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LM4922

National Semiconductor
Part Number LM4922
Manufacturer National Semiconductor
Description 80mW Stereo Headphone Amplifier
Published May 14, 2010
Detailed Description LM4922 Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier December 2005 LM4922 Ground-Ref...
Datasheet PDF File LM4922 PDF File

LM4922
LM4922

Overview
LM4922 Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier December 2005 LM4922 Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier General Description The LM4922 is a ground referenced, fixed-gain audio power amplifier capable of delivering 80mW of continuous average power into a 16Ω single-ended load with less than 1% THD+N from a 3V power supply.
The LM4922 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 elimiwww.
DataSheet4U.
com nating output-coupling capacitors typically used with normal single-ended loads.
The LM4922 features an Automatic Standby Mode circuitry (patent pending).
In the absence of an input signal, after approximately 12 seconds, the LM4922 goes into low current standby mode.
The LM4922 recovers into full power operating mode immediately after a signal is applied to either the left or right input pins.
This feature saves power supply current in battery operated applications.
Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components.
The LM4922 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement.
The LM4922 features a low-power consumption shutdown mode selectable for either channel separately.
This is accomplished by driving either the SD_RC (Shutdown Right Channel) or SD_LC (Shutdown Left Channel) (or both) pins with logic low, depending on which channel is desired shutdown.
Additionally, the LM4922 features an internal thermal shutdown protection mechanism.
The LM4922 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions.
The LM4922 has an internal fixed gain of 1.
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