Datasheet


SLAS412− DECEMBER 2003
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41
REGISTER 01H: CODEC ADC Gain Control
BIT NAME
READ/
WRITE
RESET
VALUE
FUNCTION
D15 ADMUT R/W 1 ADC Channel Mute
1 => ADC channel muted
0 => ADC channel not muted
Note: If AGC is enabled, then D15−D8 reflects gain being applied by AGC.
If AGC is on, the decoding for read values is as follows:
01110111 => +59.5 dB
01110110 => +59.0 dB
−−−−−
00000000 => 0 dB
−−−−−
11101001 => −11.5 dB
11101000 => −12 dB
D14−D8 ADPGA R/W 0000000 ADC PGA Settings
0000000 => ADC PGA = 0 dB
0000001 => ADC PGA = 0.5 dB
0000010 => ADC PGA = 1.0 dB
−−−−−
1110110 => ADC PGA = 59.0 dB
1110111 => ADC PGA = 59.5 dB
1111000 => ADC PGA = 59.5 dB
−−−−−
1111110 => ADC PGA = 59.5 dB
1111111 => ADC PGA = 59.5 dB
Note: If AGC is enabled, then D15−D8 reflects gain being applied by AGC. If AGC is
on, the decoding for read values is as follows
01110111 => +59.5 dB
01110110 => +59.0 dB
−−−−−
00000000 => 0 dB
−−−−−
11101001 => −11.5 dB
11101000 => −12 dB
D7−D5 AGCTG R/W 000 AGC Target Level. These three bits set the AGC’s targeted ADC output level.
000 => −5.5 dB
001 => −8.0 dB
010 => −10 dB
011 => −12 dB
100 => −14 dB
101 => −17 dB
110 => −20 dB
111 => −24 dB