WM9713LGEFLSLASHV datasheet(39/108 Pages) WOLFSON

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Pre-Production

WM9713L

PP Rev 3.0 June 2006

AUDIO INPUTS

The following sections give an overview of the analogue audio input pins and their function. For more

information on recommended external components, please refer to the “Applications Information”

section.

LINE INPUT

The LINEL and LINER inputs are designed to record line level signals, and/or to mix into one of the

analogue outputs.

Both pins are directly connected to the record selector. The record PGA adjusts the recording

volume, controlled by register 12h or by the ALC function.

For analogue mixing, the line input signals pass through a separate PGA, controlled by register 0Ah.

The signals can be mixed into the headphone, speaker and mono mixer paths (see “Audio Mixers”).

Each LINE-to-mixer path has an independent mute bit. When all LINE-to-mixer paths are muted the

line PGA is muted automatically. When the line inputs are not used, the line PGA can be switched off

to save power (see “Power Management” section).

LINEL and LINER are biased internally to the reference voltage VREF. Whenever the inputs are

muted or the device placed into standby mode, the inputs remain biased to VREF using special anti-

thump circuitry to suppress any audible clicks when changing inputs.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

L2H

Mute LINE path to headphone mixer

1: Mute, 0: No mute (ON)

L2S

Mute LINE path to speaker mixer

1: Mute, 0: No mute (ON)

L2M

Mute LINE path to mono mixer

1: Mute, 0: No mute (ON)

12:8

LINEL

VOL

01000

(0dB)

LINEL input gain

00000: +12dB

… (1.5dB steps)

11111: -34.5dB

0Ah

4:0

LINER

VOL

01000

(0dB)

LINER input gain

similar to LINELVOL

Table 22 Line Input Control

Additionally, line inputs can be used as single-ended microphone inputs through the record mux to

provide a clickless ALC function by bypassing offset introduced through the microphone pre-amps.

Note that the line inputs to the mixers should all be deselected if this is input configuration is used.

MICROPHONE INPUT

MICROPHONE PRE-AMPS

There are two microphone pre-amplifiers, MPA and MPB, which can be configured in a variety of

ways to accommodate up to 3 selectable differential microphone inputs or 2 differential microphone

inputs operating simultaneously for stereo or noise cancellation. The microphone input circuit is

shown in Figure 12.

WM9713LGEFL/V Datasheet(PDF) 39 Page - Wolfson Microelectronics plc

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