TDA7309

Audio Special Purpose Overview

The TDA7309 is a digital controlled stereo audio processor manufactured by STMicroelectronics. It features independent left and right volume control with 1dB step resolution, selectable external loudness, and soft mute functions. The device operates on a 6V to 10V supply voltage and communicates via an I2C bus interface. Key electrical specifications include a signal-to-noise ratio of 106 dB, total harmonic distortion of 0.1%, and channel separation of 100 dB at 1 kHz. It supports three stereo inputs and includes a record output function.

Audio Special Purpose Feature Summary

• Independent left and right volume control with 1dB steps
• Three stereo inputs with input multiplexer
• I2C bus programmable for all functions
• Selectable external loudness and soft mute

Audio Special Purpose Applications

• Audio Systems

Audio Special Purpose Procurement Notes

Verify the specific package type required (DIP20 or SO20) as the base model number covers multiple packages. Confirm availability status, as distribution listings indicate this product may be discontinued. Ensure the design accommodates the 6V to 10V operating voltage range and I2C pull-up requirements.

Audio Special Purpose Selection Notes

Select the DIP20 variant for through-hole mounting or SO20 for surface mount applications. Consider the 106 dB SNR and low THD for high-fidelity audio paths. Verify that the microcontroller interface supports the standard I2C protocol with appropriate clock frequencies up to 400 kHz.

Audio Special Purpose Part Context

The TDA7309 belongs to the TDA73xx series of audio processors from STMicroelectronics. It is designed for quality audio applications requiring precise digital control over analog signal parameters. The component utilizes Bipolar/CMOS technology to achieve low distortion and noise performance.

Audio Special Purpose Replacement Considerations

Check for active equivalents in the TDA73xx family. Verify pin compatibility if substituting with other stereo audio processors. Note that the TDA7309D is the SO20 package version of this part.