WM9704CFTSLASHV datasheet(26/37 Pages) WOLFSON

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WM9704M

Production Data

WOLFSON MICROELECTRONICS LTD

PD Rev 3.2 January 2001

MUTE

GX4...GX0

FUNCTION

00000

+12dB gain

01000

0dB gain

11111

-34.5dB gain

xxxxx

∞dB gain

Table 12 Mixer Gain Control Register Function

RECORD SELECT CONTROL REGISTER (INDEX 1AH)

Used to select the record source independently for right and left (see Table 13). The default value is

0000h, which corresponds to Mic in.

SR2 TO SR0

RIGHT RECORD SOURCE

SL2 TO SL0

LEFT RECORD SOURCE

Mic

CD in (R)

CD in (L)

Video in (R)

Video in (L)

Aux in (R)

Aux in (L)

Line in (R)

Line in (L)

Stereo mix (R)

Stereo mix (L)

Mono mix

Phone

Table 13 Record Select Register Function

RECORD GAIN REGISTERS (INDEX 1CH AND 1EH)

1Ch is for the stereo input and 1Eh is for the optional special purpose correlated audio Mic channel.

Each step corresponds to 1.5dB. 22.5dB corresponds to 0F0Fh and 000Fh respectively. The MSB of

the register is the mute bit. When this bit is set to 1, the level for that channel(s) is set at -

∞dB.

The default value is 8000h, which corresponds to 0dB gain with mute on.

MUTE

GX3...GX0

FUNCTION

1111

+22.5dB gain

0000

0dB gain

xxxxx

∞dB gain

Table 14 Record Gain Register Function

GENERAL PURPOSE REGISTER (INDEX 20H)

This register is used to control several miscellaneous functions of the WM9704M.

Below is a summary of each bit and its function. Only the MIX, MS and LPBK bits are supported by

the WM9704M. The MS bit controls the Mic selector. The LPBK bit enables loopback of the ADC

output to the DAC input without involving the AC-link, allowing for full system performance

measurements. The function default value is 8000h, which is all off.

BIT

FUNCTION

WM9704M

SUPPORT

POP

PCM out path and mute, 0 = pre-3D, 1 = post-3D

Yes, but fixed at ‘1’

Simulated stereo enhancement, on/off 1 = on

3D stereo enhancement on/off, 1 = on

Yes

Loudness (bass boost) on/off, 1 = on

LLBK

Local loop back - for modem, line codec

RLBK

Remote loop back - for modem, line codec

MIX

Mono output select 0 = Mix, 1 = Mic

Yes

Mic select 0 = Mic1, 1 = Mic2

Yes

LPBK

ADC/DAC loopback mode

Yes

Table 15 General Purpose Register Function

WM9704CFT/V Datasheet(PDF) 26 Page - Wolfson Microelectronics plc

WM9704CFT/V Datasheet(HTML) 26 Page - Wolfson Microelectronics plc

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