WM9711 datasheet(62/66 Pages) WOLFSON

62 / 66 page

WM9711L

Production Data

PD Rev 4.1 April 2004

BTL SPEAKER OUTPUT

LOUT2 and ROUT2 can differentially drive a mono 8

Ω speaker as shown below.

LOUT2

ROUT2

WM9711L

INV = 1

Stereo: V

SPKR = L-(-R) = L+R

Mono: V

SPKR = M-(-M) = 2M

ROUT2VOL

LOUT2VOL

-1

Figure 19 Speaker Output Connection (INV = 1)

The right channel is inverted by setting the INV bit, so that the signal across the loudspeaker is the

sum of left and right channels.

COMBINED HEADSET / BTL EAR SPEAKER

In smartphone applications with a loudspeaker and separate ear speaker (receiver), a BTL ear

speaker can be connected at the OUT3 pin, as shown below.

HPOUTL

HPOUTR

HPGND = 0V

WM9711L

OUT3

BTL ear

speaker

Figure 20 Combined Headset / BTL Ear Speaker (OUT3SRC = 00)

The ear speaker and the headset play the same signal. Whenever the headset is plugged in, the

headphone outputs are enabled and OUT3 disabled. When the headset is not plugged in, OUT3 is

enabled (see “Jack Insertion and Auto-Switching”).

COMBINED HEADSET / SINGLE-ENDED EAR SPEAKER

Instead of a BTL ear speaker, a single-ended ear speaker can also be used, as shown below.

HPOUTL

HPOUTR

HPGND = 0V

WM9711L

OUT3

ear speaker

(single-ended)

Figure 21 Combined Headset / Single-ended Ear Speaker (OUT3SRC = 01)

WM9711 Datasheet(PDF) 62 Page - Wolfson Microelectronics plc

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