AK7735EQ Datasheet, PDF (102/142 Pages) Asahi Kasei Microsystems – Dual DSP with 4chADC + 4chDAC + 4chSRC

[AK7735]
■ DAC Block
1. DAC Digital Volume
The AK7735 has channel-independent digital volume controls in DAC block. (256 levels, 0.5 steps)
DAC1 Lch
VOLDA1L[7:0]
00h
01h
02h
:
17h
18h
19h
:
FDh
FEh
FFh
DAC1 Rch
DAC2 Lch
DAC2 Rch
VOLDA1R[7:0] VOLDA2L[7:0] VOLDA2R[7:0]
00h
00h
00h
01h
01h
01h
02h
02h
02h
:
:
:
17h
17h
17h
18h
18h
18h
19h
19h
19h
:
:
:
FDh
FDh
FDh
FEh
FEh
FEh
FFh
FFh
FFh
Table 56. DAC Digital Volume Setting
Attenuation
Level
+12.0dB
+11.5dB
+11.0dB
:
+0.5dB
0.0dB
-0.5dB
:
-114.5dB
-115.0dB
Mute (-∞)
(default)
Transition time between set values can be selected by ATSPDA bit.
MODE ATSPDA Transition Time
0
0
4/fs
(default)
1
1
16/fs
Table 57. DAC Volume Transition Time Setting
The transition between set values is soft transition. It takes 1020/fs (21.3ms@fs=48kHz) from 00h to FFh
(MUTE) in Mode 0. If the PDN pin is set to “L”, the VOLDA1L[7:0], VOLDA1R[7:0], VOLDA2L[7:0] and
VOLDA2R[7:0] bits are initialized to 18h.
ATSPDA bit
0
1
00h ↔ FFh Transition Time
LRCK Cycle fs=48kHz fs=44.1kHz fs=8kHz
1020/fs
21.3ms
23.1ms 127.5ms
1020/fs x4
85.0ms
92.5ms 510.0ms
Table 58. DAC Volume Transition Time (00h ↔ FFh)
(default)
016014707-E-00
- 102 -
2016/12