ASAHI KASEI
[AK4626A]
MS0397-E-00
2005/06
- 1 -
GENERAL DESCRIPTION
The AK4626A is a single chip CODEC that includes two channels of ADC and six channels of DAC. The
ADC outputs 24bit data and the DAC accepts up to 24bit input data. The ADC has the Enhanced Dual Bit
architecture with wide dynamic range. The DAC introduces the newly developed Advanced Multi-Bit
architecture, and achieves wider dynamic range and lower outband noise. An auxiliary digital audio input
interface maybe used instead of the ADC for passing audio data to the primary audio output port. Control
may be set directly by pins or programmed through a separate serial interface.
The AK4626A has a dynamic range of 102dB for ADC, 106dB for DAC and is well suited for digital
surround for home theater and car audio. An AC-3 system can be built with a IEC60958(SPDIF) receiver
such as the AK4112B. The AK4626A is available in a small 44pin LQFP package which will reduce
system space.
*AC-3 is a trademark of Dolby Laboratories.
FEATURES
2ch 24bit ADC
- 64x Oversampling
- Sampling Rate up to 96kHz
- Linear Phase Digital Anti-Alias Filter
- Single-Ended Input
- S/(N+D): 92dB
- Dynamic Range, S/N: 102dB
- Digital HPF for offset cancellation
- I/F format: MSB justified, I
2
S or TDM
- Overflow flag
6ch 24bit DAC
- 128x Oversampling
- Sampling Rate up to 192kHz
- 24bit 8 times Digital Filter
- Single-Ended Outputs
- On-chip Switched-Capacitor Filter
- S/(N+D): 90dB
- Dynamic Range, S/N: 106dB
- I/F format: MSB justified, LSB justified(20bit,24bit), I
2
S or TDM
- Individual channel digital volume with 128 levels and 0.5dB step
- Soft mute
- De-emphasis for 32kHz, 44.1kHz and 48kHz
- Zero Detect Function
High Jitter Tolerance
TTL Level Digital I/F
3-wire Serial and I
2
C Bus P I/F for mode setting
Master clock:256fs, 384fs or 512fs for fs=32kHz to 48kHz
128fs, 192fs or 256fs for fs=64kHz to 96kHz
128fs for fs=120kHz to 192kHz
Power Supply: 4.5 to 5.5V
Power Supply for output buffer: 2.7 to 5.5V
Small 44pin LQFP
AK4626 Pin Compatible
High Performance Multi-channel Audio CODEC
AK4626A
ASAHI KASEI
[AK4626A]
MS0397-E-00
2005/06
- 5 -
PIN/FUNCTION
No. Pin
Name
I/O
Function
1
SDOS
I
SDTO Source Select Pin (Note 1)
"L": Internal ADC output, "H": DAUX input
SDOS pin should be set to "L" when TDM= "1".
2
I2C
I
Control Mode Select Pin
"L": 3-wire Serial, "H": I
2
C Bus
3
SMUTE
I
Soft Mute Pin (Note 1)
When this pin goes to "H", soft mute cycle is initialized.
When returning to "L", the output mute releases.
4
BICK
I
Audio Serial Data Clock Pin
5
LRCK
I
Input Channel Clock Pin
6
SDTI1
I
DAC1 Audio Serial Data Input Pin
7
SDTI2
I
DAC2 Audio Serial Data Input Pin
8
SDTI3
I
DAC3 Audio Serial Data Input Pin
9
SDTO
O
Audio Serial Data Output Pin
10 DAUX
I
AUX Audio Serial Data Input Pin
11 DFS0
I
Double Speed Sampling Mode Pin (Note 1)
"L": Normal Speed, "H": Double Speed
12 TST1
I Test
Pin
This pin should be connected to DVSS.
13 DZFE
I
Zero Input Detect Enable Pin
"L": mode 7 (disable) at parallel mode,
zero detect mode is selectable by DZFM3-0 bits at serial mode
"H": mode 0 (DZF1 is AND of all six channels)
14 TVDD
- Output Buffer Power Supply Pin, 2.7V
5.5V
15 DVDD
- Digital Power Supply Pin, 4.5V
5.5V
16 DVSS
-
Digital Ground Pin, 0V
17 PDN
I
Power-Down & Reset Pin
When "L", the AK4626A is powered-down and the control registers are reset to default
state. If the state of P/S or CAD1-0 changes, then the AK4626A must be reset by PDN.
18 TST2
I Test
Pin
This pin should be connected to DVSS.
19 CAD1
I
Chip Address 1 Pin
20 CAD0
I
Chip Address 0 Pin
21 TST3
O Test
Pin
This pin should be left floating.
22 TST4
O Test
Pin
This pin should be left floating.
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