Global American 3307880, User Manual, Page: 30 / 107

3307880 PCI CPU Card
2.16 Audio Codec
The 3307880 has an integrated RealTek ALC203 codec. The RealTek ALC203 is a 20-bit
DAC and 18-bit ADC full-duplex AC'97 2.3 compatible stereo audio CODEC designed for
PC multimedia systems, including host/soft audio, and AMR/CNR based designs. The
codec meets performance requirements for audio on PC99/2001 systems
Single chip with high S/N ratio (>100 dB)
Meets performance requirements for audio on PC2001 systems
Meets Microsoft WHQL/WLP 2.0 audio requirements
20-bit DAC and 18-bit ADC resolution
18-bit Stereo full-duplex CODEC with independent and variable sampling rate
Complies with AC'97 2.3 specifications
o
LINE/HP-OUT, MIC-IN and LINE-IN sensing
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14.318MHz -> 24.576MHz PLL saves crystal
o
12.288MHz BITCLK input can be consumed
o
Integrated PCBEEP generator to save buzzer
o
Interrupt capability
o
Page registers and Analog Plug & Play
Support of S/PDIF out is fully compliant with AC'97 rev2.3 specifications
Three analog line-level stereo inputs with 5-bit volume control: LINE_IN, CD,
AUX
High quality differential CD input
Two analog line-level mono input: PCBEEP, PHONE-IN
Supports double sampling rate (96KHz) of DVD audio playback
Two software selectable MIC inputs
+6/12/20/30dB boost preamplifier for MIC input
Stereo output with 6-bit volume control
Mono output with 5-bit volume control
Headphone output with 50mW/20Ohm amplifier
3D Stereo Enhancement
Multiple CODEC extension capability
External Amplifier Power Down (EAPD) capability
Power management and enhanced power saving features
Stereo MIC record for AEC/BF application
DC Voltage volume control
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