User guide

56 DS679F1
CS42L51
6.7 ADCx Input Select, Invert & Mute (Address 07h)
ADCX Input Select Bits (AINX_MUX[1:0])
Default: 00
Function:
Selects the specified analog input signal into ADCx. The microphone pre-amplifier is only available when
PDN_PGAx is disabled. See Figure 26.
ADCX Invert Signal Polarity (INV_ADCX)
Default: 0
0 - Disabled
1 - Enabled
Function:
When enabled, this bit will invert the signal polarity of the ADC x channel.
ADCX Channel Mute (ADCX_MUTE)
Default: 0
0 - Disabled
1 - Enabled
Function:
The output of channel x ADC will mute when enabled. The muting function is affected by the ADCx Soft bit
(SOFT).
76543210
AINB_MUX1 AINB_MUX0 AINA_MUX1 AINA_MUX0 INV_ADCB INV_ADCA ADCB_MUTE ADCA_MUTE
PDN_PGAx AINx_MUX[1:0] Selected Path to ADC
0 00 AIN1x-->PGAx
0 01 AIN2x-->PGAx
0 10 AIN3x/MICINx-->PGAx
0 11 AIN3x/MICINx-->Pre-Amp
(+16/+32 dB Gain)-->PGAx
100AIN1x
101AIN2x
1 10 AIN3x/MICINx
1 11 Reserved
MUX
AIN1x
AIN2x
AIN3x / MICINx
PGA
+16/
32 dB
MUX
AINx_MUX[1:0]
PDN_PGAx
AIN1x
AIN2x
AIN3x
Decoder
ADC
Figure 26. AIN & PGA Selection