WM9715L
Production Data
LOUDSPEAKER OUTPUTS – LOUT2 AND ROUT2
The LOUT2 and ROUT2 outputs are designed to differentially drive an 8Ω 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].
REGISTER
ADDRESS
BIT
LABEL
MUTE
DEFAULT
DESCRIPTION
02h
15
1
Mute LOUT2 and ROUT2
1: Mute (OFF)
LOUT2/ROUT2
Volume
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
7
6
ZC
0
0
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)
ROUT2 Volume
5:0
8
ROUT2VOL
SRC
00000
(0dB)
0
Similar to LOUT2VOL
16h
Source of LOUT2/ROUT2 signals
0: speaker mixer (for BTL speaker)
1: headphone mixer (for stereo output)
Table 17 LOUT2 / ROUT2 Control
Note:
1. For BTL speaker drive, it is recommended that LOUT2VOL = ROUT2VOL.
PD Rev 4.0 December 2007
32
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
