WM8281ECSSLASHR datasheet(186/392 Pages) CIRRUS

186 / 392 page

WM8281

186

Rev 4.0

OUTPUT SIGNAL PATH DIGITAL VOLUME CONTROL

A digital volume control is provided on each of the output signal paths, providing -64dB to +31.5dB

gain control in 0.5dB steps. An independent mute control is also provided for each output signal path.

Whenever the gain or mute setting is changed, the signal path gain is ramped up or down to the new

settings at a programmable rate. For increasing gain (or un-mute), the rate is controlled by the

OUT_VI_RAMP register. For decreasing gain (or mute), the rate is controlled by the OUT_VD_RAMP

volume ramp is in progress.

The OUT_VU bits control the loading of the output signal path digital volume and mute controls. When

OUT_VU is set to 0, the digital volume and mute settings will be loaded into the respective control

of the output signal paths are updated when a 1 is written to OUT_VU. This makes it possible to

update the gain of multiple signal paths simultaneously.

Note that, although the digital volume control registers provide 0.5dB steps, the internal circuits

provide signal gain adjustment in 0.125dB steps. This allows a very high degree of gain control, and

smooth volume ramping under all operating conditions.

The digital volume control register fields are described in Table 64 and Table 65.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1033

(0409h)

Output

Volume

Ramp

6:4

OUT_VD_RAMP

[2:0]

010

Output Volume Decreasing Ramp Rate

(seconds/6dB)

000 = 0ms

001 = 0.5ms

010 = 1ms

011 = 2ms

100 = 4ms

101 = 8ms

110 = 15ms

111 = 30ms

This register should not be changed while

a volume ramp is in progress.

2:0

OUT_VI_RAMP

[2:0]

010

Output Volume Increasing Ramp Rate

(seconds/6dB)

000 = 0ms

001 = 0.5ms

010 = 1ms

011 = 2ms

100 = 4ms

101 = 8ms

110 = 15ms

111 = 30ms

This register should not be changed while

a volume ramp is in progress.

R1041

(0411h)

DAC

Digital

Volume 1L

OUT_VU

Output Signal Paths Volume Update

Writing a 1 to this bit will cause the Output

Signal Paths Volume and Mute settings to

be updated simultaneously

OUT1L_MUTE

Output Path 1 (Left) Digital Mute

0 = Un-mute

1 = Mute

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