STA321

Audio Special Purpose Overview

The STA321 is a fully integrated digital audio processor from STMicroelectronics, designed for applications supporting up to four channels. It features an embedded CMOS bridge capable of delivering up to 0.5 W per channel into an 8-ohm load. The device includes a 16-bit stereo ADC with programmable gain amplifier and microphone biasing, alongside two independent serial audio interfaces accepting formats such as I2S. Key processing capabilities include a 4-channel sample rate converter (8 kHz to 192 kHz), flexible channel mapping, and up to 13 user-programmable 28-bit biquad filters per channel for equalization.

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
• Four channels of 24-bit audio processing with flexible routing
• 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 detection

Audio Special Purpose Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation, as packaging options vary between Tray and Tape & Reel configurations. Confirm the temperature grade, as standard variants are rated for 0°C to 70°C while industrial grades may differ. Ensure the LQFP-64 package with exposed pad matches the target PCB footprint requirements.

Audio Special Purpose Selection Notes

Select this component for designs requiring a single-chip solution for digital audio processing and amplification control. The device supports multiple output configurations including 2.0, 2.1, 4.0, and Mono setups. Consider the power supply voltage range of 3V to 3.6V and the operating temperature limits when defining the system environment.

Audio Special Purpose Part Context

The STA321 belongs to the Sound Terminal™ family, which provides complete digital audio solutions. It integrates digital signal processing with power stage control functions. The device is housed in a 64-LQFP package with an exposed thermal pad (EPD) measuring 10x10 mm, facilitating surface mount installation on printed circuit boards.

Audio Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.