AD9631ARZ-REEL7

Overview

The AD9631ARZ-REEL7 is a wide bandwidth, ultralow distortion voltage feedback operational amplifier manufactured by Analog Devices Inc. It operates with supply voltages ranging from ±3 V to ±5 V and draws a quiescent current of 17 mA. The device features a small-signal bandwidth of 320 MHz and a large-signal bandwidth of 175 MHz at a gain of +1. Key performance metrics include a slew rate of 1300 V/μs, settling time of 16 ns to 0.01% for a 2 V step, and a third-order intercept point of 46 dBm at 25 MHz. Input offset voltage is typically 3 mV, and input bias current is 2 μA.

Feature Summary

• Voltage feedback architecture providing high speed and predictable design characteristics compared to current feedback amplifiers.
• Ultralow harmonic distortion and low noise density suitable for high-fidelity signal processing.
• Fast pulse response with exceptional settling time capabilities for accurate transient reproduction.
• Unity gain stability allowing operation without external compensation components.

Applications

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

Procurement Notes

Verify the specific package type associated with the REEL7 suffix against official documentation before procurement. Confirm that the industrial temperature range meets environmental requirements. Ensure power supply bypassing and layout considerations align with datasheet recommendations to maintain specified performance levels during implementation.

Selection Notes

Select this component when unity gain stability and wide bandwidth are required in a voltage feedback configuration. Consider the AD9632 if a minimum closed-loop gain of +2 is acceptable, as it offers slightly different bandwidth characteristics. Evaluate thermal dissipation limits based on the SOIC package constraints and ambient operating conditions.

Part Context

The AD9631ARZ-REEL7 belongs to the AD9631/AD9632 family of ultralow distortion, wide bandwidth voltage feedback op amps. This series combines attributes of both current and voltage feedback amplifiers, offering fast settling times and high slew rates while maintaining the predictability of classical op amp structures for active filter and driver applications.

Replacement Considerations

The AD9632 is the related dual-gain variant within the same family. Verify pin compatibility and electrical specifications against the AD9632 datasheet if substituting, noting differences in stable gain configurations and bandwidth parameters.

FAQ

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

For the AD9631 at a gain of +1, an RF value of 140 Ω provides the best combination of wide bandwidth, low parasitic peaking, and fast settling time.

How does the AD9631 handle capacitive loads?

To drive capacitive loads effectively, a small series resistance should be added between the output and the load capacitor to maintain frequency response stability.