Preliminary Technical Data

AD1986

Rev. 0 | Page 21 of 52

LINE IN VOLUME (REGISTER 0x10)

This register controls the LINE_IN gain and mute to the analog mixer section. The volume register contains five bits, generating

32 volume steps of −1.5 dB each for a range of +12.0 dB to −34.5 dB. This does not control the record ADC gain (see Register 0x1C).

Reg

Name

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

0x10

Line In

Volume

LM

x

x

LV4

LV3

LV2

LV1

LV0

RM

x

x

RV4

RV3

RV2

RV1

RV0

0x8888

Table 37.

Register

Function

Controls the left/right channel gains of this input to the analog mixer from 12 dB to −34.5 dB. The least significant bit

represents −1.5 dB.

L/RM

L/RV [4:0]

Function

Default

0

0 0000

12 dB gain

0

0 1000

0 dB

Default

0

1 1111

−34.5 dB attenuation

L/RV [4:0]

(Left/Right

Volume)

1

x xxxx

Muted

L/RM

(Left/Right

Mute)

Mutes the left/right channels independently.

Default: muted (0x1)

x

Reserved.

Default: 0

CD VOLUME (REGISTER 0x12)

This register controls the CD gain and mute to the analog mixer section. The volume register contains five bits, generating 32 volume

steps of −1.5 dB each for a range of +12.0 dB to −34.5 dB. This does not control the record ADC gain (see Register 0x1C).

Many operating systems will play CDs directly using the digital data from the CD tracks. This control will only affect CD audio playback

if it is enabled for analog and this input is connected to the CD player analog connection.

Reg

Name

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

0x12

CD Volume

LM

x

x

LV4

LV3

LV2

LV1

LV0

RM

x

x

RV4

RV3

RV2

RV1

RV0

0x8888

Table 38.

Register

Function

Controls the left/right channel gains of this input to the analog mixer from +12 dB to –34.5 dB. The least significant bit

represents –1.5 dB.

L/RM

L/RV [4:0]

Function

Default

0

0 0000

12 dB gain

0

0 1000

0 dB

Default

0

1 1111

L/RV [4:0]

(Left/Right

Volume)

1

x xxxx

Muted

L/RM

(Left/Right

Mute)

Mutes the left/right channels independently.

Default: muted (0x1)

x

Reserved.

Default: 0