ALC250 View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
ALC250 Datasheet PDF : 46 Pages
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ALC250 Data Sheet
6.1.1 MX00 Reset
Default: 0190h
Writing any value to this register will start a register reset, and causes all of the registers to revert to their default values, then the
written data is ignored. Reading this register returns the ID code of the specific part.
Bit Type
Function
15
14:10
9
8
7
6
5
4
3
2
1
0
Reserved
R Return 00000b
R Read as 0 (No support for 20-bit ADC)
R Read as 1 (Support for 18-bit ADC)
R Read as 1 (Support for 20-bit DAC)
R Read as 0 (No support for 18-bit DAC)
R Read as 0 (No support for Loudness)
R Read as 1 (Headphone output support)
R Read as 0 (No simulated stereo; for analog 3D block use)
R Read as 0 (No Bass & Treble Control)
R Reserved, Read as 0
R Read as 0 (No dedicated MIC PCM input)
6.1.2 MX02 Master Volume
Default: 8000h
These registers control the overall volume level of the output functions. Each step on the left and right channels correspond to
1.5dB in increase/decrease in volume.
Bit Type
Function
15
R/W Mute Control 0: Normal 1: Mute (-∞ dB)
14
Reserved
13:8 R/W Master Left Volume (MLV[5:0]) in 1.5 dB steps
7:6
Reserved
5:0
R/W Master Right Volume (MRV[5:0]) in 1.5 dB steps
For MRV/MLV: 00h 0 dB attenuation
3Fh 94.5 dB attenuation
6.1.3 MX04 Headphone
Default: 8000h
Register 04h controls the headphone (ALC250) output volume. Each step in bits 5:0 and 13:8 correspond to 1.5dB in
increase/decrease in volume, allowing 63 levels of volume, from 000000 to 111111.
Bit Type
Function
15
R/W Mute Control 0: Normal 1: Mute (-∞ dB)
14
Reserved
13:8 R/W Headphone/True Line Output Left Volume (HPL[5:0]) in 1.5 dB steps
7:6
Reserved
5:0
R/W Headphone/True Line Output Right Volume (HPR[5:0]) in 1.5 dB steps
For HPR/HPL: 00h 0 dB attenuation
3Fh 94.5 dB attenuation
Two Channel AC’97 2.3 Audio Codec
8
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