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WM8980 Datasheet(PDF) 49 Page - Wolfson Microelectronics plc

Part # WM8980
Description  STEREO CODEC WITH SPEAKER DRIVER AND BUFFER
PDF  81 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8980 Datasheet(HTML) 49 Page - Wolfson Microelectronics plc

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WM8980
w
PP Rev 1.6 January 2005
49
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
6
OUT3MUTE
0
0 = Output stage outputs OUT3 mixer
1 = Output stage muted – drives out
VMID. Can be used as VMID buffer in
this mode.
3
OUT4_2OUT3
0
OUT4 mixer output to OUT3
0 = disabled
1= enabled
2
BYPL2OUT3
0
Left ADC input to OUT3
0 = disabled
1= enabled
1
LMIX2OUT3
0
Left DAC mixer to OUT3
0 = disabled
1= enabled
R56
OUT3 mixer
control
0
LDAC2OUT3
1
Left DAC output to OUT3
0 = disabled
1= enabled
6
OUT4MUTE
0
0 = Output stage outputs OUT4 mixer
1 = Output stage muted – drives out
VMID. Can be used as VMID buffer in
this mode.
5
HALFSIG
0
0=OUT4 normal output
1=OUT4 attenuated by 6dB
4
LMIX2OUT4
0
Left DAC mixer to OUT4
0 = disabled
1= enabled
3
LDAC2OUT4
0
Left DAC to OUT4
0 = disabled
1= enabled
2
BYPR2OUT4
0
Right ADC input to OUT4
0 = disabled
1= enabled
1
RMIX2OUT4
0
Right DAC mixer to OUT4
0 = disabled
1= enabled
R57
OUT4 mixer
control
0
RDAC2OUT4
1
Right DAC output to OUT4
0 = disabled
1= enabled
Table 37 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 20, 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 34 summarises the effect of the OUT3BOOST
and OUT4BOOST control bits.



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