ADA4637-1BRZ-RL

Overview

The ADA4637-1BRZ-RL is a single-channel 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 on dual supplies ranging from ±5 V to ±15 V, with a maximum supply voltage of 30 V. Key electrical specifications include a maximum input offset voltage of 200 µV (B Grade), typical offset drift of 1 µV/°C, and maximum input bias current of 5 pA. Voltage noise density is 6.1 nV/√Hz at 1 kHz. It is housed in an 8-lead SOIC package and supports an extended operating temperature range from -40°C to +125°C.

Feature Summary

• Decompensated architecture ensuring stability at noise gains of 5 or greater
• High-speed performance combined with precision DC characteristics
• Very low input bias current suitable for high impedance sources
• Extended industrial temperature rating for harsh environments

Applications

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

Procurement Notes

Verify the B grade designation indicates a tighter offset voltage specification compared to standard grades. Confirm the RL suffix corresponds to tape and reel packaging requirements for automated assembly. Ensure the 8-lead SOIC footprint matches the PCB layout constraints. Validate that the application circuit maintains a minimum noise gain of 5 to prevent instability due to the decompensated design.

Selection Notes

Select this component when both high bandwidth and ultra-low bias current are required simultaneously. The decompensated nature necessitates a closed-loop gain of at least 5; unity gain configurations are unstable. Compare against the ADA4627-1 if lower bandwidth but unity-gain stability is sufficient for the specific application needs.

Part Context

This part belongs to the ADA4627-1/ADA4637-1 family of wide bandwidth precision amplifiers. It serves as the decompensated counterpart to the ADA4627-1, offering higher speed at the cost of requiring higher minimum gains. The series combines the best specifications of precision DC and high-speed AC op amps.

Replacement Considerations

The ADA4627-1 is a related model within the same datasheet but offers different stability characteristics. Verify compatibility regarding minimum gain requirements before substitution.

FAQ

Is the ADA4637-1 stable at unity gain?

No, the ADA4637-1 is a decompensated amplifier and is only stable at a noise gain of 5 or greater.

What is the maximum input offset voltage for the B Grade?

The maximum input offset voltage for the B Grade is 200 µV at 25°C.