WM8281ECSSLASHR datasheet(56/392 Pages) CIRRUS

56 / 392 page

WM8281

Rev 4.0

INPUT SIGNAL PATH DIGITAL VOLUME CONTROL

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

control in 0.5dB steps. An independent mute control is also provided for each input 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

IN_VI_RAMP register. For decreasing gain (or mute), the rate is controlled by the IN_VD_RAMP

volume ramp is in progress.

The IN_VU bits control the loading of the input signal path digital volume and mute controls. When

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

of the input signal paths are updated when a 1 is written to IN_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 4 and Table 5.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R777

(0309h)

Input

Volume

Ramp

6:4

IN_VD_RAMP

[2:0]

010

Input 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

IN_VI_RAMP

[2:0]

010

Input 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.

R785

(0311h)

ADC

Digital

Volume 1L

IN_VU

Input Signal Paths Volume and Mute

Update

Writing a 1 to this bit will cause the Input

Signal Paths Volume and Mute settings to

be updated simultaneously

IN1L_MUTE

Input Path 1 (Left) Digital Mute

0 = Un-mute

1 = Mute

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