Texas Instruments Incorporated (TI) (NYSE:TXN) recently announced the TPA2050D4 analog-input audio subsystem. The TPA2050D4 integrates TI’s stereo Class-D power amplifier and stereo DirectPath headphone amplifier into one compact package. The audio subsystem is highly flexible, enabling customers to choose different input-to-output configurations and program design parameters to optimize audio performance. Integrating all amplifier channels into one integrated circuit reduces bill of materials, lowers cost, and enables sleeker end designs in wireless handsets, portable DVD players, portable gaming, and portable media players. 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.
- Stereo Class-D Amp:
- 1.4 W into 8 O from 5.0 V (10% THD + N)
- 1.25 W into 8 O; from 5.0 V (1% THD + N)
- DirectPath Stereo Headphone Amplifier
- No Output Capacitors Required
- Gain Select for Headphone Amplifier
- Eight Programmable Maximum Headphone Voltage Limits
- Two Single-Ended or One Differential Stereo Input
- 2:1 Input MUX with Mode Control
- 32-Step Volume Control for Both Input Channels
- Independent Shutdown for Headphone and Class-D Amplifiers
- Short-Circuit and Thermal-Overload Protection
- ±8 kV HBM ESD Protection on Headphone Outputs
- I2C Interface
- 25-Ball 2,61 mm × 2,61 mm WCSP
The TPA2050D4 audio subsystem includes a stereo Class-D amplifier which 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 audio 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 help headphone manufacturers prevent hearing damage at high volumes and enable compliance of maximum volume standards.
More info: TI TPA2050D4 (pdf)