WM8973 Wolfson Microelectronics Ltd., WM8973 Datasheet - Page 35

• Manufacturer Part Number: WM8973
• Description: The WM8976 is a low power, high quality stereo codec designed for portable applications such as Digital still camera or Digital Camcorde
• Manufacturer: Wolfson Microelectronics Ltd.

Production Data
w
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
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].
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.
Table 27 MONOOUT Volume Control
OUT3 OUTPUT
The OUT3 pin can drive a 16
headphone output (see Headphone Output section). It can be selected to either drive out an inverted
ROUT1 or inverted MONOOUT for e.g. an earpiece drive between OUT3 and LOUT1 or differential
output between OUT3 and MONOOUT. OUT3 can also drive an un-inverted ROUT1 signal, which
originates at the right mixer output before the output PGA.
OUT3SW selects the mode of operation required.
Table 28 OUT3 Select
R40 (28h)
LOUT2
Volume
R41 (29h)
ROUT2
Volume
R24 (18h)
Additional
Control (2)
R42 (2Ah)
MONOOUT
Volume
R24 (18h)
Additional
Control (2)
REGISTER
REGISTER
REGISTER
ADDRESS
ADDRESS
ADDRESS
6:0
7
8
6:0
7
8
4
6:0
7
8:7
BIT
BIT
BIT
LOUT2VOL
[6:0]
LO2ZC
LO2VU
ROUT2VOL
[6:0]
RO2ZC
RO2VU
ROUT2INV
MONOOUT
VOL [6:0]
MOZC
OUT3SW
[1:0]
LABEL
LABEL
LABEL
or 32
headphone or a line output or be used as a DC reference for a
1111001
(0dB)
0
0
1111001
(0dB)
0
0
0
1111001
(0dB)
0
00
DEFAULT
DEFAULT
DEFAULT
mono speaker (see Speaker Output section). For
Similar to LOUT1VOL
Left zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
Same as LO1VU
Similar ROUT1VOL
Right zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
Same as RO1VU
ROUT2 Invert
0 = No Inversion (0 phase shift)
1 = Signal inverted (180 phase shift)
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
OUT3 select
00 : VREF
01 : ROUT1 signal (volume controlled by
10 : MONOOUT
11 : right mixer output (no volume
ROUT1VOL)
control through ROUT1VOL)
PD Rev 4.2 September 2005
DESCRIPTION
DESCRIPTION
DESCRIPTION
WM8973L
35