CS4270 Datasheet, PDF (39/48 Pages) Cirrus Logic – 24-Bit, 192 kHz Stereo Audio CODEC

8.7 DAC Channel A Volume Control - Address 07h
7
dacA
vol<7>
6
dacA
vol<6>
5
dacA
vol<5>
4
dacA
vol<4>
3
dacA
vol<3>
2
dacA
vol<2>
Function:
See Section 8.8 DAC Channel B Volume Control - Address 08h.
CS4270
1
dacA
vol<1>
0
dacA
vol<0>
8.8 DAC Channel B Volume Control - Address 08h
7
dacB
vol<7>
6
dacB
vol<6>
5
dacB
vol<5>
4
dacB
vol<4>
3
dacB
vol<3>
2
dacB
vol<2>
1
dacB
vol<1>
0
dacB
vol<0>
Function:
The digital volume control allows the user to attenuate the signal in 0.5 dB increments from 0 to -127 dB.
The vol<0> bit activates a 0.5 dB attenuation when set, and no attenuation when cleared. The Vol[7:1]
bits activate attenuation equal to their decimal value (in dB). Example volume settings are decoded as
shown in Table 13. The volume changes are implemented as dictated by the DACSoft and DACZero-
Cross bits in the Transition Control register (see Section 8.5.2).
Binary Code
00000000
00000001
00101000
00101001
11111110
11111111
Volume Setting
0 dB
-0.5 dB
-20 dB
-20.5 dB
-127 dB
-127.5 dB
Table 13. Digital Volume Control
DS686A1
39