AD1881 查看數據表（PDF） - Analog Devices

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AD1881

AC'97 SoundMAX® Codec

Analog Devices 

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Page 23

AD1881

CD Volume (Index 12b)

Reg

Nwn

NBDlC

DIS DI4 D13 D12 Dl1 DIO D9 D8 D7 D6 D5 D4 D3 D2 DI DO Def'ault

12h CD Volwne CVM X X LCV4 LCV3 LCV2 LCVl LCVO X X X RCV4 RCV3 RCV2 RCVI RCVO 880Sh

RCV[4:0]

Right CD Volume. Allows setting the CD right channel attenuator in 32 steps. The LSB represents 1.5 dB, and

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

LCV [4:0]

CVM

Left CD Volume. Allows setting the CD left channel attenuator in 32 steps. The LSB represents 1.5 dB, and the

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

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

Video Volume (Index I4h)

OBSOLETE Reg

Nwn

Natne

14h Video Volwne

D15 DI4 D13 D12 DI1 DI0 D9 08 07 06 05 04 03 02 01 00 Default

VM X X LVV4 LVV3 LVV1 LVVI LVVO X X X RVV4 RVV3 RVV1 RVVI RVVO 880Sh

RW[ 4:0]

LW [4:0]

VM

AUXVolume

Right Video Volume. Allows setting the Video right channel attenuator in 32 steps. The LSB represents 1.5 dB,

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

Left Video Volume. Allows setting the Video left channel attenuator in 32 steps. The LSB represents 1.5 dB, and

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

Video Mute. When this bit is set to "1," the channel is muted.

(Index I6b)

Reg

Nwn

Name

DI5 DI4 D13 D1Z DI1 DI0 09 D8 07 D6 05 D4 03 DZ DI DO Default

16h AWl Vol1UDe AM X X LAV4 LAV3 LAVZ LAVI LAVO X X X RAV4 RAV3 RAV2 RAVI RAVO 880Sh

RAV[4:0]

Right Aux. Volume. Allows setting the Aux right channel attenuator in 32 steps. The LSB represents 1.5 dB, and

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

IAV[4:0]

AM

Left Aux. Volume. Allows setting the Aux left channel attenuator in 32 steps. The LSB represents 1.5 dB, and the

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

Aux. Mute. When this bit is set to "1," the channel is muted.

PCM Out Volume (Index ISh)

Reg

Nwn

Natne

ISh

PCM Out

Volume

DI5 DI4 D13 DIZ Dll DID D9 D8 D7 D6 D5 D4 D3 DZ DI DO Default

OM X X LOV4 LOV3 LOVZ LOVI LOVO X X X ROV4 ROV3 ROV2 ROVI ROVO 880Sh

ROV[4:0]

LOV[4:0]

OM

Right PCM Out Volume. Allows setting the PCM right channel attenuator in 32 steps. The LSB represents 1.5 dB,

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

Left PCM Out Volume. Allows setting the PCM left channel attenuator in 32 steps. The LSB represents 1.5 dB,

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

PCM Out Volume Mute. When this bit is set to "1," the channel is muted.

Volume Table (Index OCh to I8h)

MM

x4 ...xO

Function

0

00000

0

01000

0

11111

1

xxxxx

+12 dB Gain

0 dB Gain

-34.5 dB Gain

-00 dB Gain

-14-

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