ADA4637-1BRZ-R7

Overview

The ADA4637-1BRZ-R7 is a single-channel JFET operational amplifier from Analog Devices, designed for high-speed precision applications. It features a gain bandwidth product of 79 MHz and a slew rate of 170 V/µs. The device operates on dual supplies ranging from ±5 V to ±15 V with a supply current of approximately 7 mA per amplifier. Key electrical characteristics include a maximum input offset voltage of 200 µV, typical drift of 1 µV/°C, and very low input bias current of 5 pA maximum. Voltage noise density is 6.1 nV/√Hz at 1 kHz, with peak-to-peak noise of 0.86 µV in the 0.1 Hz to 10 Hz band. It offers high open-loop gain (120 dB typical), CMRR (116 dB typical), and PSRR (112 dB typical). The component is available in an 8-lead SOIC package and supports an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• Decompensated architecture ensuring stability at noise gains of 5 or greater
• JFET input stage providing extremely low input bias current and leakage
• High slew rate and wide bandwidth suitable for fast signal processing
• Low voltage noise density and minimal offset drift over temperature

Applications

• Photodiode amplifiers
• Precision instrumentation systems
• Phase-locked loop filters
• High-end professional audio equipment
• DAC output amplifiers

Procurement Notes

Verify the specific suffix 'R7' indicates reel packaging when sourcing. Confirm the 'B' grade designation matches required offset voltage tolerances against the datasheet specifications. Ensure the ordering code corresponds to the 8-lead SOIC package variant. Check for any recent lifecycle notices regarding availability status.

Selection Notes

Select this part when a decompensated op amp is required for higher speed than unity-gain stable counterparts. Ensure the application circuit maintains a minimum noise gain of 5 to prevent instability. Consider the 8-lead SOIC package constraints for thermal management and PCB layout space relative to LFCSP options.

Part Context

This component belongs to the ADA4627-1/ADA4637-1 family of wide bandwidth precision amplifiers. The ADA4637-1 serves as the decompensated version of the ADA4627-1, offering superior dynamic performance at higher closed-loop gains. Both devices combine precision DC characteristics with high-speed AC capabilities within the same package footprint.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source documentation.