wm9712l Wolfson Microelectronics plc, wm9712l Datasheet - Page 31

• Manufacturer Part Number: wm9712l
• Description: Ac?97 Audio And Touchpanel Codec
• Manufacturer: Wolfson Microelectronics plc

Production Data
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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].
Table 17 LOUT2 / ROUT2 Control
Note:
1.
02h
LOUT2/ROUT2
Volume
16h
REGISTER
ADDRESS
For BTL speaker drive, it is recommended that LOUT2VOL = ROUT2VOL.
15
13:8
7
6
5:0
8
BIT
MUTE
LOUT2VOL
ZC
INV
ROUT2VOL
SRC
LABEL
1
00000
(0dB)
0
0
00000
(0dB)
0
DEFAULT
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)
DESCRIPTION
PD Rev 4.5 August 2006
WM9712L
31