CS4270 datasheet(39/48 Pages) CIRRUS

39 / 48 page

DS686A1

CS4270

8.7

DAC Channel A Volume Control - Address 07h

Function:

See Section 8.8 DAC Channel B Volume Control - Address 08h.

8.8

DAC Channel B Volume Control - Address 08h

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).

432

dacA

vol<7>

dacA

vol<6>

dacA

vol<5>

dacA

vol<4>

dacA

vol<3>

dacA

vol<2>

dacA

vol<1>

dacA

vol<0>

432

dacB

vol<7>

dacB

vol<6>

dacB

vol<5>

dacB

vol<4>

dacB

vol<3>

dacB

vol<2>

dacB

vol<1>

dacB

vol<0>

Binary Code

Volume Setting

00000000

0 dB

00000001

-0.5 dB

00101000

-20 dB

00101001

-20.5 dB

11111110

-127 dB

11111111

-127.5 dB

Table 13. Digital Volume Control

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