AD1981B

Rev. C | Page 17 of 32

CD VOLUME REGISTER

Index 0x12

Reg No.

Name

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

0x12

CD Volume

CVM

X

X

LCV4

LCV3

LCV2

LCV1

LCV0

RM1

X

X

RCV4

RCV3

RCV2

RCV1

RCV0

0x8808

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 22 for examples.

Table 19.

Bit

Mnemonic

Function

RCV [4:0]

Right CD Volume

Allows setting the CD right-channel attenuator in 32 volume levels. The LSB represents 1.5 dB, and the

gain range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.

RM

Right-Channel Mute

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

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

LCV [4:0]

Left CD Volume

Allows setting the CD left-channel attenuator in 32 volume levels. The LSB represents 1.5 dB, and the

gain range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.

CVM

CD Volume 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.

AUX VOLUME REGISTER

Index 0x16

Reg No.

Name

D15

D14

D13

D12

D11

D1

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

0x16

AUX Volume

AM

X

X

LAV4

LAV3

LAV2

LAV1

LAV0

RM1

X

X

RAV4

RAV3

RAV2

RAV1

RAV0

0x8808

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

for examples.

Table 22

Table 20.

Bit

Mnemonic

Function

RAV [4:0]

Right AUX Volume

Allows setting the AUX right-channel attenuator in 32 volume levels. The LSB represents 1.5 dB, and

the gain range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.

RM

Right-Channel Mute

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

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

LAV [4:0]

Left AUX Volume

Allows setting the AUX left-channel attenuator in 32 volume levels. The LSB represents 1.5 dB, and

the gain range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.

AM

AUX Volume 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.