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STMicro driver IC cuts cellphone component count

Posted: 04 Nov 2003 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? driver ic? audio amplifier? ts4851? ts4855?

STMicroelectronics has introduced a headset and speaker driver IC for mobile phones that includes an audio amplifier and digital volume control. The TS4851 offers controllable gain for left and right audio channels, plus a separate mono input for a microphone without a gain control. The product includes an audio amplifier that can deliver a typical 400mW of continuous RMS output power into an 8W load with 1 percent THD+N. A headset driver will drive a typical 30mW of continuous average power into each channel of a stereo 32 ohm bridged-tied load with 0.5 percent THD+N, given a 3.3V supply.

The TS4855 has an additional gain path that can be used for another input, such as a hands-free microphone. It includes an audio amplifier that can deliver a typical 1.1W of continuous RMS output power into an 8 ohm speaker with 1 percent THD+N. A headset driver will drive a typical 85mW of continuous average power into each channel of a stereo 32 ohm bridged-tied load with 0.5 percent THD+N, given a 5V supply.

Needing almost no external circuitry, both parts have a 32-step digital volume control and eight output modes, which control the combination of headset channels, speaker, inputs and volume that is used. The digital volume and output modes are controlled through a three-wire SPI bus interface.

Delivered in a flip chip package with 18 asymmetrically arranged bumps, the devices feature thermal shutdown protection and a 0.1?A current drain when in shutdown mode.





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