Datasheet

TLV320AIC3120
www.ti.com SLAS653A –FEBRUARY 2010–REVISED MAY 2012
Page 1 / Register 46 (0x2E): MICBIAS
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7 R/W 0 0: Device software power down is not enabled.
1: Device software power down is enabled.
D6–D4 R/W 000 Reserved. Write only zeros to these bits.
D3 R/W 0 0: Programmed MICBIAS is not powered up if headset detection is enabled but headset is not inserted.
1: Programmed MICBIAS is powered up even if headset is not inserted.
D2 R/W 0 Reserved. Write only zero to this bit.
D1–D0 R/W 00 00: MICBIAS output is powered down.
01: MICBIAS output is powered to 2 V.
10: MICBIAS output is powered to 2.5 V.
11: MICBIAS output is powered to AVDD.
Page 1 / Register 47 (0x2F): MIC PGA
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7 R/W 1 0: MIC PGA is controlled by bits D6–D0.
1: MIC PGA is at 0 dB.
D6–D0 R/W 000 0000 000 0000: PGA = 0 dB
000 0001: PGA = 0.5 dB
000 0010: PGA = 1 dB
...
111 0110: PGA = 59 dB
111 0111: PGA = 59.5 dB
111 1000–111 1111: Reserved. Do not write these sequences to these bits.
Page 1 / Register 48 (0x30): Delta-Sigma Mono ADC Channel Fine-Gain Input Selection for P-
Terminal
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7–D6 R/W 00 00: MIC1LP is not selected for the MIC PGA.
(1)
01: MIC1LP is selected for the MIC PGA with feed-forward resistance RIN = 10 kΩ.
10: MIC1LP is selected for the MIC PGA with feed-forward resistance RIN = 20 kΩ.
11: MIC1LP is selected for the MIC PGA with feed-forward resistance RIN = 40 kΩ.
D5–D4 R/W 00 00: MIC1RP is not selected for the MIC PGA.
01: MIC1RP is selected for the MIC PGA with feed-forward resistance RIN = 10 kΩ.
10: MIC1RP is selected for the MIC PGA with feed-forward resistance RIN = 20 kΩ.
11: MIC1RP is selected for the MIC PGA with feed-forward resistance RIN = 40 kΩ.
D3–D2 R/W 00 00: MIC1LM is not selected for the MIC PGA.
01: MIC1LM is selected for the MIC PGA with feed-forward resistance RIN = 10 kΩ.
10: MIC1LM is selected for the MIC PGA with feed-forward resistance RIN = 20 kΩ.
11: MIC1LM is selected for the MIC PGA with feed-forward resistance RIN = 40 kΩ.
D1–D0 R/W 00 Reserved. Write only zeros to these bits.
(1) Input impedance selection affects the microphone PGA gain. See the Analog Front End section for details.
Page 1 / Register 49 (0x31): ADC Input Selection for M-Terminal
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7–D6
(
R/W 00 00: CM is not selected for the MIC PGA.
1)
01: CM is selected for the MIC PGA with feed-forward resistance RIN = 10 kΩ.
10: CM is selected for the MIC PGA with feed-forward resistance RIN = 20 kΩ.
11: CM is selected for the MIC PGA with feed-forward resistance RIN = 40 kΩ.
D5–D4 00 00: MIC1LM is not selected for the MIC PGA.
01: MIC1LM is selected for the MIC PGA with feed-forward resistance RIN = 10 kΩ.
10: MIC1LM is selected for the MIC PGA with feed-forward resistance RIN = 20 kΩ.
11: MIC1LM is selected for the MIC PGA with feed-forward resistance RIN = 40 kΩ.
D3–D0 R/W 0000 Reserved. Write only zeros to these bits.
(1) Input impedance selection affects the microphone PGA gain. See the Analog Front End section for details.
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