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FAB1200 — Ground-Referenced Class-G Headphone Amplifier with Integrated Buck Converter
June 2013
FAB1200 Class-G Ground-Referenced Headphone
Amplifier with Integrated Buck Converter
Features
Class-G Headphone Amplifier Uses Multiple
Rails for High Efficiency
Integrated Inductive Buck Converter for Direct
Battery Connection
Differential Analog Inputs
Capable of Driving 16 Ω to 600 Ω Loads and Line
Level Inputs
Ground-Referenced Output
Ground-Sense Input Eliminates Ground-Loop
Noise
I
2
C Controls
32-Step Volume Control
Channel-Independent Shutdown Control
and Short-Circuit Protection
1µF
OUTR
INR+
1µF
Volume
Control and
Level
Detector
Class G
Headphone
Amplifiers
OUTL
1µF
SGND
INL+
1µF
SCL
SDA
I
2
C
INR-
2.2µF
Description
The FAB1200 is a stereo class-G headphone
amplifier. A charge pump generates a negative supply
voltage that allows its output to be ground centered.
An integrated buck regulator adjusts the voltage
supplies between two different levels based on the
微控制器 MCU
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