Audio subsystem integrates power and headphone amplifier

An analog-input audio subsystem has been introduced by Texas Instruments that integrates TI's stereo Class-D power amplifier and stereo DirectPath headphone amplifier into one package, designed to suit wireless handsets, portable DVD players, portable gaming and portable media players.

The TPA2050D4 audio subsystem includes a stereo Class-D amplifier that provides a 1.4-W per channel output drive capability into 8-Ohm loudspeakers with 90 percent efficiency to extend battery life in portable applications. The subsystem also features a low-noise stereo DirectPath headphone amplifier that eliminates the need for DC-blocking output capacitors to reduce component count.

The subsystem has two stereo single-ended inputs that can be configured as one stereo differential input to achieve better common-mode noise rejection. In addition, the user can program different gains and modes via a 1.8-V compatible I2C interface. For instance, each input channel has a 32-step volume control with an additional four-level gain control for the headphone amplifier. This allows the headphone volume to differ from the loudspeaker volume if both are used simultaneously, increasing flexibility for the consumer. The voltage limiter on the headphone amplifier helps to prevent hearing damage at high volumes and enable compliance of maximum volume standards.

The TPA2050D4 is available in a 2.61 mm x 2.61 mm WCSP package. The audio sub-system is available now, with a suggested resale pricing of $2.30 in 1,000-piece quantities. Samples and EVMs are available from

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