Acer AO725 Acer Aspire One AO725 Netbook Service Guide - Page 45

Audio Codec and Amplifier Item Audio Controller Features Specification Realtek ALC271X-VB6 Hardware:  Meets WLP (Windows Logo Program) requirements for Windows XP, Vista and Windows 7  4-channel DAC supports 16/20/24-bit PCM format for independent two stereo channel or 2.1 audio playback  4-channel ADC supports 16/20/24-bit PCM format for independent two stereo channel audio inputs  All DACs supports 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 44.1/48/88.2/96/192kHz rate  Supports MONO line level output, and Stereo digital microphone input  Supports external PCBEEP input and built-in digital BEEP generator  Built-in headphone amplifiers for port-C (LINE1) and port-I (HP OUT)  Programmable +12/+24/+36db boost gain and volume control for analog microphone input  Headphone amplifier for port-I does not require DC blocking capacitors  Two jack detection pins each designed to detect up to 4 jacks, and S/PDIF-OUT jack detection is supported  2 GPIOs are supported for customized applications (pin shared with digital microphone interface)  EAPD (External Amplifier Power Down) is supported  Supports Anti-pop mode when analog power AVDD is on and digital power is off.  Support PC-Beep to internal speaker out (Port D) when no HDA control, while AVDD and PVDD is supplied.  Power support: 3.3V digital core power; 1.5V~3.3V digital IO power for HDA link; 3.0V~5.5V analog power; 4.5V~5.5V power stage voltage  Enhanced power management features for normal operation and standby mode  Stereo Bridge-Tied Load Class-D amplifier at port-D has 2Watt (rms)/4\ per channel output  Short circuit and thermal overload protection for Class-D amplifier  Class D amplifier has high pass filter with programmable Cut-Off frequency (10Hz~900Hz) to prevent low frequency signal damage speaker  Class D amplifier output with slew rate and spread spectrum control to improve EMI performance  Independent left and right channel of output power limiter (25%~100% power range) to protect speaker  Intel low power ECR compliant: supports power status control, jack detection, and wake-up event in D3 mode  Built in a 5V-to-4.5V linear regulator with 60dB PSRR to power analog circuitry  48-pin QFN 'Green' package Hardware Specifications and Configurations 1-35