Packard Bell LJ75 Audio Interface Specification, Power and Keyboard Controller Specification

Audio Interface

Item		Specification
Audio	Realtek ALC272 Azalia Codec and Amplifier G1454
Controller
• 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

Power and Keyboard Controller

Item	Specification
Controller	KB926
Total number of keypads	99-/100-/103
Windows logo key	Yes
Internal & external keyboard	Yes
work simultaneously
Features	Support Application keys for Windows XP version

Chapter 1 25