Production Data
WM8750JL
LOUT2/ROUT2 OUTPUTS
The LOUT2 and ROUT2 output pins are essentially similar to LOUT1 and ROUT1, but they are
independently controlled and can also drive an 8 mono speaker (see Speaker Output section). For
speaker drive, the ROUT2 signal must be inverted (ROUT2INV = 1), so that the left and right channel
are mixed to mono in the speaker [L–(-R) = L+R].
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R40 (28h)
LOUT2
6:0
LOUT2VOL
[6:0]
1111001
(0dB)
LOUT2 Volume
1111111 = +6dB
Volume
… (80 steps)
0110000 = -67dB
0101111 to 0000000 = Analogue MUTE
Left zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
Left Volume Update
7
8
LO2ZC
LO2VU
0
0
0 = Store LOUT2VOL in intermediate
latch (no gain change)
1 = Update left and right channel gains
(left = LOUT2VOL, right = intermediate
latch)
R41 (29h)
ROUT2
6:0
ROUT2VOL
[6:0]
1111001
(0dB)
ROUT2 Volume
1111111 = +6dB
Volume
… (80 steps)
0110000 = -67dB
0101111 to 0000000 = Analogue MUTE
Right zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
Right Volume Update
7
8
RO2ZC
RO2VU
0
0
0 = Store ROUT1VOL in intermediate
latch (no gain change)
1 = Update left and right channel gains
(left = ROUT1VOL, right = intermediate
latch)
R24 (18h)
4
ROUT2INV
0
ROUT2 Invert
Additional
Control (2)
0 = No Inversion (0 phase shift)
1 = Signal inverted (180 phase shift)
Table 26 LOUT2/ROUT2 Volume Control
MONO OUTPUT
The MONOOUT pin can drive a mono line output. The signal volume on MONOOUT can be adjusted
under software control by writing to MONOOUTVOL.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R42 (2Ah)
MONOOUT
Volume
6:0
MONOOUT
VOL [6:0]
1111001
(0dB)
MONOOUT Volume
1111111 = +6dB
… (80 steps)
0110000 = -67dB
0101111 to 0000000 = Analogue MUTE
MONOOUT zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
7
MOZC
0
Table 27 MONOOUT Volume Control
PD, April 2012, Rev 4.1
33
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
