ADA4000-2ARMZ

Overview

The ADA4000-2ARMZ is a dual-channel, low-cost, precision JFET input operational amplifier manufactured by Analog Devices Inc. It operates within a supply voltage range of ±4 V to ±18 V and features a high slew rate of 20 V/µs with a gain bandwidth product of 5 MHz. The device exhibits low offset voltage (maximum 1.70 mV), low bias current (maximum 40 pA), and low voltage noise density (16 nV/√Hz). It is unity gain stable and supports an operating temperature range from -40°C to +125°C in an 8-lead MSOP package.

Feature Summary

• JFET input structure providing high input impedance and very low bias current for precision signal conditioning.
• Input common-mode voltage includes the positive power supply rail, enabling high-side signal processing capabilities.
• Fast settling time and high slew rate facilitate rapid response in data acquisition and buffering applications.

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 'RMZ' corresponds to the 8-lead Mini Small Outline Package (MSOP) as specified in the manufacturer's ordering guide. Confirm RoHS compliance status indicated by the 'Z' suffix. Ensure the selected variant matches the required thermal resistance characteristics for the specific PCB layout and ambient operating conditions.

Selection Notes

Select this component when high input impedance and low bias current are critical for maintaining signal integrity in precision measurement systems. The inclusion of the positive supply rail in the common-mode input range makes it suitable for single-supply or asymmetric dual-supply configurations requiring high-side sensing without level shifting.

Part Context

This device belongs to the ADA4000 series of low-cost, precision JFET input operational amplifiers, which also includes single-channel (ADA4000-1) and quad-channel (ADA4000-4) variants. The series is designed to offer a balance of precision performance and power efficiency, utilizing JFET technology to achieve low noise and high input impedance across various industrial and instrumentation applications.

Replacement Considerations

Direct pin-compatible replacements within the same family include the ADA4000-2ARZ (SOIC package) and ADA4000-2ARMZ-RL (tape and reel packaging). Verify package dimensions and thermal properties when substituting between SOIC and MSOP form factors.

FAQ

Does the input common-mode voltage range extend to the positive supply rail?

Yes, the input common-mode voltage includes the positive power supply (+VS), allowing the amplifier to function effectively in high-side signal conditioning applications.

Is the ADA4000-2ARMZ stable at unity gain?

Yes, the device is unity gain stable in both inverting and non-inverting configurations.