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Stereo amplifier's low standby current reduces battery drain

Posted: 29 Jun 2005 ?? ?Print Version ?Bookmark and Share


STMicroelectronics' 2 x 1W stereo audio power amplifier with active low standby mode is said to deliver high-end audio capability to portable applications.

The TS4984 amplifier can be used in cellular mobile phones, notebooks, PDAs, LCD monitors, TVs and portable audio devices. It delivers 1W per channel of continuous rms output power at 5V into 8-ohm loads, with total harmonic distortion plus noise (THD+N) under 1 percent. It operates from 2.2V to 5.5V.

With a signal-to-noise (SNR) of 100dB (typical), and a power supply rejection ratio (PSRR) of 62dB at 217Hz with grounded inputs, this audio amplifier provides a high quality audio signal for the smallest of portable devices. Dedicated circuitry guarantees virtually no 'pop' and 'click' at power-on or power-off.

An external standby mode control reduces the supply current to less than 10nA for each channel. The device also has thermal shutdown protection. External resistors set the gain of each channel.

It is available in a QFN16 4-by-4mm, 0.5mm pitch, lead-free package. Pricing is 90 cents in 5,000 quantities.

- Bettyann Liotta


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