UNISONIC TECHNOLOGIES CO., LTD

LM4811

Preliminary

CMOS IC

www.unisonic.com.tw

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Copyright © 2011 Unisonic Technologies Co., Ltd

QW-R502-560.a

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

Halogen Free

Package

Packing

LM4811L-SM2-R

LM4811G-SM2-R

MSOP-10

Tape Reel