WM9712CLGEFLSLASHV datasheet(74/78 Pages) WOLFSON

74 / 78 page

WM9712L

Production Data

PD, Rev 4.6, November 2011

BTL LOUDSPEAKER OUTPUT

LOUT2 and ROUT2 can differentially drive a mono 8

 loudspeaker as shown below.

LOUT2

ROUT2

WM9712L

INV = 1

Stereo: V

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

Mono: V

SPKR = M-(-M) = 2M

ROUT2VOL

LOUT2VOL

-1

Figure 27 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

WM9712L

OUT3

BTL ear

speaker

Figure 28 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

WM9712L

OUT3

ear speaker

(single-ended)

Figure 29 Combined Headset / Single-ended Ear Speaker (OUT3SRC = 01)

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