ALC202 AC’97 Audio CODEC
Draft Spec.
Preliminary
Version 0.62
September 26, 2001
1.Features
l Single chip audio CODEC with high S/N ratio (>90 dB).
l20-bit DAC, 18-bit ADC.
l Stereo full-duplex CODEC with independent and variable sampling rate.
l  4 analog line-level stereo input with 5-bit volume control : LINE_IN,CD,VIDEO,AUX l  2 analog line-level mono input : PC_BEEP,PHONE_IN.
l Mono output with 5-bit volume control.
l Stereo output with 6-bit volume control.
l  2 MIC inputs: Software selectable.
l Power management and enhanced power saving.
l3D Stereo Enhancement
l External Amplifier power down capability.
l Multiple CODEC extension.
l Compliant with AC’97 2.2 specification
l50mW/8W amplifier at LINE/ Headphone output
l Jack-detect function to mute LINE/MONO/HP output, to control S/PDIF output.
l Supports S/PDIF out is compliant with AC’97 rev2.2.
l  2 GPIO pins.
l14.318MHzà24.576MHz digital PLL.
l Supports double sampling rate (96KHz) of DVD audio playback.
l+30dB boost preamplifier for MIC input.
l Power support: Digital: 3.3V    Analog: 3.3V/5V
l Standard 48-Pin LQFP Package
2.Pin Description
typec转dp
XTLSEL=floating, the clock source is 24.576MHz crystal or external clock. (Default) XTLSEL=pull low, select 14.318MHzà24.576MHz digital PLL
The default state of MX7A.15 if power on latched inversely from XTLSEL.
2.7  Mixer Block Diagram
P C M  o u t
P C M  o u t

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