ADA4000-1ARZ

Overview

The ADA4000-1ARZ is a single-channel, low-cost precision JFET input operational amplifier manufactured by Analog Devices Inc. It features a gain bandwidth product of 5 MHz and a slew rate of 20 V/µs. The device operates on supply voltages ranging from ±4 V to ±18 V with a typical supply current of 1.65 mA per amplifier. Key electrical characteristics include a maximum offset voltage of 1.70 mV, a maximum input bias current of 40 pA, and an input voltage noise density of 16 nV/√Hz at 1 kHz. It is unity gain stable and housed in an 8-Lead SOIC package.

Feature Summary

• JFET input structure providing high input impedance and very low input bias current for precision signal conditioning.
• Wide bandwidth and fast settling time suitable for driving analog-to-digital converter inputs and buffering digital-to-analog outputs.
• Input common-mode voltage range includes the positive power supply rail, enabling effective high-side signal processing.

Applications

• Reference gain and buffer circuits
• Level shifting and signal driving
• Active filters
• Power line monitoring and control systems
• Data acquisition front ends

Procurement Notes

Verify that the ordering suffix 'RZ' confirms RoHS compliance as specified in the manufacturer's documentation. Ensure the selected package option matches the required PCB footprint for the 8-Lead SOIC_N (R-8) configuration. Confirm that the operating temperature range meets the specific environmental requirements of the target application before finalizing procurement.

Selection Notes

Select this component when a single-channel amplifier with JFET inputs is required for applications demanding low bias current and moderate bandwidth. It is appropriate for designs needing unity gain stability and operation across a wide dual-supply voltage range. Consider alternative packages like TSOT or MSOP if space constraints differ from the standard SOIC dimensions provided in the datasheet.

Part Context

This device belongs to the ADA4000 series of low-cost precision amplifiers, which also includes dual-channel (ADA4000-2) and quad-channel (ADA4000-4) variants. All members of the family share identical electrical specifications and pinouts where applicable, allowing for design flexibility regarding channel count without changing the core amplifier technology or performance profile.

Replacement Considerations

Direct functional substitutes within the same family include the ADA4000-1AUJZ for TSOT packaging or the ADA4000-1ARMZ for MSOP packaging. These alternatives maintain identical electrical characteristics while offering different physical form factors for board layout optimization.

FAQ

Does the ADA4000-1 experience 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.