AD9631ANZ

Overview

The AD9631ANZ is a high-speed, wide-bandwidth voltage feedback operational amplifier manufactured by Analog Devices Inc. It operates within an industrial temperature range of -40°C to +85°C and is housed in an 8-lead PDIP package. The device features a small-signal bandwidth of 320 MHz and a large-signal bandwidth of 175 MHz at a gain of +1. Key electrical specifications include a slew rate of 1300 V/µs, a settling time of 16 ns to 0.01% for a 2 V step, and an input voltage noise density of 7.0 nV/√Hz. It supports supply voltages from ±3 V to ±6 V with a typical quiescent current of 17 mA.

Feature Summary

• Combines the fast pulse response and wide bandwidth of current feedback amplifiers with the predictable classical structure of voltage feedback architectures.
• Provides ultralow distortion performance with high third-order intercept points suitable for demanding signal processing applications.
• Features exceptionally fast settling times and high slew rates to maintain accuracy during rapid signal transitions.

Applications

• ADC input driver
• Differential amplifiers
• IF/RF amplifiers
• Pulse amplifiers
• DAC current to voltage conversion

Procurement Notes

Verify the specific ordering suffix 'ANZ' corresponds to the PDIP package variant when sourcing replacements or verifying stock. Confirm that the component meets the required industrial temperature range specifications (-40°C to +85°C) for your intended environment. Ensure power supply bypassing requirements are met to optimize high-frequency performance and minimize distortion.

Selection Notes

Select this component for designs requiring high linearity and wide bandwidth in a voltage feedback configuration. It is particularly suitable for driving flash ADCs or high-resolution converters where low harmonic distortion is critical. Consider the 8-lead PDIP package constraints regarding thermal dissipation and board space compared to surface-mount alternatives.

Part Context

The AD9631ANZ belongs to the AD9631/AD9632 family of ultralow distortion, wide bandwidth voltage feedback op amps. While the AD9631 is unity-gain stable, the AD9632 variant is stable at gains of 2 or greater. Both share similar architectural benefits but differ in specified bandwidth and stability characteristics based on their closed-loop gain configurations.

Replacement Considerations

The AD9632ANZ is a related part within the same family but is designed for stable operation at gains of 2 or greater, unlike the unity-gain stable AD9631. Direct substitution requires verifying that the circuit gain meets the stability requirements of the replacement device.

FAQ

What is the recommended feedback resistor value for optimal performance at unity gain?

For the AD9631 operating at a gain of +1, the datasheet specifies that optimum dynamic performance is achieved with a feedback resistor (RF) value of 140 Ω.

How does the AD9631 handle capacitive loads?

The device is designed primarily for non-reactive loads. When driving capacitive loads, it is recommended to add a small series resistance between the output and the load to maintain frequency response stability.