Datasheet

TSC2101
SLAS392D JUNE 2003 REVISED MAY 2005
www.ti.com
57
REGISTER 01H: Gain Control for Headset/Aux Input
BIT NAME
RESET
VALUE
READ/
WRITE
FUNCTION
D15 ADMUT_HED 1 R/W Headset/Aux Input Mute
1 => Headset/Aux Input Mute
0 => Headset/Aux Input not muted
Note: If AGC is enabled and Headset/Aux Input is selected then ADMUT_HED+ADPGA_HED
reflects gain being applied by AGC.
D14D8 ADPGA_HED 1111111 R/W ADC Headset/Aux 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 Headset/Aux Input is selected then ADMUT_HED+ADPGA_HED
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
D7D5 AGCTG_HED 000 R/W AGC Target Gain for Headset/Aux 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
D4D1 AGCTC_HED 0000 R/W AGC Time Constant for Headset/Aux Input. These four bits set the AGC attack and decay time
constants. Time constants remain 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_HED 0 R/W AGC Enable for Headset/Aux Input
0 => AGC is off for Headset/Aux Input
(ADC Headset/Aux PGA is controlled by ADMUT_HED+ADPGA_HED)
1 => AGC is on for Headset/Aux Input
(ADC Headset/Aux PGA is controlled by AGC)