AK4342 Datasheet, PDF (20/43 Pages) Asahi Kasei Microsystems – 24-Bit Stereo DAC with HP-AMP & 2V Line-Out

ASAHI KASEI
[AK4342]
„ Digital Volume
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.
ATTL7-0 bits
ATTR7-0 bits
ATT (dB)
FFH
•
20 log₁₀ (ATT_DATA / 255)
01H
00H
Mute
Table 6. Digital Volume Gain Table
Default
STS1 bit STS0 bit
0
0
0
1
1
0
1
1
Sampling Speed
Transition Time
1 Level
255 to 0
Half Speed Mode
1LRCK
255LRCK
Normal Speed Mode
2LRCK
510LRCK
Double Speed Mode
4LRCK
1020LRCK
Half Speed Mode
2LRCK
510LRCK
Normal Speed Mode
4LRCK
1020LRCK
Double Speed Mode
8LRCK
2040LRCK
Half Speed Mode
4LRCK
1020LRCK
Normal Speed Mode
8LRCK
2040LRCK
Double Speed Mode
16LRCK
4080LRCK
Half Speed Mode
8LRCK
2040LRCK
Normal Speed Mode
16LRCK
4080LRCK
Double Speed Mode
32LRCK
8160LRCK
Table 7. Transition Time for Digital Volume
Default
MS0506-E-02
- 20 -
2006/07