WM9705 datasheet(32/55 Pages) WOLFSON

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WM9705

Production Data

PD Rev 4.4 August 2006

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 11 Record Select Register Function

RECORD GAIN REGISTERS (INDEX 1Ch)

1Ch sets the stereo input record gain with each step corresponding to 1.5dB. The MSB of the

∞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 12 Record Gain Register Function

GENERAL PURPOSE REGISTER (INDEX 20h)

This register is used to control several miscellaneous functions of the WM9705.

Below is a summary of each bit and its function. Only the POP, 3D, MIX, MS and LPBK bits are

supported by the WM9705. 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 0000h which is all off.

BIT

FUNCTION

POP

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

3D stereo enhancement on/off, 1 = on

MIX

Mono output select 0 = Mix, 1 = Mic

Mic select 0 = Mic1, 1 = Mic2

LPBK

ADC/DAC loopback mode

3D CONTROL REGISTER (INDEX 22h)

This register is used to control the centre and/or depth of the 3D stereo enhancement function

built into the AC’97 component. Only the depth bits DP0 to 3 have effect in the WM9705.

DP3…DP0

DEPTH

Typical value

100%

Table 13 3D Control Register

POWERDOWN CONTROL/STATUS REGISTER (INDEX 26h)

This read/write register is used to program power-down states and monitor subsystem readiness.

The lower half of this register is read only status, a 1 indicating that the subsection is ready.

Ready is defined as the subsection able to perform in its nominal state. When this register is

written the bit values that come in on AC-link will have no effect on read bits 0- 7.

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