Publication date: June 2003
1
SDC00047AEB
ICs for Audio Common Use
AN12942B
Audio signal processing IC for notebook PC
„ Overview
AN12942B is an one-chip IC for the stereo speakers which can output 1 W by 8 Ω, headphone amplifiers, line amplifiers, and
electronic volumes.
The AGC circuit is built-in to prevent the resonance or the vibration by the speaker’s energy and the clipping distortion what is
called "broken up sound".
Also the AN12942B is built-in power saving on/off function automatically detecting input signal to save the power of speaker
amplifier.
„ Features
• Speaker amplifier
1 W × 2-channel: 8 Ω, V
CC
= 5 V
• Built-in AGC circuit
Prevention of the resonance or the vibration due to the speaker and the clipping distortion by AGC at excessive input signal
(with AGC on/off switch).
• Built-in automatic power saving function.
It detects input signals and switches on/off (with the on/off switch for the auto power saving).
•Built-in headphone amplifier and line amplifier
„ Applications
• Notebook PC
„ Package
• Dual surface implementing package (HSOP056-P-0300A)
„ Type
• Silicon monolithic bipolar IC