AD1981B

Rev. C | Page 19 of 32

RECORD SELECT CONTROL REGISTER

Index 0x1A

Reg No.

Name

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

0x1A

Record Select

X

X

X

X

X

LS2

LS1

LS0

X

X

X

X

X

RS2

RS1

RS0

0x0000

All registers are not shown, and bits containing an X are assumed to be reserved. Used to select the record source independently for right and left. The default value is

0x0000, which corresponds to MIC In. Refer to Table 24 for examples.

Table 23.

Bit

Function

RS [2:0]

Right Record Select

LS [2:0]

Left Record Select

Table 24. Settings for Record Select Control

LS [10:8]

Left Record Source

RS [2:0]

Right Record Source

000

MIC

000

MIC

001

CD_L

001

CD_R

010

Muted

010

Muted

011

AUX_L

011

AUX_R

100

LINE_IN_L

100

LINE_IN_R

101

Stereo Mix (L)

101

Stereo Mix (R)

110

Mono Mix

110

Mono Mix

111

PHONE_IN

111

PHONE_IN

RECORD GAIN REGISTER

Index 0x1C

Reg No.

Name

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

0x1C

Record Gain

IM

X

X

X

LIM3

LIM2

LIM1

LIM0

RM1

X

X

X

RIM3

RIM2

RIM1

RIM0

0x8000

If MSPLT is not set, the RM bit has no effect. All registers are not shown, and bits containing an X are assumed to be reserved. Refer to Table 24 for examples.

Table 25.

Bit

Mnemonic

Function

RIM [3:0]

Right Input Mixer Gain

Control

Each LSB represents 1.5 dB, 0000 = 0 dB, and the gain range is 0 dB to 22.5 dB.

RM

Right-Channel Mute

Once enabled by the MSPLT bit in Register 0x76, this bit mutes the right channel separately from the

IM bit. Otherwise, this bit always reads 0 and has no affect when set to 1.

LIM [3:0]

Left Input Mixer Gain

Control

Each LSB represents 1.5 dB, 0000 = 0 dB, and the gain range is 0 dB to 22.5 dB.

IM

Input Mute

When this bit is set to 1, both the left and right channels are muted, unless the MSPLT bit in

Register 0x76 is set to 1, in which case this mute bit affects only the left channel.