ADA4637-1ACPZ-R7

Overview

The ADA4637-1ACPZ-R7 is a wide bandwidth precision JFET operational amplifier manufactured by Analog Devices Inc. It features a gain bandwidth product of 79 MHz and a slew rate of 170 V/µs. The device operates from ±5 V to ±15 V dual supplies with a typical supply current of 7.5 mA per amplifier. Key electrical characteristics include a maximum offset voltage of 200 µV, an input bias current of 5 pA maximum, and a voltage noise density of 6.1 nV/√Hz at 1 kHz. It is specified for the extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Decompensated architecture ensuring stability at noise gains of 5 or greater
• JFET input stage providing very low input bias current and leakage
• High open-loop gain and common-mode rejection ratio for precision applications
• Integrated offset adjust pins in SOIC package for calibration

Applications

• High impedance sensors
• Photodiode amplifiers
• Precision instrumentation
• Phase-locked loop filters
• Medical equipment

Procurement Notes

Verify that the specific ordering suffix corresponds to the LFCSP package type and reel packaging configuration required for the design. Confirm the component grade (B Grade or A Grade) matches the offset voltage and drift specifications needed for the application. Ensure the supplier provides valid traceability documentation for the Analog Devices manufacturer part number.

Selection Notes

Select this component when high speed combined with precision DC characteristics is required. The decompensated nature mandates a minimum closed-loop gain of 5; do not use for unity gain configurations. Consider the exposed pad thermal requirements for the LFCSP package and implement proper PCB guarding to minimize leakage currents associated with the JFET inputs.

Part Context

This device belongs to the ADA4627-1/ADA4637-1 family of high-speed, low-noise, low-bias current JFET operational amplifiers. It serves as the decompensated counterpart to the ADA4627-1, offering significantly higher bandwidth and slew rates while maintaining similar precision DC parameters such as low offset voltage and drift.

Replacement Considerations

The ADA4627-1 is a related part within the same family but is unity-gain stable with lower bandwidth. Direct substitution requires verifying that the circuit maintains a noise gain of 5 or greater to prevent oscillation.