ak4342 AKM Semiconductor, Inc., ak4342 Datasheet - Page 20

• Manufacturer Part Number: ak4342
• Description: 24-bit Stereo Dac With Hp-amp & 2v Line-out
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The AK4342 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. Changing levels are
executed via soft changes without any pop noise. The transition time of 1 level and all 256 levels is shown in Table 7.
At DATTC bit = “1”, ATTL7-0 bits control both Lch and Rch attenuation level, while register values of ATTL7-0 bits are
not written to ATTR7-0 bits. At DATTC bit = “0”, ATTL7-0 bits control Lch level and ATTR7-0 bits control Rch level.
MS0506-E-02
Digital Volume
STS1 bit
0
0
1
1
STS0 bit
0
1
0
1
Normal Speed Mode
Normal Speed Mode
Normal Speed Mode
Normal Speed Mode
Double Speed Mode
Double Speed Mode
Double Speed Mode
Double Speed Mode
ATTR7-0 bits
ATTL7-0 bits
Half Speed Mode
Half Speed Mode
Half Speed Mode
Half Speed Mode
Table 7. Transition Time for Digital Volume
Sampling Speed
FFH
01H
00H
Table 6. Digital Volume Gain Table
•
20 log
- 20 -
10
(ATT_DATA / 255)
ATT (dB)
16LRCK
16LRCK
32LRCK
Mute
1LRCK
2LRCK
4LRCK
2LRCK
4LRCK
8LRCK
4LRCK
8LRCK
8LRCK
1 Level
Transition Time
Default
1020LRCK
1020LRCK
2040LRCK
1020LRCK
2040LRCK
4080LRCK
2040LRCK
4080LRCK
8160LRCK
255LRCK
510LRCK
510LRCK
255 to 0
Default
[AK4342]
2006/07