AK4695 Datasheet, PDF (64/107 Pages) Asahi Kasei Microsystems – 24bit 4ch CODEC with MIC/HP/SPK/LINE-AMP

[AK4695]
■ Digital Output Volume A and B
The AK4695 has a digital output volume (256 levels including Mute, 0.5dB step). The volume can be set by the DVLA7-0
and DVLB7-0 bits. The volume is included in front of the DACA (DACB) block. The input data of DAC is changed from
+12dB to –115dB or MUTE. Both Lch and Rch attenuation levels are controlled together by DVLA7-0 bits or DVLB7-0
bits. This volume has soft transition function. Therefore no switching noise occurs during the transition. The DVTMA
(DVTMB) bit sets the transition time between set values of DVLA7-0 (DVLB7-0) bits (from 00H to FFH) as either 256/fs
or 512/fs (Table 67). When DVTMA (DVTMB) bit = “1”, it takes 512/fs (10.7ms@fs=48kHz) from 00H (MUTE) to FFH
(+12dB).
DVLA7-0 bits
DVLB7-0 bits
Gain
Step
FFH
+12.0dB
FEH
+11.5dB
FDH
+11.0dB
:
:
E7H
0dB
0.5dB _(default)
:
02H
114.5dB
01H
115.0dB
00H
Mute ( )
Table 66. Digital Output Volume A and B Setting
DVTMA bit Transition Time between DVLA7-0 bits = 00H and FFH
DVTMB bit Transition Time between DVLB7-0 bits = 00H and FFH
Setting
fs=8kHz
fs=48kHz
0
256/fs
32ms
5.3ms
1
512/fs
64ms
10.7ms
(default)
Table 67. Transition Time Setting of Digital Output Volume A and B
MS1463-E-01
- 64 -
2014/12