WM8976GEFL/V Wolfson Microelectronics, WM8976GEFL/V Datasheet - Page 60

Audio CODECs Mono ADC Stereo DAC with Spkr

WM8976GEFL/V

Manufacturer Part Number
WM8976GEFL/V
Description
Audio CODECs Mono ADC Stereo DAC with Spkr
Manufacturer
Wolfson Microelectronics
Datasheet

Specifications of WM8976GEFL/V

Mounting Style
SMD/SMT
Package / Case
QFN-32
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
WM8976
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Table 46 OUT3/OUT4 Mixer Registers
The OUT3 and OUT4 output stages each have a selectable gain boost of 1.5x (3.52dB). When this
boost is enabled the output DC level is also level shifted (from AVDD/2 to 1.5xAVDD/2) to prevent
the signal from clipping. A dedicated amplifier BUFDCOP, as shown in Figure 32, is used to perform
the DC level shift operation. This buffer must be enabled using the BUFDCOPEN register bit for this
operating mode. It should also be noted that if SPKVDD is not equal to or greater than 1.5xAVDD this
boost mode may result in signals clipping. Table 43 summarises the effect of the OUT3BOOST and
OUT4BOOST control bits.
R56
OUT3 mixer
control
R57
OUT4 mixer
control
REGISTER
ADDRESS
6
3
2
1
0
6
5
4
3
1
0
BIT
RDAC2OUT4
OUT3MUTE
OUT4_2OUT3
BYPL2OUT3
LMIX2OUT3
LDAC2OUT3
OUT4MUTE
HALFSIG
LMIX2OUT4
LDAC2OUT4
RMIX2OUT4
LABEL
0
0
0
0
1
0
0
0
0
0
1
DEFAULT
0 = Output stage outputs OUT3 mixer
1 = Output stage muted – drives out
VMID. Can be used as VMID buffer in
this mode.
OUT4 mixer output to OUT3
0 = disabled
1= enabled
ADC input to OUT3
0 = disabled
1= enabled
Left DAC mixer to OUT3
0 = disabled
1= enabled
Left DAC output to OUT3
0 = disabled
1= enabled
0 = Output stage outputs OUT4 mixer
1 = Output stage muted – drives out
VMID. Can be used as VMID buffer in
this mode.
0=OUT4 normal output
1=OUT4 attenuated by 6dB
Left DAC mixer to OUT4
0 = disabled
1= enabled
Left DAC to OUT4
0 = disabled
1= enabled
Right DAC mixer to OUT4
0 = disabled
1= enabled
Right DAC output to OUT4
0 = disabled
1= enabled
DESCRIPTION
PD Rev 4.4 July 2009
Production Data
60

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