WM8985GEFLSLASHR datasheet(35/118 Pages) WOLFSON

35 / 118 page

Pre-Production

WM8985

PP, Rev 3.5, January 2007

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 (2Fh)

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 (30h)

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 LIP2BOOSTVOL[2:0] and the

RIP2BOOSTVOL[2:0] register bits.

When L2_2BOOSTVOL[6:4] and R2_2BOOSTVOL[6:4]=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.

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