TSC2101_07 Datasheet, PDF (65/93 Pages) Texas Instruments – AUDIO CODEC WITH INTEGRATED HEADPHONE, SPEAKER AMPLIFIER AND TOUCH SCREEN CONTROLLER

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REGISTER 1EH: Gain Control for Handset Input
BIT
NAME
RESET VALUE READ/WRITE
D15 ADMUT_HND
1
R/W
D14−D8 ADPGA_HND
1111111
R/W
D7−D5 AGCTG_HND
000
R/W
D4−D1 AGCTC_HND
0000
R/W
D0
AGCEN_HND
0
R/W
TSC2101
SLAS392D− JUNE 2003 − REVISED MAY 2005
FUNCTION
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.
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
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
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
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)
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