Digital input Class-D audio amplifier supports multiple speaker modes

The Texas Instruments TAS5755M is a single-chip flexible digital audio solution with integrated processing supporting 2.1 (2 speakers + subwoofer), 2.0 or stereo (2 speakers) and mono (high power speaker) modes. The devices high efficiency, low 80mOhm RDSON and pad-up package allow the device to output up to 2 × 50W or 1 × 100W. The device leverages two full H-bridges which are used for each channel in stereo mode. In 2.1 mode, the device runs two independent speaker channels using two half-bridges while using a full-bridge to drive a subwoofer. Finally, in mono mode, the device supports pre-filter parallel bridge tied load (PBTL) using only one filter stage to reduce total system size and cost. The device also has integrated audio processing. It includes: DC blocking filters, signal mixing, 2 × 8 + 1 × 2 biquads for equalization. Power limiting is executed by leveraging a two-band log-style DRC and a separate single-band DRC for the subwoofer channel.