Hardware Specifications and Configurations 1-35Audio Codec and AmplifierItem SpecificationAudioControllerRealtek ALC271XFeatures Meets WLP (Windows Logo Program) requirements for Windows XP,Vista and Windows 7 98dB Signal-to-Noise Ratio (A-weighting) for DAC output 90dB Signal-to-Noise Ratio (A-weighting) for ADC output 4-channel DAC supports 16/20/24-bit PCM format for indepent twostereo channel or 2.1 audio playback 4-channel ADC supports 16/20/24-bit PCM format for indepent twostereo channel audio inputs All DACs support 44.1k/48k/96k/192kHz sample rate All ADCs support 44.1k/48k/96k/192kHz sample rate S/PDIF-OUT support 16/20/24-bit format and 44.1/48/88.2/96/192kHzrate Supports MONO line level output Supports external PCBEEP input and built-in digital BEEP generator Software selectable 2.5V/3.2V VREFOUT as bias voltage for analogmicrophone input Programmable +12/+24/+36dB boot gain for analog microphone input Supports stereo digital microphone input Programmable boost gain and volume control for digital microphoneinput Built-in headphone amplifiers for port-C (LINE1) and port-I(HP OUT) Headphone amplifier for port-I does not require DC blockingcapacitors Two jack detection pins each designed to detect up to 4 jacks, andS/PDIF-OUT jack detection is supported EAPD (External Amplifier Power Down) is supported Supports Anti-pop mode when analog power AVDD is on and digitalpower is off Power support: 3.3V digital core power: 1.5V~3.3V digital IO power forHDA link; 3.0V~5.5V analog power; 4.5V~5.5V power stage voltage Enhanced power management features for normal operation andstandby mode Stereo Bridge-Tied Load Class-D amplifier at port-D has 2Watt (rms)/4Ohms per channel output Short circuit and thermal overload protection for Class-D amplifier Class D amplifier has high pass filter with programmable Cut-Offfrequency (10Hz~900Hz) to prevent low frequency signal damagespeaker Class D amplifier output with slew rate and spread spectrum control toimprove EMI performance Independent left and right channel of output power limiter(25%~100% power range) to protect speaker
