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Monday, February 16, 2009

stereo headphone audio amplifier circuit

2 Cell Battery, 1mA, 42mW Per Channel High Fidelity
Stereo Headphone Audio Amplifier for MP3 players
The LM4980 is a stereo headphone audio amplifier, which
when connected to a 3.0V supply, delivers 42mW to a 16Ω
load with less than 1% THD+N. With the LM4980 packaged
in the SD package, the customer benefits include low profile
and small size. This package minimizes PCB area and maximizes
output power.
The LM4980 features circuitry that significantly reduces output
transients (“clicks” and “pops”) while driving headphones
during device turn-on and turn-off without costly external
additional circuitry. The LM4980 also includes an externally
controlled low-power consumption active-low shutdown
mode, and thermal shutdown. Boomer audio power amplifiers
are designed specifically to use few external components
and provide high quality output power in a surface
mount package.
- Output power
(RL = 16Ω, VDD = 3.0V, THD+N = 1%) 42mW (typ)
- Quiescent current (VDD = 3V) 1mA (typ)
- Micropower shutdown current 0.1µA (typ)
- Supply voltage operating range 1.5V <>
VDD = 3.0V 90dB (typ) - PSRR @ 217Hz, VDD = 3.0V 100dB (typ)
- 2-cell 1.5V to 3.3V battery operation
- Unity-gain stable
- “Click and pop” suppression circuitry for shutdown
and power on/off transient with headphone loads
- Active low micro
-power shutdown
- Thermal shutdown protection circuitry

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