Datasheet
TLV320AIC31
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............................................................................................................................................. SLAS497C – AUGUST 2006 – REVISED DECEMBER 2008
Page 0 / Register 28: Left AGC Control Register C
BIT READ/ RESET DESCRIPTION
WRITE VALUE
D7 – D6 R/W 00 Noise Gate Hysteresis Level Control
00: Hysteresis is disabled
01: Hysteresis = 1-dB
10: Hysteresis = 2-dB
11: Hysteresis = 4-dB
D5 – D1 R/W 00000 Left AGC Noise Threshold Control
00000: Left AGC Noise/Silence Detection disabled
00001: Left AGC noise threshold = – 30-dB
00010: Left AGC noise threshold = – 32-dB
00011: Left AGC noise threshold = – 34-dB
…
11101: Left AGC noise threshold = – 86-dB
11110: Left AGC noise threshold = – 88-dB
11111: Left AGC noise threshold = – 90-dB
D0 R/W 0 Left AGC Clip Stepping Control
0: Left AGC clip stepping disabled
1: Left AGC clip stepping enabled
Page 0 / Register 29: Right AGC Control Register A
BIT READ/ RESET DESCRIPTION
WRITE VALUE
D7 R/W 0 Right AGC Enable
0: Right AGC is disabled
1: Right AGC is enabled
D6-D4 R/W 000 Right AGC Target Gain
000: Right AGC target gain = – 5.5-dB
001: Right AGC target gain = – 8-dB
010: Right AGC target gain = – 10-dB
011: Right AGC target gain = – 12-dB
100: Right AGC target gain = – 14-dB
101: Right AGC target gain = – 17-dB
110: Right AGC target gain = – 20-dB
111: Right AGC target gain = – 24-dB
D3 – D2 R/W 00 Right AGC Attack Time
These time constants will not be accurate when double rate audio mode is enabled.
00: Right AGC attack time = 8-msec
01: Right AGC attack time = 11-msec
10: Right AGC attack time = 16-msec
11: Right AGC attack time = 20-msec
D1 – D0 R/W 00 Right AGC Decay Time
These time constants will not be accurate when double rate audio mode is enabled.
00: Right AGC decay time = 100-msec
01: Right AGC decay time = 200-msec
10: Right AGC decay time = 400-msec
11: Right AGC decay time = 500-msec
Page 0 / Register 30: Right AGC Control Register B
BIT READ/ RESET DESCRIPTION
WRITE VALUE
D7 – D1 R/W 1111111 Right AGC Maximum Gain Allowed
0000000: Maximum gain = 0.0-dB
0000001: Maximum gain = 0.5-dB
0000010: Maximum gain = 1.0-dB
…
1110110: Maximum gain = 59.0-dB
1110111 – 111111: Maximum gain = 59.5-dB
D0 R/W 0 Reserved. Write only '0' to this register bit.
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