WM9711 datasheet(29/66 Pages) WOLFSON

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Production Data

WM9711L

PD Rev 4.1 April 2004

EAR SPEAKER OUTPUT – OUT3

Pin 37 (OUT3) has a buffer that can drive load impedances down to 16

Ω. It can be used to:

•

Drive an ear speaker (phone receiver). The speaker can be connected differentially

between OUT3 and HPOUTL, or in single-ended configuration (OUT3 to HPGND). The

ear speaker output is produced by the headphone mixer. The right signal must be

inverted (OUT3INV = 1), so that the left and right channel are mixed to mono in the

speaker [L–(-R) = L+R].

•

Eliminate the DC blocking capacitors on HPOUTL and HPOUTR. In this configuration,

OUT3 produces a buffered midrail voltage (AVDD/2) and is connected to the headphone

socket’s ground pin (see “Applications Information”)

•

Produce the inverse of the MONOOUT signal, for a differential mono output.

Note: OUT3 can only handle one of the above functions at any given time.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

MUTE

Mute OUT3

1: Mute (Buffer OFF)

0: No Mute (Buffer ON)

Source of OUT3 signal

inverse of HPOUTR

(for BTL ear speaker)

VREF (for capless headphone drive)

mono mix of both headphone

channels (for single-ended ear

speaker)

10:9

OUT3

SRC

inverse of MONOOUT

(for differential mono output)

Zero Cross Enable

0: Change gain immediately

1: Change gain only on zero crossings, or

after time-out

16h

OUT3

Control

5:0

OUT3

VOL

000000

(0dB)

OUT3 Volume

000000: 0dB (maximum)

000001: -1.5dB

… (1.5dB steps)

011111: -46.5dB

1xxxxx: -46.5dB

Table 16 OUT3 Control

WM9711 Datasheet(PDF) 29 Page - Wolfson Microelectronics plc

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