CDB4270 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CDB4270

24-Bit, 192 kHz Stereo Audio CODEC

Cirrus Logic 

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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

40

DS686PP1

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