. Note 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.
MS0429-E-00 -4-
2005/09
ASAHI KASEI
[AK4387]
DC CHARACTERISTICS (Ta=25C; AVDD=DVDD=4.5 5.5V) Parameter Symbol min High-Level Input Voltage VIH 2.2 Low-Level Input Voltage VIL High-Level Output Voltage (Iout=-80A) VOH AVDD-0.4 Low-Level Output Voltage (Iout=80A) VOL Input Leakage Current Iin -
typ -
max 0.8 0.4 10
Units V V V V A
SWITCHING CHARACTERISTICS (Ta=25C; AVDD=DVDD=4.5 5.5V, CL = 20pF) Parameter Symbol min typ fCLK 2.048 11.2896 Master Clock Frequency Duty Cycle dCLK 40 LRCK Frequency Normal Speed Mode fsn 8 Double Speed Mode fsd 60 Quad Speed Mode fsq 120 Duty Cycle Duty 45 Audio Interface Timing BICK Period Normal Speed Mode tBCK 1/128fs Double/Quad Speed Mode tBCK 1/64fs BICK Pulse Width Low tBCKL 30 Pulse Width High tBCKH 30 BICK rising to LRCK Edge (Note 11) tBLR 20 LRCK Edge to BICK rising (Note 11) tLRB 20 SDTI Hold Time tSDH 20 SDTI Setup Time tSDS 20 Control Interface Timing CCLK Period tCCK 200 CCLK Pulse Width Low tCCKL 80 Pulse Width High tCCKH 80 CDTI Setup Time tCDS 40 CDTI Hold Time tCDH 40 CSN "H" Time tCSW 150 tCSS 50 CSN "" to CCLK "" tCSH 50 CCLK "" to CSN "" Reset Timing RSTN Pulse Width (Note 12) tPD 150 Note 11. BICK rising edge must not occur at the same time as LRCK edge. Note 12. The AK4387 can be reset by bringing RSTN pin = "L".
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
MS0429-E-00 -5-
2005/09
ASAHI KASEI
[AK4387]
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
Serial Interface Timing
MS0429-E-00 -6-
2005/09
ASAHI KASEI
[AK4387]
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
RSTN
VIL
Power-down Timing
MS0429-E-00 -7-
2005/09
ASAHI KASEI
[AK4387]
OPERATION OVERVIEW System Clock
The external clocks, which are required to operate the AK4387, 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 bit = "0": Register 00H), the sampling speed is set by DFS0/1(Table 1). The frequency of MCLK at each sampling speed is set automatically. (Table 2~4). After exiting reset (RSTN pin = ""), the AK4387 is in Auto Setting Mode. In Auto Setting Mode (ACKS bit = "1": Default), as MCLK frequency is detected automatically (Table 5), and the internal master clock becomes the appropriate frequency (Table 6), it is not necessary to set DFS0/1. All external clocks (MCLK, BICK and LRCK) should always be present whenever the AK4387 is in the normal operation mode (RSTN pin = "H"). If these clocks are not provided, the AK4387 may draw excess current and may fall into unpredictable operation. This is because the device utilizes dynamic refreshed logic internally. The AK4387 should be reset by RSTN pin = "L" after threse clocks are provided. If the external clocks are not present, the AK4387 should be in the power-down mode (RSTN pin = "L"). After exiting reset at power-up etc., the AK4387 is in the power-down mode until MCLK and LRCK are 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 1. Sampling Speed (Manual Setting Mode)
LRCK fs 32.0kHz 44.1kHz 48.0kHz
256fs 8.1920MHz 11.2896MHz 12.2880MHz
384fs 12.2880MHz 16.9344MHz 18.4320MHz
MCLK 512fs 16.3840MHz 22.5792MHz 24.5760MHz
768fs 24.5760MHz 33.8688MHz 36.8640MHz
1152fs 36.8640MHz N/A N/A
BICK 64fs 2.0480MHz 2.8224MHz 3.0720MHz
Table 2. System Clock Example (Normal Speed Mode @Manual Setting Mode)
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 3. System Clock Example (Double Speed Mode @Manual Setting Mode)
MS0429-E-00 -8-
2005/09
ASAHI KASEI
[AK4387]
LRCK fs 176.4kHz 192.0kHz
MCLK 128fs 192fs 22.5792MHz 33.8688MHz 24.5760MHz 36.8640MHz
BICK 64fs 11.2896MHz 12.2880MHz
Table 4. System Clock Example (Quad Speed Mode @Manual Setting Mode)
MCLK 1152fs 512fs 256fs 128fs 768fs 384fs 192fs
Sampling Speed Normal (fs32kHz) Normal Double Quad
Table 5. Sampling Speed (Auto Setting Mode: Default)
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
256fs 22.5792 24.5760 -
MCLK (MHz) 384fs 512fs 16.3840 22.5792 24.5760 33.8688 36.8640 -
768fs 24.5760 33.8688 36.8640 -
1152fs 36.8640 -
Sampling Speed Normal Double Quad
Table 6. System Clock Example (Auto Setting Mode)
Audio Serial Interface Format
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 7. Audio Data Formats
MS0429-E-00 -9-
2005/09
ASAHI KASEI
[AK4387]
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
Don't care 19:MSB, 0:LSB
19 0
Don't care
19
0
SDTI Mode 4
Don't care
23
22
21
20
19
0
Don't care
23
22
21
20
19
0
23:MSB, 0:LSB
Lch Data
Figure 2. Mode 1,4 Timing
Rch Data
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
MS0429-E-00 - 10 -
2005/09
ASAHI KASEI
[AK4387]
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
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 AK4387 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. The transition time of 1 level and all 256 levels is shown in Table 10. 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 9. ATT Transition Time
MS0429-E-00 - 11 -
2005/09
ASAHI KASEI
[AK4387]
Zero Detection
The AK4387 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 pin of both channels go to "L" at 2~3/fs after RSTN bit returns to "1". 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.
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 9) 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 9). 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 5. Soft Mute and Zero Detection
MS0429-E-00 - 12 -
2005/09
ASAHI KASEI
[AK4387]
System Reset
The AK4387 should be reset once by bringing RSTN pin = "L" upon power-up. The AK4387 is powered up and the internal timing starts clocking by LRCK "" after exiting reset and power down state by MCLK. The AK4387 is in the power-down mode until MCLK and LRCK are input.
Power-down
The AK4387 is placed in the power-down mode by bringing RSTN pin "L" and the anlog outputs become VCOM voltage (AVDD/2). Figure 6 shows an example of the system timing at the power-down and power-up.
RSTN
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
DZF External MUTE
(6)
(5)
Mute ON
Notes: (1) The analog output corresponding to digital input has the group delay (GD). (2) Analog outputs are VCOM voltage (AVDD/2) at the power-down mode. (3) Click noise occurs at the edge of RSTN 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 (RSTN pin = "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 pin is "L" in the power-down mode (RSTN pin = "L"). Figure 6. Power-down/up Sequence Example
MS0429-E-00 - 13 -
2005/09
ASAHI KASEI
[AK4387]
Reset Function
When RSTN bit =0, DAC is powered down but the internal register values are not initialized. The analog outputs go to VCOM voltage and DZF pins go to "H". Figure 7 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 (AVDD/2). (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 pin = "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 bit "1". Figure 7. Reset Sequence Example
MS0429-E-00 - 14 -
2005/09
ASAHI KASEI
[AK4387]
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). AK4387 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).
RSTN pin = "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 8. Control I/F Timing *The AK4387 does not support the read command and chip address. C1/0 and R/W are fixed to "011" *When the AK4387 is in the power down mode (RSTN pin = "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 RSTN 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". The "0" register should be written "0", the "1" register should be written "1" data. Register Name Control 1 Control 2 Control 3 Lch ATT Rch ATT D7 ACKS DZFE 0 ATT7 ATT7 D6 0 1 0 ATT6 ATT6 D5 0 0 0 ATT5 ATT5 D4 DIF2 DFS1 INVL ATT4 ATT4 D3 DIF1 DFS0 INVR ATT3 ATT3 D2 DIF0 DEM1 DZFB ATT2 ATT2 D1 PW DEM0 0 ATT1 ATT1 D0 RSTN SMUTE 0 ATT0 ATT0
MS0429-E-00 - 15 -
2005/09
ASAHI KASEI
[AK4387]
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 click noise can be reduced by 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 7) Initial: "010", Mode 2 ACKS: Master Clock Frequency Auto Setting Mode Enable 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 1 0
D5 0 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 8) Initial: "01", OFF DFS1-0: Sampling speed control 00: Normal speed 01: Double speed 10: Quad speed When changing between Normal/Double Speed Mode and Quad Speed Mode, some click noise occurs. 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".
MS0429-E-00 - 16 -
2005/09
ASAHI KASEI
[AK4387]
Register Name 02H Control 3 default
D7 0 0
D6 0 0
D5 0 0
D4 INVL 0
D3 INVR 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 INVR: Inverting Lch Output Polarity 0: Normal Output 1: Inverted Output INVL: Inverting Rch Output Polarity 0: Normal Output 1: Inverted Output
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 log10 (ATT_DATA / 255) [dB] 00H: Mute
MS0429-E-00 - 17 -
2005/09
ASAHI KASEI
[AK4387]
SYSTEM DESIGN
Figure 9 and 10 show the system connection diagram. An evaluation board (AKD4387) is available in order to allow an easy study on the layout of a surrounding circuit.
Master Clock
64fs 24bit Audio Data fs Reset & Power down
1 2 3 4 5 6
MCLK BICK SDTI LRCK RSTN CSN CCLK CDTI
DZF DVDD AVDD
16
10
Optional External Mute Circuits
15
0.1u
14
0.1u
+
10u
Analog Supply 5V
AK4387
VSS VCOM AOUTL AOUTR NC
13
10u
12 11 10 9
+
Lch Out
Mode Setting
7 8
Rch Out
Digital Ground
Analog Ground
Figure 9. Typical Connection Diagram (Example 1)
Master Clock
64fs 24bit Audio Data fs Reset & Power down
1 2 3 4 5 6
MCLK BICK SDTI LRCK RSTN CSN CCLK CDTI
DZF DVDD AVDD
16 15 14
0.1u +
Optional External Mute Circuits
10u
Analog Supply 5V
AK4387
VSS VCOM AOUTL AOUTR NC
13
10u
12 11 10 9
+
Lch Out
Mode Setting
7 8
Rch Out
Digital Ground
Analog Ground
Figure 10. Typical Connection Diagram (Example 2) 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 should not be left floating. - THD+N value at 192kHz decreases by around 3dB when using Example 2.
MS0429-E-00 - 18 -
2005/09
ASAHI KASEI
[AK4387]
1. Grounding and Power Supply Decoupling
AVDD, DVDD 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 AVDD, DVDD as possible. The differential Voltage between AVDD and VSS pins set the analog output range.
2. Analog Outputs
The analog outputs are single-ended and centered around the VCOM voltage. The output signal range is typically 2.95Vpp (typ@AVDD=5V). The phase of the analog outputs can be inverted channel independently by INVL/INVR bits. The internal switched-capacitor filter and continuous-time filter attenuate the noise generated by the delta-sigma modulator beyond the audio passband. The output voltage is a positive full scale for 7FFFFFH (@24bit) and a negative full scale for 800000H (@24bit). The ideal output is VCOM voltage for 000000H (@24bit). DC offsets on analog outputs are eliminated by AC coupling since analog outputs have DC offsets of VCOM + a few mV. Figure 11 shows an example of the external LPF with 2Vrms output.
390p
3.3k
3.3k
+Vop
22u 3.0k 3.9k
AOUT
22k 470p
Analog Out
-Vop
fc=108.6kHz, Q=0.706, g=-0.08dB at 40kHz
Figure 11. External 2nd order LPF Circuit Example (using op-amp with dual power supplies)
MS0429-E-00 - 19 -
2005/09
ASAHI KASEI
[AK4387]
PACKAGE
16pin TSSOP (Unit: mm)
*5.00.1 1.050.05
16
9 *4.40.1 A 6.40.2 0.170.05 Detail A 0.10.1 0-10 0.50.2 0.10
Epoxy Cu Solder (Pb free) plate 2005/09 - 20 -
1 0.220.1
8 0.65
0.13 M
Seating Plane
NOTE: Dimension "*" does not include mold flash.
Package & Lead frame material
Package molding compound: Lead frame material: Lead frame surface treatment:
MS0429-E-00
ASAHI KASEI
[AK4387]
MARKING
AKM 4387ET XXYYY
1) 2)
3) 4)
Pin #1 indication Date Code : XXYYY (5 digits) XX: Lot# YYY: Date Code Marketing Code : 4387ET Asahi Kasei Logo
Revision History
Date (YY/MM/DD) 05/09/30 Revision 00 Reason First Edition Page Contents
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 dev ices or systems containing them, may require an export license or other official approv al under the law and regulations of the country of export pertaining to customs and tariff s, 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 dev ice or system, and AKM assumes no responsibility relating to any such use, except with the express written consent of the Representativ e Director of AKM. As used here: (a) A hazard related device or system is one designed or intended for lif e 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 saf ety or effectiveness of the dev ice or system containing it, and which must therefore meet v ery 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 adv ance of the abov e 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.
MS0429-E-00 - 21 -
2005/09

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