WM9711 Datasheet, PDF (30/66 Pages) Wolfson Microelectronics plc – LOW POWER AUDIO CODEC FOR PORTABLE APPLICATIONS

WM9711L
LOUDSPEAKER OUTPUTS – LOUT2 AND ROUT2
Production Data
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
BIT
LABEL
ADDRESS
02h
15 MUTE
LOUT2/ROUT2
Volume
13:8 LOUT2VOL
7
ZC
6
INV
5:0 ROUT2VOL
16h
8
SRC
Table 17 LOUT2 / ROUT2 Control
DEFAULT
1
00000
(0dB)
0
0
00000
(0dB)
0
DESCRIPTION
Mute LOUT2 and ROUT2
1: Mute (OFF)
0: No Mute (ON)
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
LOUT2 Invert
0 = No Inversion (0° phase shift)
1 = Signal inverted (180° phase shift)
ROUT2 Volume
Similar to LOUT2VOL
Source of LOUT2/ROUT2 signals
0: speaker mixer (for BTL speaker)
1: headphone mixer (for stereo output)
Note:
1. For BTL speaker drive, it is recommended that LOUT2VOL = ROUT2VOL.
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PD Rev 4.1 April 2004
30