WM8956CGEFLSLASHV datasheet(22/80 Pages) WOLFSON

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WM8956

Production Data

PD, November 2011, Rev 4.1

LINE INPUTS

Two pairs of stereo line inputs (LINPUT2 / RINPUT2 and LINPUT3 / RINPUT3) are available as

analogue inputs into the output mixers via the bypass paths.

See "Output Signal Path" for more information on the bypass paths.

INPUT BOOST

The boost stage in the input path can mix signals from the microphone PGAs and the line inputs.

The boost stage can provide up to +29dB additional gain from the microphone PGA output, providing

a total maximum available analogue gain of +59dB from microphone to output mixers. The

microphone PGA path to the boost mixer is muted using LINMUTE and RINMUTE as shown in Table

4. Microphone PGA to boost gain settings are shown in Table 5.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R32 (20h)

Left Input

Signal Path

5:4

LMICBOOST

[1:0]

Left Channel Input PGA Boost Gain

00 = +0dB

01 = +13dB

10 = +20dB

11 = +29dB

R33 (21h)

Right Input

Signal Path

5:4

RMICBOOST

[1:0]

Right Channel Input PGA Boost

Gain

00 = +0dB

01 = +13dB

10 = +20dB

11 = +29dB

Table 5 Microphone PGA Boost Control

For line inputs, -12dB to +6dB gain is available on the boost mixer, with mute control, as shown in

Table 6.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R43 (2Bh)

Input Boost

Mixer 1

6:4

LIN3BOOST

[2:0]

000

LINPUT3 to Boost Mixer gain

000 = Mute

001 = -12dB

...3dB steps up to

111 = +6dB

3:1

LIN2BOOST

[2:0]

000

LINPUT2 to Boost Mixer gain

000 = Mute

001 = -12dB

...3dB steps up to

111 = +6dB

R44 (2Ch)

Input Boost

Mixer 2

6:4

RIN3BOOST

[2:0]

000

RINPUT3 to Boost Mixer gain

000 = Mute

001 = -12dB

...3dB steps up to

111 = +6dB

3:1

RIN2BOOST

[2:0]

000

RINPUT2 to Boost Mixer gain

000 = Mute

001 = -12dB

...3dB steps up to

111 = +6dB

Table 6 Line Input Boost Control

When all three input paths to the boost mixer are disabled, the boost mixer will automatically be

muted.

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