LM4908 Datasheet, PDF (1/21 Pages) National Semiconductor (TI) – 10kV ESD Rated, Dual 120 mW Headphone Amplifier

February 2004
LM4908
10kV ESD Rated, Dual 120 mW Headphone Amplifier
General Description
The LM4908 is a dual audio power amplifier capable of
delivering 120mW per channel of continuous average power
into a 16Ω load with 0.1% (THD+N) from a 5V power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components using surface mount packaging. Since
the LM4908 does not require bootstrap capacitors or snub-
ber networks, it is optimally suited for low-power portable
systems.
The unity-gain stable LM4908 can be configured by external
gain-setting resistors.
Key Specifications
j THD+N at 1kHz at 120mW
continuous average output power
into 16Ω
j THD+N at 1kHz at 75mW
continuous average output power
into 32Ω
0.1% (typ)
0.1% (typ)
j Output power at 0.1% THD+N
at 1kHz into 32Ω
75mW (typ)
Features
n Up to 10kV ESD protection on all pins
n MSOP, SOP, and LLP surface mount packaging
n Switch on/off click suppression
n Excellent power supply ripple rejection
n Unity-gain stable
n Minimum external components
Applications
n Headphone Amplifier
n Personal Computers
n Portable electronic devices
Typical Application
20075201
*Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200752
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