Packard Bell EasyNote LJ77 Service Manual page 35

Audio Interface
Item
Audio Realtek ALC272 Azalia Codec and Amplifier G1454
Controller
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Power and Keyboard Controller
Item
Controller
Total number of keypads
Windows logo key
Internal & external keyboard
work simultaneously
Features
Chapter 1
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
KB926
99-/100-/103
Yes
Yes
Support Application keys for Windows XP version
Specification
Specification
25