Datasheet

TLV320AIC3007
SLOS619 – APRIL 2009 ..................................................................................................................................................................................................... www.ti.com
Page 0 / Register 26: Left AGC Control Register A
BIT READ/ RESET DESCRIPTION
WRITE VALUE
D7 R/W 0 Left AGC Enable
0: Left AGC is disabled
1: Left AGC is enabled
D6 – D4 R/W 000 Left AGC Target Level
000: Left AGC target level = – 5.5 dB
001: Left AGC target level = – 8 dB
010: Left AGC target level = – 10 dB
011: Left AGC target level = – 12 dB
100: Left AGC target level = – 14 dB
101: Left AGC target level = – 17 dB
110: Left AGC target level = – 20 dB
111: Left AGC target level = – 24 dB
D3 – D2 R/W 00 Left AGC Attack Time
These time constants
(1)
will not be accurate when double rate audio mode is enabled.
00: Left AGC attack time = 8-msec
01: Left AGC attack time = 11-msec
10: Left AGC attack time = 16-msec
11: Left AGC attack time = 20-msec
D1 – D0 R/W 00 Left AGC Decay Time
These time constants
(1)
will not be accurate when double rate audio mode is enabled.
00: Left AGC decay time = 100-msec
01: Left AGC decay time = 200-msec
10: Left AGC decay time = 400-msec
11: Left AGC decay time = 500-msec
(1) Time constants are valid when DRA is not enabled. The values would change if DRA is enabled.
Page 0 / Register 27: Left AGC Control Register B
BIT READ/ RESET DESCRIPTION
WRITE VALUE
D7-D1 R/W 1111111 Left 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 zero to this register bit.
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 = 1 dB
01: Hysteresis = 2 dB
10: Hysteresis = 4 dB
11: Hysteresis is disabled
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
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