CS47L35 datasheet(36/300 Pages) CIRRUS

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DS1085F3

CS47L35

4.2 Input Signal Path

4.2.7

Input Signal Path Digital Volume Control

A digital volume control is provided on each input signal path, providing –64 dB to +31.5 dB gain control in 0.5-dB steps.

An independent mute control is also provided for each input signal path.

R788 (0x0314)

IN1R_Control

IN1R_HPF

Input Path 1 (Right) HPF Enable

0 = Disabled

1 = Enabled

7:1 IN1R_PGA_

VOL[6:0]

0x40 Input Path 1 (Right) PGA Volume (applicable to analog inputs only)

0x00 to 0x3F = Reserved

0x40 = 0 dB

0x41 = 1 dB

0x42 = 2 dB

… (1-dB steps)

0x5F = 31 dB

0x60 to 0x7F = Reserved

R789 (0x0315)

ADC_Digital_

Volume_1R

14:13 IN1R_

SRC[1:0]

Input Path 1 (Right) Source

00 = Differential (IN1ARP–IN1ARN)

01 = Single-ended (IN1ARP)

10 = Differential (IN1BRP–IN1BRN)

11 = Single-ended (IN1BRP)

R790 (0x0316)

DMIC1R_Control

5:0 IN1R_

DMIC_

DLY[5:0]

0x00 Input Path 1 (Right) Digital Delay (applicable to digital input only)

LSB = 1 sample, Range is 0 to 63.

(Sample rate is controlled by IN1_OSR.)

R792 (0x0318)

IN2L_Control

IN2L_HPF

Input Path 2 (Left) HPF Enable

0 = Disabled

1 = Enabled

12:11 IN2_DMIC_

SUP[1:0]

Input Path 2 DMIC Reference Select (sets the DMICDAT2 and DMICCLK2 logic levels)

00 = MICVDD

01 = MICBIAS1B

10 = MICBIAS2A

11 = MICBIAS2B

IN2_MODE

Input Path 2 Mode

0 = Analog input

1 = Digital input

7:1 IN2L_PGA_

VOL[6:0]

0x40 Input Path 2 (Left) PGA Volume (applicable to analog inputs only)

0x00 to 0x3F = Reserved

0x40 = 0 dB

0x41 = 1 dB

0x42 = 2 dB

… (1-dB steps)

0x5F = 31 dB

0x60 to 0x7F = Reserved

R793 (0x0319)

ADC_Digital_

Volume_2L

14:13 IN2L_

SRC[1:0]

Input Path 2 (Left) Source

00 = Differential (IN2LP–IN2LN)

01 = Single-ended (IN2LP)

10 = Reserved

11 = Reserved

R794 (0x031A)

DMIC2L_Control

10:8 IN2_

OSR[2:0]

101

Input Path 2 DMIC Oversample Rate (applicable to digital inputs only).

000 = Reserved

001 = Reserved

010 = 384 kHz

011 = 768 kHz

100 = 1.536 MHz

101 = 3.072 MHz

110 = 6.144 MHz

111 = Reserved

If IN2_OSR=010 or 011, the maximum Input Path sample rate (all input paths) is 48 kHz or

96 kHz respectively.

5:0 IN2L_

DMIC_

DLY[5:0]

0x00 Input Path 2 (Left) Digital Delay (applicable to digital input only)

LSB = 1 sample, Range is 0 to 63.

(Sample rate is controlled by IN2_OSR.)

R796 (0x031C)

IN2R_Control

IN2R_HPF

Input Path 2 (Right) HPF Enable

0 = Disabled

1 = Enabled

7:1 IN2R_PGA_

VOL[6:0]

0x40 Input Path 2 (Right) PGA Volume (applicable to analog inputs only)

0x00 to 0x3F = Reserved

0x40 = 0 dB

0x41 = 1 dB

0x42 = 2 dB

… (1-dB steps)

0x5F = 31 dB

0x60 to 0x7F = Reserved

R797 (0x0319)

ADC_Digital_

Volume_2R

14:13 IN2R_

SRC[1:0]

Input Path 2 (Right) Source

00 = Differential (IN2RP–IN2RN)

01 = Single-ended (IN2ARP)

10 = Reserved

11 = Reserved

R798 (0x031E)

DMIC2R_Control

5:0 IN2R_

DMIC_

DLY[5:0]

0x00 Input Path 2 (Right) Digital Delay (applicable to digital input only)

LSB = 1 sample, Range is 0 to 63.

(Sample rate is controlled by IN2_OSR.)

Table 4-3. Input Signal Path Configuration (Cont.)

Bit

Label

Default

Description

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