WM8983_06 Datasheet, PDF (74/123 Pages) Wolfson Microelectronics plc – Mobile Multimedia CODEC with 1W Speaker Driver

WM8983
Production Data
REGISTER
ADDRESS
R56
OUT3 mixer
control
BIT
LABEL
6
OUT3MUTE
3
OUT4_2OUT3
2
BYPL2OUT3
1
LMIX2OUT3
0
LDAC2OUT3
R57
7
OUT4 mixer
control
6
OUT3_2OUT4
OUT4MUTE
5
OUT4ATTN
4
LMIX2OUT4
3
LDAC2OUT4
2
BYPR2OUT4
1
RMIX2OUT4
0
RDAC2OUT4
Table 47 OUT3/OUT4 Mixer Registers
DEFAULT
0
0
0
0
1
0
0
0
0
0
0
0
1
DESCRIPTION
0 = Output stage outputs OUT3 mixer
1 = Output stage muted – drives out
VMID. Can be used as VMID reference
in this mode.
OUT4 mixer output to OUT3
0 = disabled
1 = enabled
Left 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
OUT3 mixer output to OUT4
0 = disabled
1= enabled
0 = Output stage outputs OUT4 mixer
1 = Output stage muted – drives out
VMID. Can be used as VMID reference
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 ADC input to OUT4
0 = disabled
1 = enabled
Right DAC mixer to OUT4
0 = disabled
1 = enabled
Right DAC output to OUT4
0 = disabled
1 = enabled
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 AVDD1/2 to 1.5xAVDD1/2) to prevent
the signal from clipping. A dedicated amplifier BUFDCOP, as shown in Figure 39, 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 AVDD2 is not equal to or greater than 1.5xAVDD1
this boost mode may result in signals clipping. Table 44 summarises the effect of the OUT3BOOST
and OUT4BOOST control bits.
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PD Rev 4.0 November 2006
74