WM9711 datasheet(30/66 Pages) WOLFSON

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WM9711L

Production Data

PD Rev 4.1 April 2004

LOUDSPEAKER OUTPUTS – LOUT2 AND ROUT2

The LOUT2 and ROUT2 outputs are designed to differentially drive an 8

Ω mono speaker. They can

also be used as a stereo line-out or headphone output.

For speaker drive, the LOUT2 signal must be inverted (INV = 1), so that the left and right channel are

added up in the speaker [R–(-L) = R+L].

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

MUTE

Mute LOUT2 and ROUT2

1: Mute (OFF)

0: No Mute (ON)

13:8

LOUT2VOL

00000

(0dB)

LOUT2 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

INV

LOUT2 Invert

0 = No Inversion (0

° phase shift)

1 = Signal inverted (180

° phase shift)

02h

LOUT2/ROUT2

Volume

5:0

ROUT2VOL

00000

(0dB)

ROUT2 Volume

Similar to LOUT2VOL

16h

SRC

Source of LOUT2/ROUT2 signals

0: speaker mixer (for BTL speaker)

1: headphone mixer (for stereo output)

Table 17 LOUT2 / ROUT2 Control

Note:

For BTL speaker drive, it is recommended that LOUT2VOL = ROUT2VOL.

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