WM9711 datasheet(28/66 Pages) WOLFSON

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WM9711L

Production Data

PD Rev 4.1 April 2004

ANALOGUE AUDIO OUTPUTS

The following sections give an overview of the analogue audio output pins. For more information on

recommended external components, please refer to the “Applications Information” section.

HEADPHONE OUTPUTS – HPOUTL AND HPOUTR

The HPOUTL and HPOUTR (pins 39 and 41) are designed to drive a 16

Ω or 32Ω headphone or a

line output. They can also be used as line-out pins. The output signal is produced by the headphone

mixer.

The signal volume on HPOUTL and HPOUTR can be independently adjusted under software control

by writing to register 04h. When HPOUTL and HPOUTR are not used, the output drivers can be

disabled to save power (see “Power Management” section). Both pins remain at the same DC level

(the reference voltage VREF) when they are disabled, so that no click noise is produced.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

MUTE

Mute HPOUTL and HPOUTR

1: Mute (OFF)

0: No Mute (ON)

13:8

HPOUTLVOL

000000

(0dB)

HPOUTL Volume

000000: 0dB (maximum)

000001: -1.5dB

… (1.5dB steps)

011111: -46.5dB

1xxxxx: -46.5dB

Zero Cross Enable

0: Change gain immediately

1: Change gain only on zero crossings,

or after time-out

04h

HPOUTL /

HPOUTR

Volume

5:0

HPOUTRVOL

00000

(0dB)

HPOUTR Volume

Similar to HPOUTLVOL

Table 15 HPOUTL / HPOUTR Control

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