WM8976_11 Datasheet, PDF (61/114 Pages) Wolfson Microelectronics plc – Stereo CODEC with Speaker Driver

Production Data
WM8976
Figure 32 Outputs OUT3 and OUT4
REGISTER BIT
LABEL
ADDRESS
R49
3
OUT3BOOST
Output control
DEFAULT
0
4
OUT4BOOST
0
R1
8
BUFDCOPEN
0
Power
management
1
Table 47 OUT3 and OUT4 Boost Stages Control
DESCRIPTION
0 = OUT3 output gain = -1;
DC = AVDD / 2
1 = OUT3 output gain = +1.5
DC = 1.5 x AVDD / 2
0 = OUT4 output gain = -1;
DC = AVDD / 2
1 = OUT4 output gain = +1.5
DC = 1.5 x AVDD / 2
Dedicated buffer for DC level shifting
output stages when in 1.5x gain
boost configuration.
0=Buffer disabled
1=Buffer enabled (required for 1.5x
gain boost)
OUT3BOOST/
OUT4BOOST
0
1
OUTPUT
STAGE GAIN
1x
1.5x
OUTPUT DC
LEVEL
AVDD/2
1.5xAVDD/2
Table 48 OUT3/OUT4 Output Boost Stage Details
OUTPUT STAGE
CONFIGURATION
Inverting
Non-inverting
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PD, Rev 4.5, November 2011
61