WM9713LGEFLSLASHV datasheet(44/108 Pages) WOLFSON

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WM9713L

Pre-Production

PP Rev 3.0 June 2006

MONOIN INPUT

Pin 20 (MONOIN) is a mono input designed to connect to the receive path of a telephony device. The

pin connects directly to the record selector for phone call recording (Note: to record both sides of a

phone call, one ADC channel should record the MONOIN signal while the other channel records the

MIC signal). The record PGA adjusts the recording volume, and is controlled by register 12h or by

the ALC function (see “Record Gain” and “Automatic Level Control” sections).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

15:14

R2H

11 (mute)

Controls record mux to headphone mixer

paths.

00=stereo

01=left rec mux only

10=right rec mux only

11=mute left and right

13:11

R2HVOL

010 (0dB)

Controls gain of record mux l/r to headphone

mixer paths

000: +6dB

… (3dB steps)

111: -15dB

10:9

R2M

11 (mute)

Controls record mux to mono mixer path.

00=stereo

01=left rec mux only

10=right rec mux only

11=mute left and right

14h

Record

Routing

R2MBST

0 (OFF)

Enables 20dB gain boost for record mux to

mono mixer path

Table 28 Record PGA Routing Control

To listen to the MONOIN signal, the signal passes through a separate PGA, controlled by register

08h. The signal can be routed into the headphone mixer (for normal phone call operation) and/or the

speaker mixer (for speakerphone operation), but not into the mono mixer (to prevent forming a

feedback loop). When the signal is not selected as an input to any of the mixers the output of the

PGA is muted automatically.

When not in use the MONOIN PGA can be powered down using the Powerdown register bit MOIN

(register 3Eh, bit 4).

MONOIN is biased internally to the reference voltage VREF. Whenever the input is muted or the

device placed into standby mode, the input remains biased to VREF using special anti-thump

circuitry to suppress any audible clicks when changing inputs.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

M2H

Mute MONIN path to headphone mixer

1: Mute, 0: No mute (ON)

M2S

Mute MONOIN path to speaker mixer

1: Mute, 0: No mute (ON)

08h

MONOIN

PGA Vol /

Routing

12:8

MONOIN

VOL

01000

(0dB)

MONOIN input gain

00000: +12dB

… (1.5dB steps)

11111: -34.5dB

Table 29 Mono PGA Control

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