UNISONIC TECHNOLOGIES CO., LTD
LM4811
Preliminary
CMOS IC
DUAL 105mW HEADPHONE
AMPLIFIER WITH DIGITAL
VOLUME CONTROL AND
SHUTDOWN MODE
DESCRIPTION
The UTC
LM4811
is a dual audio power amplifier with digital
volume control and shutdown mode function. It is featured in
unity-gain stability. The digital volume control sets the amplifier’s
gain from +12dB to -33dB in 16 discrete steps using a two-wire
interface. The shutdown mode is externally controlled, active-high
and micropower consumption. An internal thermal shutdown
protection circuit is contained in the device.
Operating on a 5V power supply, it can drive 16Ω load at
105mW per channel of continuous average power with 0.1%
(THD+N).
This device is mainly used to provide customers with higher
quality output power but less required external components. The
UTC
LM4811
reduces the use of bootstrap capacitors or snubber
networks that make making it ideal for low-power portable systems
applications.
The UTC
LM4811
is generally applied in cellular phones, MP3,
CD, DVD players, PDA’s and other portable electronics.
FEATURES
* Digital volume control range: +12dB~ -33dB
* "Click and Pop" suppression circuitry
* Saving the use of bootstrap capacitors
* Low shutdown current
ORDERING INFORMATION
Ordering Number
Lead Free
LM4811L-SM2-R
Halogen Free
LM4811G-SM2-R
Package
MSOP-10
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co., Ltd
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