[AK4621]
AK4621
24-Bit 192kHz Stereo Audio CODEC
GENERAL DESCRIPTION
The AK4621 is a high performance 24-bit CODEC that supports up to 192kHz recording and playback.
The on-board analog-to-digital converter has a high dynamic range due to AKM’s Enhanced Dual-Bit
architecture. The DAC utilizes AKM’s Advanced Multi-Bit architecture that achieves low out-of-band
noise and high jitter tolerance through the use of Switched Capacitor Filter (SCF) technology. The
AK4621 is ideal for Pro Audio sound cards, Digital Audio Workstations, DVD-R, hard disk, CD-R
recording/playback systems, and musical instrument recording.
FEATURES
□
24-bit 2-channel ADC
- Full Differential Inputs
- Selectable Digital Filter
1. ADC Sharp Roll Off Filter (GD=39/fs)
Passband: 0 ~ 21.8kHz (@fs=48kHz)
Stopband Attenuation: 100dB
2. ADC Short Delay Sharp Roll Off Filter (GD=14/fs)
Passband: 0 ~ 21.7kHz (@fs=48kHz)
Stopband Attenuation: 80dB
- S/(N+D): 102dB
- S/N: 115dB
- Digital High-pass Filter for Offset Cancellation
- Overflow Flag
2
- Audio Interface Format: MSB justified or I S
□ 24-bit 2-channel DAC
- Selectable Digital Filter
1. DAC Sharp Roll Off Filter (GD=27/fs)
Passband: 0 ~ 21.8kHz (@fs=48kHz)
Stopband Attenuation: 70dB
2. DAC Slow Roll Off Filter (GD=27/fs)
Passband: 0 ~ 8.9kHz (@fs=48kHz)
Stopband Attenuation: 73dB
3. DAC Short Delay Sharp Roll Off Filter (GD=7/fs)
Passband: 0 ~ 21.8kHz (@fs=48kHz)
Stopband Attenuation: 70dB
- Switched-cap Low Pass Filter
- Differential Outputs
- S/(N+D): 100dB
- S/N: 115dB
- De-emphasis for 32kHz, 44.1kHz, 48kHz Sampling
- Output Digital Attenuator: 0dB ~ – 72dB, Linear 256 + 16steps
- Zero Detection Function
2
- Audio Interface Format: MSB justified, LSB justified, I S
□
High Jitter Tolerance
□
Sampling Rate: 32kHz ~ 216kHz
□
P
Interface: 3-wire Serial Interface
□
Master Clock: 128fs/192fs/256fs/384fs/512fs/768fs/1024fs
MS1258-E-02
-1-
2017/XX
[AK4621]
□
Power Supply
Analog: 4.75 ~ 5.25V (typ. 5.0V)
Digital: 3.0 ~ 3.6V (typ. 3.3V)
Digital I/O: DVDD ~ 5.25V (typ. 5.0V)
□
Package: 30-pin VSOP
□
Ta: -10 ~ 70
C
■
Block Diagram
AVDD VSS1 VCOM VREF
DVDD TVDD VSS2
AINL+
AINL-
ADC
AINR+
AINR-
Audio
Interface
HPF
PDN
LRCK
BICK
SDTO
SDTI
MCLK
AOUTL+
AOUTL-
DAC
AOUTR+
AOUTR-
Control
Register I/F
P/S
DATT
SMUTE
DFS0
OVF
OVFL/DZFL
OVFR/DZFR
SDFIL DEM0 CSN/ CCLK/ CDTI/
DIF CKS1 CKS0
Figure 1. Block Diagram
MS1258-E-02
-2-
2017/XX
[AK4621]
■
Ordering Guide
AK4621EF
AKD4621
10
+70C
30-pin VSOP (0.65mm pitch)
Evaluation board for AK4621
■
Pin Layout
VCOM
AINR+
AINR-
AINL+
AINL-
VREF
VSS1
AVDD
P/S
MCLK
LRCK
BICK
SDTO
SDTI
OVFR/DZFR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
AOUTR+
AOUTR-
AOUTL+
AOUTL-
VSS2
DVDD
TVDD
SDFIL
DEM0
PDN
DFS0
CSN/DIF
CCLK/CKS1
CDTI/CKS0
OVFL/DZFL
Top View
MS1258-E-02
-3-
2017/XX
[AK4621]
■
Compatibility with AK4620B
1. Function
Function
Max fs
ADC Inputs
Input analog PGA
Input digital ATT
ADC S/(N+D)
ADC DR, S/N
ADC Digital Filter Type
ADC Digital Filter SA
ADC Digital Filter GD
DAC S/(N+D)
DAC DR, S/N
DAC Digital Filter Type
DAC Digital Filter SA
DAC Digital Filter GD
Output digital Attenuator
DAC DSD mode
DAC Zero-data detection
Parallel Mode
AK4620B
216kHz
Single-ended
0 ~ +18dB
0.5dB/step
Mute,-63.5dB ~ 0dB
0.5dB/step
90dB
110dB
Differential
-
Mute,-63.5dB ~ 0dB
0.5dB/step
100dB
113dB
AK4621
←
Differential
-
-
102dB
115dB
Sharp Roll-off
100dB
39/fs
Short Delay
Sharp Roll-off
80dB
14/fs
←
Sharp Roll-off
70dB
27/fs
Slow Roll-off
Short Delay
Sharp Roll-off
70dB
7/fs
Sharp Roll-off
100dB
43.2/fs
97dB (0dBFS)
115dB
Sharp Roll-off
75dB
28/fs
Mute, -48dB ~ 0dB
Linear 256 steps
X
X
X
Slow Roll-off
72dB
28/fs
Mute, -48dB ~ 0dB
Linear 256 steps
100dB (-1dBFS)
73dB
27/fs
Mute, -72dB ~ 0dB
Linear 16 + 256 steps
-
←
←
X: Available, -: Not Available
2. Register (difference from AK4620B)
Addr
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
Register Name
Power Down Control
Reset Control
Clock and Format Control
Deem and Volume Control
Reserved
Reserved
Lch DATT Control
Rch DATT Control
Lch Extension DATT Control
Rch Extension DATT Control
D7
SLOW
D/P
DIF2
SMUTE
IATTL7
IATTR7
DATTL7
DATTR7
0
0
D6
D5
D4
D3
DZFB
ZOE
ZOS
SDDA
DCKS
DCKB
SDAD
AML
DIF1
DIF0
CMODE
CKS1
HPRN
HPLN
ZCEI
ZTM1
IATTL6
IATTL5
IATTL4
IATTL3
IATTR6
IATTR5
IATTR4
IATTR3
DATTL6 DATTL5 DATTL4 DATTL3
DATTR6 DATTR5 DATTR4 DATTR3
0
EXTE
0
EATTL3
0
0
0
EATTR3
These bits were added in the AK4621.
These bits were deleted in the AK4621.
D2
PWVR
AMR
CKS0
ZTM0
IATTL2
IATTR2
DATTL2
DATTR2
EATTL2
EATTR2
D1
PWAD
RSTAD
DFS1
DEM1
IATTL1
IATTR1
DATTL1
DATTR1
EATTL1
EATTR1
D0
PWDA
RSTDA
DFS0
DEM0
IATTL0
IATTR0
DATTL0
DATTR0
EATTL0
EATTR0
MS1258-E-02
-4-
2017/XX
[AK4621]
PIN/FUNCTION
No.
1
Pin Name
VCOM
I/O
O
Function
Common Voltage Output Pin, (AVDD)/2
Bias voltage of ADC inputs and DAC outputs.
2
AINR+
I
Rch Positive Input Pin
3
AINR-
I
Rch Negative Input Pin
4
AINL+
I
Lch Positive Input Pin
5
AINL-
I
Lch Negative Input Pin
Voltage Reference Input Pin, AVDD
6
VREF
I
Used as a voltage reference by ADC & DAC. VREF is connected externally to AVDD.
7
VSS1
-
Analog Ground Pin
8
AVDD
-
Analog Power Supply Pin, 4.75
5.25V
Parallel/Serial Mode Select Pin
9
P/S
I
“L”: Serial Mode, “H”: Parallel Mode
Do not change this pin during PDN pin = “H”.
10 MCLK
I
Master Clock Input Pin
11 LRCK
I
Input/Output Channel Clock Pin
12 BICK
I
Audio Serial Data Clock Pin
13 SDTO
O
Audio Serial Data Output Pin
14 SDTI
I
Audio Serial Data Input Pin
OVFR
O
Rch Over Flow Flag Pin (in Parallel mode or when ZOS bit=“0” in Serial Mode)
15
DZFR
O
Rch Zero Detection Flag Pin (when ZOS bit=“1” in Serial Mode)
OVFL
O
Lch Over Flow Flag Pin (in Parallel mode or when ZOS bit=“0” in Serial Mode)
16
DZFL
O
Lch Zero Detection Flag Pin (when ZOS bit=“1” in Serial Mode)
CDTI
I
Control Data Input Pin (in Serial Mode)
17
CKS0
I
Master Clock Select Pin (in Parallel Mode)
CCLK
I
Control Data Clock Pin (in Serial Mode)
18
CKS1
I
Master Clock Select Pin (in Parallel Mode)
CSN
I
Chip Select Pin in Serial Mode (in Serial Mode)
19
Digital Audio Interface Select Pin (in Parallel Mode)
DIF
I
“L”: 24bit MSB justified, “H”: I2S compatible
20 DFS0
I
Double Speed Sampling Mode Pin
Power-Down Mode Pin
21 PDN
I
“L”: Power down reset and initialize the control register, “H”: Power up
22 DEM0
I
De-emphasis Control Pin
Digital Filter Select Pin
23 SDFIL
I
“L”: Short Delay Sharp Roll Off Filter (ADC), Short Delay Sharp Roll Off Filter (DAC)
“H”: Sharp Roll Off Filter (ADC), Sharp Roll Off Filter (DAC)
24 TVDD
-
Digital I/O Power Supply Pin, DVDD
5.25V
25 DVDD
-
Digital Power Supply Pin, 3.0
3.6V
26 VSS2
-
Digital Ground Pin
27 AOUTL-
O
Lch Negative Analog Output Pin
28 AOUTL+
O
Lch Positive Analog Output Pin
29 AOUTR-
O
Rch Negative Analog Output Pin
30 AOUTR+
O
Rch Positive Analog Output Pin
Note 1. All digital input pins (P/S, MCLK, LRCK, BICK, SDTI, CDTI/CKS0, CCLK/CKS1, CSN/DIF, DFS0, PDN,
DEM0 and SDFIL) must not be left floating.
MS1258-E-02
-5-
2017/XX
