Datasheet

TLV320AIC3120
www.ti.com SLAS653A –FEBRUARY 2010–REVISED MAY 2012
Page 0 / Register 86 (0x56): AGC Control 1
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7 R/W 0 0: AGC disabled
1: AGC enabled
D6–D4 R/W 000 000: AGC target level = –5.5 dB
001: AGC target level = –8 dB
010: AGC target level = –10 dB
011: AGC target level = –12 dB
100: AGC target level = –14 dB
101: AGC target level = –17 dB
110: AGC target level = –20 dB
111: AGC target level = –24 dB
D3–D0 R/W 0000 Reserved. Write only zeros to these bits.
Page 0 / Register 87 (0x57): AGC Control 2
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7–D6 R/W 00 00: AGC hysteresis setting of 1 dB
01: AGC hysteresis setting of 2 dB
10: AGC hysteresis setting of 4 dB
11: AGC hysteresis disabled
D5–D1 R/W 00 000 00 000: AGC noise/silence detection is disabled.
00 001: AGC noise threshold = –30 dB
00 010: AGC noise threshold = –32 dB
00 011: AGC noise threshold = –34 dB
...
11 101: AGC noise threshold = –86 dB
11 110: AGC noise threshold = –88 dB
11 111: AGC noise threshold = –90 dB
D0 R/W 0 Reserved. Write only zero to this bit.
Page 0 / Register 88 (0x58): AGC Maximum Gain
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7 R/W 0 Reserved. Write only zero to this bit.
D6–D0 R/W 111 1111 000 0000: AGC maximum gain = 0 dB
000 0001: AGC maximum gain = 0.5 dB
000 0010: AGC maximum gain = 1 dB
...
111 0011: AGC maximum gain = 57.5 dB
111 0100: AGC maximum gain = 58 dB
111 0101: AGC maximum gain = 58.5 dB
111 0110: AGC maximum gain = 59 dB
111 0111: AGC maximum gain = 59.5 dB
111 1000–111 1111: Reserved. Do not write these sequences to these bits.
Page 0 / Register 89 (0x59): AGC Attack Time
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7–D3 R/W 0000 0 0000 0: AGC attack time = 1 × (32/f
S
), where f
S
is the ADC sample rate
0000 1: AGC attack time = 3 × (32/f
S
), where f
S
is the ADC sample rate
0001 0: AGC attack time = 5 × (32/f
S
), where f
S
is the ADC sample rate
0001 1: AGC attack time = 7 × (32/f
S
), where f
S
is the ADC sample rate
0010 0: AGC attack time = 9 × (32/f
S
), where f
S
is the ADC sample rate
...
1111 0: AGC attack time = 61 × (32/f
S
), where f
S
is the ADC sample rate
1111 1: AGC attack time = 63 × (32/f
S
), where f
S
is the ADC sample rate
D2–D0 R/W 000 000: Multiply factor for the programmed AGC attack time = 1
001: Multiply factor for the programmed AGC attack time = 2
010: Multiply factor for the programmed AGC attack time = 4
...
111: Multiply factor for the programmed AGC attack time = 128
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