MiTAC 8355 service manual 5 AC’97 Audio System C-MEDIA Electronics INC., CMI9738-S

8355 N/B MAINTENANCE

1.2.5 AC’97 AUDIO SYSTEM: C-MEDIA ELECTRONICS INC., CMI9738-S

The CMI9738-S is an 18-bit, full duplex AC'97 2.2 compatible stereo audio CODEC designed for PC multimedia systems,including host/soft audio and AMR/CNR based designs. The CMI9738-S incorporates proprietary converter technology to achieve a high SNR, greater than 90 dB. The CMI9738-S AC'97 CODEC supports multiple CODEC extensions with independent variable sampling rates and built-in 3D effects. The CMI9738-S CODEC provides two pairs of stereo outputs with independent volume controls, a mono output, and multiple stereo and mono inputs, along with flexible mixing, gain and mute functions to provide a complete integrated audio solution for PCs.

Features

Single chip audio CODEC with high S/N ratio (>90dB)

Compliant with AC’97 2.2 & WHQL specifications

Support of S/PDIF out is compliant with AC’97 rev2.2 specifications

Meets performance requirements for audio on PC2001 systems

Meets Microsoft PC99 & WLP 2.0 audio requirements

18-bit Stereo full-duplex CODEC with independent and variable sampling rate

18-bit ADC and 20-bit DAC resolution

Four analog line-level stereo inputs with 5-bit volume control: LINE_IN, CD, VIDEO, AUX

High quality differential CD input

Two analog line-level mono input: PC_BEEP,PHONE_IN

Supports double sampling rate (96KHz) of DVD audio playback

Two software selectable MIC inputs

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