ADA4627-1ARZ

Overview

The ADA4627-1ARZ is a high-speed, low-noise JFET operational amplifier manufactured by Analog Devices Inc. It features a gain bandwidth product of 19 MHz and a slew rate of 82 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, 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 provides high open-loop gain (120 dB typical), CMRR (116 dB typical), and PSRR (112 dB typical). The component is housed in an 8-lead SOIC package and supports an extended operating temperature range from -40°C to +125°C.

Feature Summary

• Combines precision DC characteristics with high-speed AC performance for wide bandwidth applications.
• Features very low input bias current and low offset voltage drift suitable for sensitive measurements.
• Designed to prevent output phase reversal when inputs exceed the common-mode voltage range.
• Includes offset adjust pins in the SOIC package for compatibility with existing designs.

Applications

• High impedance sensors
• Photodiode amplifiers
• Precision instrumentation
• Phase-locked loop filters
• DAC output amplifiers

Procurement Notes

Verify the specific grade (B or A) required for your application, as offset voltage and drift specifications differ between grades. Confirm that the 8-lead SOIC package aligns with your PCB footprint requirements. Ensure the design maintains a noise gain of 1 for stability, as this is the unity-gain stable variant within the series. Check for updated datasheet revisions to confirm current manufacturing status and any potential parameter changes.

Selection Notes

Select the ADA4627-1ARZ when both high speed and low noise are critical, distinguishing it from the decompensated ADA4637-1 which requires a minimum noise gain of 5. Consider the B grade for tighter offset voltage limits if higher precision is needed compared to the A grade. Evaluate the thermal resistance of the SOIC package against your heat dissipation needs. Ensure the input signals remain within the specified common-mode voltage range to avoid phase reversal issues.

Part Context

The ADA4627-1 is part of a family of high-speed precision op amps offered by Analog Devices, designed to bridge the gap between traditional precision amplifiers and high-speed devices. It shares architectural similarities with the ADA4637-1 but is optimized for unity-gain stability. This positioning makes it suitable for applications requiring fast settling times without sacrificing DC accuracy, fitting into the broader portfolio alongside other single-supply and dual-supply precision amplifier families.

Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.

FAQ

Is the ADA4627-1ARZ stable at a noise gain of 1?

Yes, the ADA4627-1 is a unity-gain stable amplifier, unlike the decompensated ADA4637-1 which requires a minimum noise gain of 5.

What is the purpose of the offset adjust pins on the SOIC package?

The offset adjust pins allow for external nulling of the input offset voltage using a potentiometer, providing compatibility with some existing designs, though it is generally not recommended due to increased drift.

Does the ADA4627-1 exhibit output phase reversal?

No, the ADA4627-1 is designed to prevent output phase reversal even if the input common-mode voltage exceeds the power supply rails slightly.