WM8956GEFL/V(2007) Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

Número de pieza

componentes Descripción

Fabricante

WM8956GEFL/V
(Rev.:2007)

Hi-Fi DAC with 1W Stereo Class D Speaker Drivers and Headphone Drivers

Wolfson Microelectronics plc 

Preliminary Technical Data

WM8956

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.

REGISTER

ADDRESS

R32 (20h)

Left Input

Signal Path

BIT

5:4

LABEL

LMICBOOST

[1:0]

R33 (21h)

5:4

Right Input

Signal Path

RMICBOOST

[1:0]

Table 5 Microphone PGA Boost Control

DEFAULT

00

00

DESCRIPTION

Left Channel Input PGA Boost Gain

00 = +0dB

01 = +13dB

10 = +20dB

11 = +29dB

Right Channel Input PGA Boost

Gain

00 = +0dB

01 = +13dB

10 = +20dB

11 = +29dB

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

Table 6.

REGISTER

ADDRESS

R43 (2Bh)

Input Boost

Mixer 1

BIT

6:4

LABEL

LIN3BOOST

[2:0]

3:1

LIN2BOOST

[2:0]

R44 (2Ch)

6:4

Input Boost

Mixer 2

RIN3BOOST

[2:0]

3:1

RIN2BOOST

[2:0]

Table 6 Line Input Boost Control

DEFAULT

DESCRIPTION

000

LINPUT3 to Boost Mixer gain

000 = Mute

001 = -12dB

...3dB steps up to

111 = +6dB

000

LINPUT2 to Boost Mixer gain

000 = Mute

001 = -12dB

...3dB steps up to

111 = +6dB

000

RINPUT3 to Boost Mixer gain

000 = Mute

001 = -12dB

...3dB steps up to

111 = +6dB

000

RINPUT2 to Boost Mixer gain

000 = Mute

001 = -12dB

...3dB steps up to

111 = +6dB

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

muted.

w

PTD, July 2007, Rev 2.1

23

Share Link: