TDA8424/V7,112

Overview

The TDA8424 is a monolithic bipolar integrated stereo sound circuit designed for hi-fi audio and television sound applications. It features digital control via the I²C-bus, allowing a microcontroller to manage functions such as volume, balance, bass, treble, mute, and mode selection (stereo, spatial stereo, forced mono). The device operates on a positive supply voltage ranging from 10.8V to 13.2V. Key electrical specifications include an 86dB signal-plus-noise-to-noise ratio at 0dB gain, 0.05% total harmonic distortion at +6dB gain, and 80dB channel separation at 10kHz. It is housed in a 20-DIP package.

Feature Summary

• I²C-bus digital control for volume, balance, tone, and mode switching
• Stereo, spatial stereo, and forced mono operation modes
• Volume control range of -64dB to +6dB with 2dB steps
• Bass control: -12dB to +15dB; Treble control: -12dB to +12dB

Applications

• Hi-Fi stereo audio systems
• Television sound processing

Procurement Notes

Verify component authenticity through authorized NXP distributors or certified suppliers. Confirm the package type is 20-DIP (SOT146) and check for RoHS compliance status. Ensure the operating temperature range of 0°C to 70°C aligns with system requirements. Review the datasheet for specific I²C timing constraints and power-on reset behavior during integration.

Selection Notes

Select this component for applications requiring digital audio processing with I²C interface compatibility. Ensure the power supply provides a stable 12V nominal voltage within the 10.8V to 13.2V range. Verify that the microcontroller supports standard I²C protocols for address MAD and subaddress SAD transmission. Consider the 20-DIP package size for through-hole mounting constraints.

Part Context

The TDA8424 belongs to the Philips/NXP audio processor family, specifically designed for analog audio signal conditioning with digital control capabilities. It serves as a bridge between digital control systems and analog audio outputs, integrating tone controls and amplification stages into a single IC. This part is distinct from purely digital DSPs by handling analog input/output signals directly.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. When replacing, ensure the new component matches the 20-DIP footprint, I²C communication protocol, and voltage supply range. Verify pin compatibility, particularly for SDA, SCL, and audio inputs/outputs.