12.15.2008 02:36 PM
STMicroelectronics offers combined analog switch/audio amplifier IC
This Christmas handset and media player designers will be unwrapping simpler board design with more available real estate thanks to STMicroelectronics' new dual-function chip. The TS4961T consolidates an analog switch that achieves –80dB isolation and a 1.6W Class D amplifier in a single package that lets designers implement both functions within a 3mm by 3mm QFN16 footprint, instead of using two separate components.
The TS4961T is optimized for battery-operated devices. It operates within a 2.4V-4.3V supply voltage range, consuming 2mA operating current at 3V, and features a 10nA shutdown mode to extend battery life. The amplifier drives up to 1.6W into a 4ohm load, or 0.95W into an 8ohm 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 like 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 and reduces power consumption. Thermal shutdown protection is also included.
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