WM8960CGEFLSLASHV datasheet(34/94 Pages) CIRRUS

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WM8960

Rev 4.4

DIGITAL DAC VOLUME CONTROL

The signal volume from each DAC can be controlled digitally, in the same way as the ADC volume

(see Digital ADC Volume Control). The gain and attenuation range is

–127dB to 0dB in 0.5dB steps.

The level of attenuation for an eight-bit code X is given by:

0.5

 (X-255) dB for 1  X  255;

MUTE for X = 0

The DACVU control bit controls the loading of digital volume control data. When DACVU is set to 0,

the LDACVOL or RDACVOL control data is loaded into an intermediate register, but the actual gain

does not change. Both left and right gain settings are updated simultaneously when DACVU is set to

See "Volume Updates" for more information on volume update bits.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

Left Channel

Digital Volume

DACVU

DAC Volume Update

0 = Store LDACVOL in intermediate

latch (no gain change)

1 = Update left and right channel

gains (left = LDACVOL, right =

intermediate latch)

7:0

LDACVOL

[7:0]

11111111

( 0dB )

Left DAC Digital Volume Control

0000 0000 = Digital Mute

0000 0001 = -127dB

0000 0010 = -126.5dB

... 0.5dB steps up to

1111 1111 = 0dB

R11 (0Bh)

Right Channel

Digital Volume

DACVU

DAC Volume Update

0 = Store RDACVOL in intermediate

latch (no gain change)

1 = Update left and right channel

gains (left = intermediate latch, right

= RDACVOL)

7:0

RDACVOL

[7:0]

11111111

( 0dB )

Right DAC Digital Volume Control

similar to LDACVOL

Table 15 Digital Volume Control

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