WM9713 datasheet(30/111 Pages) WOLFSON

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WM9713L

Preliminary Technical Data

PTD, March 2004, Rev 2.2

RECORD GAIN

The amplitude of the signal that enters the audio ADC is controlled by the Record PGA

(Programmable Gain Amplifier). The PGA gain can be programmed either by writing to the Record

Gain register, or by the Automatic Level Control (ALC) circuit (see next section). When the ALC is

enabled, any writes to the Record Gain register have no effect.

Two different gain ranges can be implemented: the standard gain range defined in the AC’97

standard, or an extended gain range with smaller gain steps. The ALC circuit always uses the

extended gain range, as this has been found to result in better sound quality.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

RMU

Mute Audio ADC (both channels)

1: Mute (OFF)

0: No Mute (ON)

GRL

Gain range select (left)

0: Standard (0 to 22.5dB, 1.5dB step size)

1: Extended (-17.25 to +30dB, 0.75dB steps)

Record Volume (left)

Standard (GRL=0)

Extended (GRL=1)

13:8

RECVOLL

000000

XX0000: 0dB

XX0001: +1.5dB

… (1.5dB steps)

XX1111: +22.5dB

000000: -17.25dB

000001: -16.5dB

… (0.75dB steps)

111111: +30dB

Zero Cross Enable

0: Record Gain changes immediately

1: Record Gain changes when signal is zero

or after time-out

GRR

Gain range select (right)

Similar to GRL

12h

Record Gain

5:0

RECVOLR

000000

Record Volume (right)

Similar to RECVOLR

Table 11 Record Gain Register

The output of the Record PGA can also be mixed into the phone and/or headphone outputs (see

“Audio Mixers”). This makes it possible to use the ALC function for the microphone signal in a

smartphone application.

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

001: +3dB

... (3dBsteps)

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 12 Record PGA Routing Control

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