WM8948ECSSLASHR datasheet(27/189 Pages) WOLFSON

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Production Data

WM8948

PD, May 2011, Rev 4.1

The Input PGA volume control register fields are described in Table 4.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R40 (28h)

Left INP PGA

gain ctrl

PGA_VU

Input PGA Volume Update

Writing a 1 to this bit will cause the

Left and Right Input PGA volumes

to be updated simultaneously.

PGAL_ZC

Left Input PGA Zero Cross Detector

0 = Change gain immediately

1 = Change gain on zero cross only

PGAL_MUTE

Left Input PGA Mute

0 = Disable Mute

1 = Enable Mute

5:0

PGAL_VOL [5:0]

01_0000

(0dB)

Left Input PGA Volume

00_0000 = -12dB

00_0001 = -11.25dB

…

01_0000 = 0dB

...

11_1111 = +35.25

(See Table 5 for volume range)

R41 (29h)

Right INP PGA

gain ctrl

PGA_VU

Input PGA Volume Update

Writing a 1 to this bit will cause the

Left and Right Input PGA volumes

to be updated simultaneously.

PGAR_ZC

Right Input PGA Zero Cross

Detector

0 = Change gain immediately

1 = Change gain on zero cross only

PGAR_MUTE

Right Input PGA Mute

0 = Disable Mute

1 = Enable Mute

5:0

PGAR_VOL

[5:0]

01_0000

(0dB)

Right 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

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