PCMD3140 datasheet(72/107 Pages) TI

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Figure 7-96. BIAS_CFG Register (continued)

RESERVED

MBIAS_VAL[2:0]

RESERVED

ADC_FSCALE[1:0]

R-0b

R/W-000b

R-00b

R/W-00b

Table 7-73. BIAS_CFG Register Field Descriptions

Bit

Field

Type

Reset

Description

RESERVED

Reserved bit; Write only reset value

6-4

MBIAS_VAL[2:0]

R/W

000b

MICBIAS value.

0d = Microphone bias is set to VREF (2.750 V, 2.500 V, or 1.375 V)

1d = Microphone bias is set to VREF x 1.096 (3.014 V, 2.740 V, or

1.507 V)

2d = Microphone bias is set to VCM = IN1M, for ADC single-ended

configuration

3d = Microphone bias is set to VCM = IN2M, for ADC single-ended

configuration

4d = Microphone bias is set to VCM = average of IN1M and IN2M,

for ADC single-ended configuration

5d = Microphone bias is set to VCM = internal crude common mode

6d = Microphone bias is set to AVDD

7d = MICBIAS configured as GPI2

3-2

RESERVED

00b

Reserved bits; Write only reset value

1-0

ADC_FSCALE[1:0]

R/W

00b

ADC full-scale setting (configure this setting based on the AVDD

supply minimum voltage used).

0d = VREF is set to 2.75 V to support 2 VRMS for the differential input

or 1 VRMS for the single-ended input

1d = VREF is set to 2.5 V to support 1.818 VRMS for the differential

input or 0.909 VRMS for the single-ended input

2d = VREF is set to 1.375 V to support 1 VRMS for the differential

input or 0.5 VRMS for the single-ended input

3d = Reserved; Don't use

7.6.1.30 CH1_CFG0 Register (Address = 0x3C) [Reset = 0x0]

CH1_CFG0 is shown in Figure 7-97 and described in Table 7-74.

Return to the Table 7-44.

This register is configuration register 0 for channel 1.

Figure 7-97. CH1_CFG0 Register

CH1_INTYP

CH1_INSRC[1:0]

CH1_DC

CH1_IMP[1:0]

RESERVED

CH1_AGCEN

R/W-0b

R/W-00b

R/W-0b

R/W-00b

R-0b

R/W-0b

Table 7-74. CH1_CFG0 Register Field Descriptions

Bit

Field

Type

Reset

Description

CH1_INTYP

R/W

Channel 1 input type.

0d = Microphone input

1d = Line input

6-5

CH1_INSRC[1:0]

R/W

00b

Channel 1 input configuration.

0d = Input Source is not enabled

1d = Analog single-ended input

2d = Digital microphone PDM input (configure the GPO and GPI pins

accordingly for PDMDIN1 and PDMCLK)

3d = Reserved; Don't use

CH1_DC

R/W

Channel 1 input coupling (applicable for the analog input).

0d = AC-coupled input

1d = DC-coupled input

PCMD3140

SBASA64 – DECEMBER 2020

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