General Description

The ALC202/ALC202A is an 18-bit, full duplexAC'97 2.2 compatible stereo audio CODEC designed for PC multimedia systems, including host/soft audio and AMR/CNR based designs. The ALC202 incorporates proprietary converter technology to achieve a high SNR, greater than 90 dB. The ALC202 AC'97 CODEC supports multiple CODEC extensions with independent variable sampling rates and built-in 3D effects.

Features

Single chip audio CODEC with high S/N ratio (>90 dB)
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
+30dB boost preamplifier for MIC input
Stereo output with 6-bit volume control
Mono output with 5-bit volume control
Headphone output with 50mW/8Ωdriving capability (ALC202)
Line output with 50mW/8Ωdriving capability (ALC202A)
Headphone jack-detect function to mute LINE/MONO/HP output, and to control S/PDIF output
3D Stereo Enhancement
Multiple CODEC extension capability
External Amplifier Power Down (EAPD) capability
High performance converter technology
Power management and enhanced power saving features 2 GPIO pins
No external crystal/clock required
14.318MHzÆ24.576MHz PLL saves crystal
DC Voltage volume control
Auxiliary power (VAUX ) to support Power Off CD function
Power support: Digital: 3.3V; Analog: 3.3V/5V
Standard 48-Pin LQFP Package