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Chip fuses analog switch, Class D amp in single casing

Posted: 05 Dec 2008 ?? ?Print Version ?Bookmark and Share

Keywords:amplifier Class D? switch analog?


By consolidating an analog switch achieving -80dB isolation and a 1.6W class D amplifier in a single package, the TS4961T simplifies board design and saves space in cellphones and personal media players, claims STMicroelectronics. Using this device, designers can implement both functions within a 3m x 3mm QFN16 footprint instead of using two separate components, adds the company.

The TS4961T is optimized for use in battery-operated devices. The combination switch/amplifier operates within 2.4V to 4.3V supply voltage range, consuming 2mA operating current at 3V, and featuring a 10nA shutdown mode load or to extend battery life. The amplifier drives up to 1.6W into a 4? load or 0.95W into an 8? load.

The integrated audio switch is a dual SPST CMOS device that enables higher channel isolation than comparable combined amplifier/switch ICs. Break-before-make switching enables reliable command of line-out and speaker-out sources, such as the baseband audio and codec output in a cell phone. The filterless class-D amplifier achieves less than 1 percent total harmonic distortion, low pop and click noise, and power supply rejection up to -63dB at 217Hz. The gain is adjusted using two external resistors. By achieving 88 percent operating efficiency, the amplifier helps simplify thermal management, as well as reducing power consumption, enabling further savings in size, cost and weight of the end product. Thermal shutdown protection is also included.

The TS4961T features RoHS-compliant ECOPACK packaging, is available immediately in sample or production quantities, and is priced at $1 for orders over 1,000 pieces.

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