TLV320AIC34
SLAS538A – OCTOBER 2007 – REVISED NOVEMBER 2007
Page 0 / Register 28: Left-AGC Control Register C
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7 – D6 R/W 00 Noise Gate Hysteresis Level Control
00: Hysteresis = 1 dB
01: Hysteresis = 2 dB
10: Hysteresis = 3 dB
11: Hysteresis is disabled.
D5 – D1 R/W 00 000 Left-AGC Noise Threshold Control
00 000: Left-AGC noise/silence detection disabled
00 001: Left-AGC noise threshold = – 30 dB
00 010: Left-AGC noise threshold = – 32 dB
00 011: Left-AGC noise threshold = – 34 dB
…
11 101: Left-AGC noise threshold = – 86 dB
11 110: Left-AGC noise threshold = – 88 dB
11 111: 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
READ/ RESET
BIT 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 Level
000: Right-AGC target level = – 5.5 dB
001: Right-AGC target level = – 8 dB
010: Right-AGC target level = – 10 dB
011: Right-AGC target level = – 12 dB
100: Right-AGC target level = – 14 dB
101: Right-AGC target level = – 17 dB
110: Right-AGC target level = – 20 dB
111: Right-AGC target level = – 24 dB
D3 – D2 R/W 00 Right-AGC Attack Time
These time constants are not accurate when double-rate audio mode is enabled.
00: Right-AGC attack time = 8 ms
01: Right-AGC attack time = 11 ms
10: Right-AGC attack time = 16 ms
11: Right-AGC attack time = 20 ms
D1 – D0 R/W 00 Right-AGC Decay Time
These time constants are not accurate when double-rate audio mode is enabled.
00: Right-AGC decay time = 100 ms
01: Right-AGC decay time = 200 ms
10: Right-AGC decay time = 400 ms
11: Right-AGC decay time = 500 ms
Page 0 / Register 30: Right-AGC Control Register B
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7 – D1 R/W 1111 111 Right-AGC Maximum Gain Allowed
0000 000: Maximum gain = 0 dB
0000 001: Maximum gain = 0.5 dB
0000 010: Maximum gain = 1 dB
…
1110 110: Maximum gain = 59 dB
1110 111 – 1111 111: Maximum gain = 59.5 dB
D0 R/W 0 Reserved. Write only zero to this register bit.
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