描述 Description

General Description
The LM4830 is an integrated solution for two-way audio amplification. It contains a bridge-connected audio power amplifier capable of delivering 1W of continuous average power to an 8? load with less than 1% THD from a 5V power supply. It also has the capability of driving 100 mW into a single-ended 32? impedance for headset operation. There is a 30 dB attenuator in front of a bridged power amplifier with 6 dB of gain. The attenuation is controlled through 4 bits of parallel digital control; 15 steps of 2 dB each.Key Specifications
THD at 1W cont. avg PO into 8?: 1% (max)
Instantaneous peak output power: 1.4W
Shutdown current: 0.5 μA (typ)
Supply voltage range: 2.7V ≤ V DD ≤ 5.5V

Features
4-bit digital control for 30 dB of volume attenuation
Two selectable microphone inputs
High performance microphone preamp
Extra buffer for driving long cables
No bootstrap capacitors or snubber circuits are
necessary
Small Outline (SO) packaging
Thermal shutdown protection circuitry

Applications
Hands-free phone systems
Mobile phone accessories
Desktop conference phones
Portable computers
Teleconference computer applications