Datasheet
TSC2101
SLAS392D− JUNE 2003 − REVISED MAY 2005
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65
REGISTER 1EH: Gain Control for Handset Input
BIT NAME RESET VALUE READ/WRITE FUNCTION
D15 ADMUT_HND 1 R/W Handset Input Mute
1 => Handset Input Mute
0 => Handset Input not muted
Note: If AGC is enabled and handset Input is selected then
ADMUT_HND+ADPGA_HND will reflect gain being applied by AGC.
D14−D8 ADPGA_HND 1111111 R/W ADC Handset PGA Settings
0000000 => 0 dB
0000001 => 0.5 dB
0000010 => 1.0 dB
....
1110110 => 59.0 dB
.............
1111111 => 59.5 dB
Note: If AGC is enabled and handset Input is selected then
ADMUT_HND+ADPGA_HND will reflect 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
……….
11101000 => −12 dB
D7−D5 AGCTG_HND 000 R/W AGC Target Gain for Handset Input.
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
D4−D1 AGCTC_HND 0000 R/W AGC Time Constant for Handset Input.
These four bits set the AGC attack and decay time constants. Time
constants remain the same irrespective of any sampling frequency.
Attack time Decay time
(ms) (ms)
0000 8 100
0001 11 100
0010 16 100
0011 20 100
0100 8 200
0101 11 200
0110 16 200
0111 20 200
1000 8 400
1001 11 400
1010 16 400
1011 20 400
1100 8 500
1101 11 500
1110 16 500
1111 20 500
D0 AGCEN_HND 0 R/W AGC Enable for Handset Input
0 => AGC is off for Handset Input
(ADC PGA is controlled by ADMUT_HND+ADPGA_HND)
1 => AGC is on for Handset Input
(ADC PGA is controlled by AGC)