LM4854 1.9W Monaural, 85mW Stereo Headphone Audio
Amplifier
DESCRIPTION: The unity-gain stable LM4854 is both a mono differential
output (for bridge-tied loads, or BTL) audio power amplifier
and a single-ended (SE) stereo headphone amplifier. Operating
on a single 5V supply, the mono BTL mode delivers
1.1W (typ) to an 8Ohm load, 1.7W (typ) to a 4Ohm load at
1% THD+N. In SE stereo mode, the amplifier will deliver
85mW to 32Ohm loads.
The LM4854 features a new circuit topology that suppresses output transients (’click and pops’) and eliminates SE-mode output coupling capacitors, saving
both component and board space costs. The LM4854 has three inputs: one pair for a two-channel stereo signal and the third for a single-channel mono input.
The LM4854 is designed for PDA, cellular telephone, notebook,
and other handheld portable applications. It delivers
high quality output power from a surface-mount package and
requires few external components. Other features include an
active-low micropower shutdown mode, an "instant-on" low
power standby mode, and thermal shutdown protection.
FEATURES:
Fast 0.1ms (typ) and 1.0ms (max) turn-on and turn-off
time
Eliminates SE amplifier output coupling capacitors
Advanced "click and pop" suppression circuitry
Stereo headphone amplifier mode
Low-power standby and ultra-low current micropower
shutdown modes
Thermal shutdown protection circuitry
2.4V to 5.5V operation
Unity-gain stable
Gain set with external resistors
These are new and unused -- from manufacturer's original packaging.
