ALC250 데이터 시트보기 (PDF) - Unspecified

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ALC250

TWO CHANNEL AC’97 2.3 AUDIO CODEC with EQUALIZER

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ALC250 Data Sheet

6.1.7 MX0E MIC Volume

Default: 8008h

Register 0Eh controls the microphone input volume. Each step in bits 4:0 correspond to 1.5dB in increase/decrease in volume,

allowing 32 levels of volume, from 00000 to 11111. Bit 6 enables/disables a boost in volume to a magnification based on bits 9:8.

Bit

15

14:10

9:8

7

6

5

4:0

Type

R/W

R/W

R/W

R/W

Function

Mute Control 0: Normal 1: Mute (-∞ dB)

Reserved

Boost Gain Option (BGO)

00: 20 dB 01: 6 dB 10: 12 dB 11: 29.5 dB (V=30*Vmic-in)

Reserved

Boost Control (BC)

0: Disable 1: Enable Boost

Reserved

Mic Volume (MV[4:0]) in 1.5 dB steps

For MV: 00h +12 dB Gain

08h 0dB gain

1Fh -34.5dB Gain

If 29.5dB boost gain is selected, input resistor can be reduced to save area of feedback resistor.

6.1.8 MX10 LINE_IN Volume

Default: 8808h

Register 10h controls the LINE_IN input volume. Each step in bits 4:0 correspond to 1.5dB in increase/decrease in volume for

the right channel, allowing 32 levels of volume, from 00000 to 11111. Each step in bits 12:8 correspond to 1.5dB in

increase/decrease in volume for the left channel, allowing 32 levels of volume, from 00000 to 11111.

Bit Type

Function

15

14:13

12:8

7:5

4:0

R/W Mute Control 0: Normal 1: Mute (-∞ dB)

Reserved

R/W Line-In Left Volume (NLV[4:0]) in 1.5 dB steps

Reserved

R/W Line-In Right Volume (NRV[4:0]) in 1.5 dB steps

For NLV/NRV:

00h +12 dB Gain

08h 0dB gain

1Fh -34.5dB Gain

6.1.9 MX12 CD Volume

Default: 8808h

Register 12h controls the CD input volume. Each step in bits 4:0 correspond to 1.5dB in increase/decrease in volume for the

right channel, allowing 32 levels of volume, from 00000 to 11111. Each step in bits 12:8 correspond to 1.5dB in

increase/decrease in volume for the left channel, allowing 32 levels of volume, from 00000 to 11111.

Bit Type

Function

15

R/W Mute Control 0: Normal 1: Mute (-∞ dB)

14:13

Reserved

12:8 R/W CD Left Volume (CLV[4:0]) in 1.5 dB steps

7:5

Reserved

4:0

R/W CD Right Volume (CRV[4:0]) in 1.5 dB steps

For CLV/CRV:

00h +12 dB Gain

08h 0dB gain

1Fh -34.5dB Gain

Two Channel AC’97 2.3 Audio Codec

10

Tel: +49(0)234-9351135 · Fax: +49(0)234-9351137 E-MAIL: info@cornelius-consult.de

Rev1.01

http://www.cornelius-consult.de

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