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Audio subsystem improves capacity for handsets

Posted: 15 Aug 2008 ?? ?Print Version ?Bookmark and Share

Keywords:audio? wireless? analog? amplifier?

Texas Instruments Inc. has released an analog-input audio subsystem that combines its field-proven stereo Class-D power amplifier and stereo DirectPath headphone amplifier into one package. This has made the audio subsystem highly flexible, giving the customers a wide range of I/O configurations and program design selection to enhance audio performance. With these amplifier channels rolled into a compact circuit minimizes BOMs, lowers cost and creates sleeker end designs in consumer devices like wireless handsets, portable DVD players, portable gaming and portable media players.

The TPA2050D4 audio subsystem has a stereo Class-D amplifier that promises a 1.4W per channel output drive capability into 8 loudspeakers with 90 percent efficiency that stretches battery life in portable equipment. It is presented in a 2.61mm x 2.61mm wireless communication and signal processing package. The subsystem provides a low-noise stereo DirectPath headphone amplifier that draws away the necessity for DC-blocking output capacitors in lowering component count.

It also has two stereo single-ended inputs that can be made into one stereo differential input to get an improved common-mode noise rejection. The user can make different gains and modes via a 1.8V compatible I2C interface. For example, an input channel has a 32-step volume control with an additional four-level gain control for the headphone amplifier. This permits the headphone volume to vary from the loudspeaker volume if both are employed at the same time, heightening flexibility for the user. The voltage limiter on the headphone amplifier aids headphone vendors to keep from hearing damage at high volumes and provide compliance of maximum volume standards.

The TPA2050D4 is suitable to TI's wide portfolio for portables, like audio codecs (TLV320AIC3104, TLV320AIC33 and TLV320AIC34), DACs (TLV320DAC32, PCM1774), power management and DSP and OMAP processors or other integrated chipsets, such as LoCosto devices. Signal chain solutions and the industry's largest support network help designers to market their products.





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