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LM48820

National Semiconductor
Part Number LM48820
Manufacturer National Semiconductor
Description 95mW Stereo Headphone Amplifier
Published Oct 28, 2010
Detailed Description www.DataSheet.in LM48820 Ground-Referenced, Ultra Low Noise, Fixed Gain, 95mW Stereo Headphone Amplifier June 2007 LM...
Datasheet PDF File LM48820 PDF File

LM48820
LM48820

Overview
www.
DataSheet.
in LM48820 Ground-Referenced, Ultra Low Noise, Fixed Gain, 95mW Stereo Headphone Amplifier June 2007 LM48820 Ground-Referenced, Ultra Low Noise, Fixed Gain, 95mW Stereo Headphone Amplifier General Description The LM48820 is a ground referenced, fixed-gain audio power amplifier capable of delivering 95mW of continuous average power into a 16Ω single-ended load, with less than 1% THD +N from a 3V power supply.
The LM48820 features a new circuit technology that utilizes a charge pump to generate a negative reference voltage.
This allows the outputs to be biased about ground, thereby eliminating output-coupling capacitors typically used with normal single-ended loads.
Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal number of external components.
The LM48820 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other portable applications.
The LM48820 features a low-power consumption shutdown mode selectable for each channel and a soft start function that reduces start-up current transients.
Additionally, the LM48820 features an internal thermal shutdown protection mechanism.
The LM48820 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions.
The LM48820 has an internal fixed gain of 1.
5V/V.
Key Specifications ■ Improved PSRR at 217Hz ■ Power Output at VDD = 3V, RL = 16Ω, THD+N = 1% 95mW (typ) 0.
05µA (typ) 1.
5V/V (typ) 1.
6V to 4.
5V 80dB (typ) ■ Shutdown Current ■ Internal Fixed Gain ■ Wide Operating Voltage Range Features ■ Available in space saving 0.
4mm pitch micro SMD ■ ■ ■ ■ ■ package Fixed Logic Levels Ground referenced outputs High PSRR Ultra low current shutdown mode Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions ■ No output coupling capacitors, snubber networks, bootstrap capacitors, or gain-setting r...


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