STA321TR

Audio Special Purpose Overview

The STA321TR is a fully integrated digital audio processor from STMicroelectronics, designed for up to 4.0 channel applications. It features a high-efficiency FFX™ class-D modulator and an embedded CMOS bridge capable of delivering up to 0.5 W per channel into an 8-Ω load. The device supports two stereo channels with I2S input/output interfaces and includes a 16-bit stereo ADC with PGA and microphone biasing. Key specifications include a 100-dB dynamic range, four-channel input sample rate converter (8 kHz to 192 kHz), and four channels of 24-bit audio processing. It operates within a voltage supply range of 2.5V to 3.6V and an ambient temperature range of 0°C to 70°C.

Audio Special Purpose Feature Summary

• High efficiency FFX™ class-D modulator with 100-dB dynamic range
• Embedded CMOS bridge providing up to 0.5 W/channel output power
• Four channels of 24-bit audio processing with flexible channel mapping
• Integrated 16-bit stereo ADC with PGA and microphone biasing

Audio Special Purpose Applications

• Pre-amplifier systems
• Digital audio streaming to speakers
• Headphone outputs with jack detector

Audio Special Purpose Procurement Notes

Verify the ordering suffix 'TR' corresponds to the Tape & Reel packaging format as specified in the datasheet device summary table. Confirm the package type is LQFP-64 EPD (Exposed Pad Down) and that the component meets the commercial temperature grade of 0°C to 70°C. Ensure compatibility with the 2.5V to 3.6V supply voltage requirements during integration.

Audio Special Purpose Selection Notes

Select this component for designs requiring a single-chip solution for digital audio processing with integrated power stage capabilities. It is suitable for applications needing simultaneous play and record operations, soft volume updates, and muting functions. Consider the 64-LQFP package constraints and the need for external power devices if higher output power than the embedded bridge allows is required.

Audio Special Purpose Part Context

The STA321TR belongs to the Sound Terminal™ family, which combines digital audio processing with a digital power stage to provide full digital audio streaming. This family emphasizes cost-effectiveness, low energy dissipation, and sound enrichment. The TR suffix specifically denotes the tape and reel packaging variant, distinct from the tray-packaged STA321.

Audio Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.