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