WM8983 datasheet(37/129 Pages) CIRRUS

37 / 129 page

WM8983

Rev 4.6

The input PGA paths can have a +20dB boost (PGABOOSTL/R=1) , a 0dB pass through

(PGABOOSTL/R=0) or be completely isolated from the input boost circuit (INPPGAMUTEL/R=1).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R47

Left Input

BOOST

control

PGABOOSTL

Boost enable for left channel input

PGA:

0 = PGA output has +0dB gain through

input BOOST stage.

1 = PGA output has +20dB gain

through input BOOST stage.

R48

Right Input

BOOST

control

PGABOOSTR

Boost enable for right channel input

PGA:

0 = PGA output has +0dB gain through

input BOOST stage.

1 = PGA output has +20dB gain

through input BOOST stage.

Table 8 Input BOOST Stage Control

The Auxiliary amplifier path to the BOOST stages is controlled by the AUXL2BOOSTVOL[2:0] and

AUXR2BOOSTVOL[2:0] register bits. When AUXL2BOOSTVOL/AUXR2BOOSTVOL=000, this path is

completely disconnected from the BOOST stage. Settings 001 through to 111 control the gain in 3dB

steps from -12dB to +6dB.

The L2/R2 path to the BOOST stage is controlled by the L2_2BOOSTVOL[2:0] and the

R2_2BOOSTVOL[2:0] register bits.

When L2_2BOOSTVOL/R2_2BOOSTVOL=000, the L2/R2 input

pin is completely disconnected from the BOOST stage. Settings 001 through to 111 control the gain

in 3dB steps from -12dB to +6dB.

The OUT4 mixer path to the BOOST stage is controlled by the OUT4_2ADCVOL[2:0] and

OUT4_2LNR register bits. The OUT4 mixer signal can be routed to the Left Boost or the Right Boost

stage, but not both at the same time.

When OUT4_2ADCVOL=000, the OUT4 mixer path is

completely disconnected from the BOOST stage.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R42

OUT4 to ADC

8:6

OUT4_2ADCVOL

000

Controls the OUT4 to ADC input

boost stage:

000 = Path disabled

(disconnected)

001 = -12dB gain

010 = -9dB gain

011 = -6dB gain

100 = -3dB gain

101 = +0dB gain

110 = +3dB gain

111 = +6dB gain

OUT4_2LNR

OUT4 to L or R ADC input

0 = Right ADC input

1 = Left ADC input

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