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Chapter 1 25
Audio Interface
Power and Keyboard Controller
Item Specification
Audio
Controller
Realtek ALC272 Azalia Codec and Amplifier G1454
• Features • HD Audio
• SNR > 85,High-performance DACs with 95dB SNR (A-Weighting), ADCs with
85dB SNR (A-Weighting)
• Internal Digital Microphone
• Two speakers, max. 1W output for each
• Meets performance and function requirements for Microsoft WLP 3.10, and stricter
performance requirements for future WLP
• Two stereo DAC support 16/20/24-bit PCM for two independent playback (multiple
streaming)
• Two stereo ADC supports 16/20/24-bit PCM format for two independent recording
• All DACs support independent 44.1k/48k/96k/192kHz sample rate
• All ADCs support independent 44.1k/48k/96k/192kHz sample rate
• Two independent SPDIF outputs support 16/20/24-bit format and 44.1k/48k/88.2k/
96k/192kHz rate
• All analog jack ports except MONO, BEEP-IN and HP-OUT are stereo input and
output re-tasking
• Supports line level mono output
• Supports analog PCBEEP input, and features an integrated digital BEEP
generator
• Support two stereo digital microphone input for microphone array AEC/BF
application
• Each stereo digital microphone interface has its own clock output to support
independent sample rate
• Supports legacy analog mixer architecture
• Built-in five headphone amplifiers on port-A and port-D, port-E, port-F and port-I.
• Headphone amplifier on port-I (HP-OUT) is designed to drive output without
external DC blocking capacitors
• Software selectable 2.5V and 3.2V reference output for microphone bias
• Software selectable boost gain (+10/+20/+30dB) for analog microphone input
• Two jack detection pins; each supports detection of up to 4 jacks
• Supports two GPIO (General Purpose Input/Output) pins (pin sharing with digital
microphone interface)
• Supports EAPD (External Amplifier Power Down) control for external amplifier
• Supports anti-pop mode when analog power AVDD is on and digital power is off
• Supports 1.5V~3.3V scalable I/O for HD Audio link
• 48-pin LQFP ‘Green’ package
Item Specification
Controller KB926
Total number of keypads 99-/100-/103
Windows logo key Yes
Internal & external keyboard
work simultaneously
Yes
Features Support Application keys for Windows XP version