ADA4000-1AUJZ-R7

Overview

The ADA4000-1AUJZ-R7 is a single-channel, low-cost, precision JFET input operational amplifier manufactured by Analog Devices Inc. It features a high slew rate of 20 V/μs, a gain bandwidth product of 5 MHz, and a maximum offset voltage of 1.70 mV. The device operates on supply voltages ranging from ±4 V to ±18 V with a typical supply current of 1.65 mA per amplifier. It exhibits a maximum input bias current of 40 pA and a voltage noise density of 16 nV/√Hz at 1 kHz. The component is unity-gain stable and housed in a 5-lead TSOT (UJ-5) surface-mount package.

Feature Summary

• Features a JFET input stage providing high input impedance and very low input bias current for precision signal conditioning.
• Includes the positive power supply rail within the common-mode voltage range, enabling effective high-side signal processing.
• Delivers fast transient response characteristics through a high slew rate and rapid settling time suitable for data acquisition systems.

Applications

• Driving analog-to-digital converter inputs
• Buffering digital-to-analog converter outputs
• High-side signal conditioning circuits
• Instrumentation-quality photodiode amplification

Procurement Notes

Verify that the ordering suffix -R7 corresponds to the specific reel packaging configuration required for automated assembly processes. Confirm the UJ-5 package outline dimensions match the target PCB footprint design. Ensure the RoHS compliant status indicated by the Z suffix aligns with environmental manufacturing standards. Cross-reference the thermal resistance specifications against the expected operating temperature range of -40°C to +125°C.

Selection Notes

Select this component when circuit requirements demand a balance between low cost and high-speed performance. The wide common-mode input range including the positive rail makes it suitable for applications where signals approach the supply voltage. Consider the low bias current for interfacing with high-impedance sensors or capacitive sources without significant loading effects.

Part Context

This device belongs to the ADA4000 series of precision JFET input operational amplifiers, which also includes dual-channel and quad-channel variants. The series utilizes Analog Devices' iPolar channel isolation process technology. The single-channel architecture allows for flexible deployment in space-constrained designs while maintaining the family's core specifications regarding speed and precision.

Replacement Considerations

Direct functional substitutes within the same series include the ADA4000-2ARZ for dual-channel integration or the ADA4000-4ARZ for four-channel consolidation. Verify pin compatibility if replacing with other packages such as SOIC or MSOP versions, as physical footprints differ significantly despite identical electrical characteristics.

FAQ

Does the ADA4000-1 exhibit output phase reversal?

Yes, phase reversal can occur if the input voltage exceeds the maximum common-mode voltage limit. This behavior is temporary and resolves once the common-mode voltage returns to the valid range.

What is the maximum capacitive load the device can drive?

The amplifier is capable of driving up to 1000 pF of capacitive loads without oscillation in unity gain configurations, though snubber networks may be required to minimize overshoot and ringing.