AD7820TQ

Overview

The AD7820TQZ is an 8-bit, single-channel analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It utilizes a flash architecture and features a parallel data interface with single-ended input capability. The device operates on dual 5 V power supplies for both analog and digital sections, consuming approximately 40 mW of power. It supports an external reference voltage typically set at 4.75 V. The component is designed for industrial environments, functioning within a temperature range of -40°C to +85°C. It is housed in a 20-lead TQFP package suitable for surface-mount applications.

Feature Summary

• Flash conversion architecture enables high-speed data acquisition.
• Parallel output interface allows direct connection to microcontrollers or DSPs.
• Low power consumption design suitable for battery-operated systems.
• Industrial temperature rating ensures reliable operation in harsh environments.

Applications

• Industrial process control systems requiring fast analog signal digitization.
• Medical equipment utilizing single-channel analog input processing.
• Test and measurement instruments needing precise 8-bit resolution.
• Motor control applications involving rapid feedback loop sampling.

Procurement Notes

Verify the complete part number suffix, such as 'TQZ', to confirm the specific tape-and-reel packaging and lead-free status. Confirm availability through authorized distributors as supply levels fluctuate. Ensure the procurement order matches the exact thermal and mechanical specifications required for the target PCB layout.

Selection Notes

Select this component when an 8-bit resolution and parallel interface are required for cost-effective data acquisition. Consider the TQFP package dimensions against available board space. Verify that the system can provide stable 5 V supplies and an external reference source. Evaluate if the flash architecture's speed meets the application's throughput requirements compared to successive approximation alternatives.

Part Context

The AD7820TQZ belongs to the AD7820 family of high-speed ADCs from Analog Devices. This series is characterized by its flash conversion technology, offering a balance between speed and resolution for general-purpose applications. The TQFP variant specifically addresses surface-mount assembly needs, providing a compact footprint while maintaining the electrical performance of the broader AD7820 product line.

Replacement Considerations

Check for pin-compatible alternatives within the same manufacturer's portfolio. Verify that any substitute maintains the 8-bit resolution, parallel interface, and 5 V operating voltage. Ensure the replacement package matches the 20-lead TQFP form factor to avoid PCB redesign efforts.