WM8944BECSSLASHR datasheet(24/165 Pages) CIRRUS

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WM8944B

Rev 4.3

INPUT PGA GAIN CONTROL

The volume control gain for the PGA is adjusted using the INPGA_VOL register field as described in

Table 4. The gain range is -12dB to +35.25dB in 0.75dB steps. The gains on the inverting and non-

inverting inputs to the PGA are always equal. The input PGA can be muted using the INPGA_MUTE

mute bit.

To prevent "zipper noise", a zero-cross function is provided on the input PGA. When this feature is

enabled, volume updates will not take place until a zero-crossing is detected. The Input PGA volume

control register fields are described in Table 4.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R40 (28h)

Input PGA gain

ctrl

INPGA_ZC

Input PGA Zero Cross Detector

0 = Change gain immediately

1 = Change gain on zero cross only

INPGA_MUTE

Input PGA Mute

0 = Disable Mute

1 = Enable Mute

5:0

INPGA_VOL

[5:0]

01_0000

(0dB)

Input PGA Volume

00_0000 = -12dB

00_0001 = -11.25dB

…

01_0000 = 0dB

...

11_1111 = +35.25

(See Table 5 for volume range)

Table 4 Input PGA Volume Control

WM8944BECS/R 数据表(PDF) 24 Page - Cirrus Logic

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