AD1985 datasheet(17/48 Pages) AD

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AD1985

Rev. A | Page 17 of 48

Mono Volume Register (Index 0x06)

Reg Num

Name

D15

D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4

Default

0x06

Mono Volume

MVM

MV4

MV3

MV2

MV1

MV0

0x8000

This register controls the mono output volume and mute bit.

The volume register contains five bits, generating 32 volume

levels with increments of 1.5 dB each.

AC ’97 defines the 6-bit volume registers, therefore, to maintain

compatibility whenever the D5 bit is set to 1, its respective lower

five volume bits are automatically set to 1 by the codec logic. On

readback, all lower five bits will read 1s whenever this bit is set

to 1.

MV[4:0]

Mono Volume Control. The least significant bit represents 1.5 dB. This register controls the output from 0 dB to

a maximum attenuation of 46.5 dB.

MVM

Mono Volume Mute. When this bit is set to 1, the channel is muted.

Volume Settings for Mono

Control Bits D[4:0] for Mono (0x06)

D15

Write

Readback

Function

0 0000

0 dB Gain

0 1111

–22.5 dB Gain

1 1111

–46.5 dB Gain

x xxxx

–∞ dB Gain, Muted

Note that the x in the above table is a wild card, meaning the value has no effect.

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