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TI audio power amp has dc volume control

Posted: 23 Sep 2003 ?? ?Print Version ?Bookmark and Share

Keywords:audio power amplifier? texas instruments? ti? tpa2008d2?

Expanding its portfolio of audio power amplifiers for LCD flat panel displays, LCD projection and powered speakers, Texas Instruments (TI) Inc. has introduced what it claims is the industry's first 5V filter-free class-D audio power amplifier that features an integrated dc volume control with 2dB steps from -38dB to 20dB.

The gain of the TPA2008D2, which affects the output power level, is controlled by a dc voltage applied to the volume pin. At full power, the product will drive 6W into 3 ohm speakers with no external heatsink.

Eliminating the external heatsink is made possible from its high efficiency of over 80 percent. The efficiency reduces heat in the system and reduces current requirements from the power supply. Half power total harmonic distortion plus noise is 0.045 percent at 1kHz, noise floor is -80dBV, and PSRR is -70dB.

Suitable for 15-inch to 17-inch LCD TV receivers and multi-function monitors, the audio amplifier also features a supply current of 7mA, and shutdown control of 1?A. Offered in a standard PowerPAD surface mount 24-pin TSSOP package, the product is priced at $1.80 for 1,000-piece quantities.

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