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LM4920 Datasheet

  • LM4920

  • Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo ...

  • 17頁

  • NSC

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LM4920 Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier
March 2006
LM4920
Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW
Stereo Headphone Amplifier
General Description
The LM4920 is a ground referenced, fixed-gain audio power
amplifier capable of delivering 80mW of continuous average
power into a 16鈩?single-ended load with less than 1%
THD+N from a 3V power supply.
The LM4920 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 elimi-
nating 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 amount of
external components. The LM4920 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4920 features a low-power consumption shutdown
mode selectable for either channel separately. This is ac-
complished 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 shut-
down. Additionally, the LM4920 features an internal thermal
shutdown protection mechanism.
The LM4920 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4920 has an internal fixed gain of 1.5V/V.
Key Specifications
j
Improved PSRR at 217Hz
j
Power Output at V
DD
= 3V,
70dB (typ)
80mW (typ)
0.01碌A(chǔ) (typ)
1.5V/V (typ)
1.6V to 4.2V
R
L
= 16鈩? THD
%
1%
j
Shutdown Current
j
Internal Fixed Gain
j
Operating Voltage
Features
Fixed Logic Levels
Ground referenced outputs
High PSRR
Available in space-saving micro SMD package
Ultra low current shutdown mode
Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n
No output coupling capacitors, snubber networks,
bootstrap capacitors, or gain-setting resistors required
n
Shutdown either channel independently
n
n
n
n
n
n
Applications
n
n
n
n
n
Mobile Phones
MP3 Players
PDAs
Portable electronic devices
Notebook PCs
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2006 National Semiconductor Corporation
DS201793
www.national.com

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