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
