WM8962B datasheet(107/295 Pages) WOLFSON

107 / 295 page

WM8962

Rev 4.3

107

DAC CLOCKING CONTROL

Clocking for the DACs is derived from SYSCLK. The required clock is enabled when the

SYSCLK_ENA register is set.

The DAC clock rate is configured automatically, according to the SAMPLE_RATE and MCLK_RATE

registers. See “Clocking and Sample Rates” for further details of the system clocks and associated

control registers.

Note that the DAC and the DAC signal path enhancements functions are only supported under

specific clocking configurations. The valid clocking ratios for DAC operation are identified in Table 96.

See also Table 97 for details of the supported functions for different MCLK / fs ratios.

DAC DIGITAL VOLUME CONTROL

The output level (digital volume) of each DAC can be controlled digitally over a range from -71.625dB

to +23.625dB in 0.375dB steps. The level of attenuation for an eight-bit code X is given by:

0.375

 (X-192) dB for 1  X  255;

MUTE for X = 0

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

DACL_VOL or DACR_VOL control data will be loaded into the respective control register, but will not

actually change the digital gain setting. Both left and right gain settings are updated when a 1 is

written to DAC_VU. This makes it possible to update the gain of both channels simultaneously.

See "DAC Digital Volume Control" section for a description of the volume update function, the zero

cross function and the timeout operation.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

Left DAC

volume

DAC_VU

N/A

DAC Volume Update

Writing a 1 to this bit will cause left

and right DAC volume to be updated

simultaneously

7:0

DACL_VOL

[7:0]

C0h

(0dB)

Left DAC Digital Volume Control

00h = Digital Mute

01h = -71.625dB

02h = -71.250dB

... 0.375dB steps up to

C0h = 0dB (default)

….

FFh = 23.625dB

(See Table 62 for volume range)

R11 (0Bh)

Right DAC

volume

DAC_VU

N/A

DAC Volume Update

Writing a 1 to this bit will cause left

and right DAC volume to be updated

simultaneously

7:0

DACR_VOL

[7:0]

C0h

(0dB)

Right DAC Digital Volume Control

00h = Digital Mute

01h = -71.625dB

02h = -71.250dB

... 0.375dB steps up to

C0h = 0dB (default)

….

FFh = 23.625dB

(See Table 62 for volume range)

Table 61 Digital Volume Control

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