AD790JR

Overview

The AD790JR is a fast, precision voltage comparator manufactured by Analog Devices Inc. in an 8-lead SOIC package. It features a maximum propagation delay of 45 ns and operates from single 5 V or dual ±15 V supplies. The device includes an onboard latch, CMOS/TTL compatible outputs, and handles up to 15 V differential input voltage. It dissipates 60 mW and functions within a commercial temperature range of 0°C to 70°C.

Feature Summary

• Features a low-glitch output stage that minimizes power supply disturbances and prevents unwanted oscillations during switching.
• Incorporates built-in hysteresis to ensure stable operation when input signals slowly cross the reference threshold.
• Supports ground-referred inputs in single-supply mode and handles large amplitude differential signals in dual-supply configurations.

Applications

• Zero-Crossing Detectors
• Overvoltage Detectors
• Pulse-Width Modulators
• Precision Rectifiers

Procurement Notes

Verify the specific suffix against the official ordering guide to confirm package type and temperature rating. Ensure the procurement documentation matches the required performance grade for the intended operating environment. Cross-reference pinouts with the datasheet outline dimensions to prevent installation errors in surface-mount designs.

Selection Notes

Select this component for applications requiring high-speed response combined with precise voltage resolution. The integrated latch function supports synchronous data acquisition systems. Consider the low power dissipation relative to its speed class when designing thermally constrained circuits.

Part Context

This part belongs to the AD790 family of monolithic comparators fabricated using Analog Devices' Complementary Bipolar process. The series offers various performance grades and packaging options, including plastic DIP, ceramic Cerdip, and SOIC formats, catering to diverse industrial and commercial requirements.

Replacement Considerations

Direct substitutes include AD790JRZ and AD790JR-REEL7, which share identical electrical characteristics and pinout configurations. Verify thermal resistance values if replacing units with different package styles to maintain adequate heat dissipation.

FAQ

How does the AD790 handle bipolar signals with a single 5V supply?

The AD790 can receive bipolar signals while powered by a single 5V supply by clamping one input slightly below ground, allowing it to switch around that level and produce logic-compatible outputs.

What is the purpose of the onboard latch on Pin 5?

The latch function retains the comparator's decision at the output. Bringing Pin 5 low holds the output state regardless of changing inputs, enabling synchronous operation.