AD626AN

Instrumentation, Op Amps, Buffer Amps Overview

The AD626AN is a low-cost, true single-supply differential amplifier designed for amplifying and low-pass filtering small differential voltages from sources with large common-mode voltages. It operates from a single supply of +2.4 V to +10 V or dual supplies of ±1.2 V to ±6 V. The device features pin-selectable gains of 10 and 100, with an input common-mode range extending to 6(VS – 1 V). Key electrical specifications include a typical common-mode rejection ratio (CMRR) of 90 dB, a maximum input offset voltage of 500 µV, and a -3 dB bandwidth of 100 kHz. It includes built-in RFI filters and allows for continuous overload up to 50 V.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Pin-selectable gain configuration allowing selection between fixed gains of 10 and 100 via analog ground connection.
• True single-supply operation capability enabling use in systems with limited power rails.
• Integrated low-pass filtering functionality accessible through a dedicated filter pin.
• High input protection against continuous overloads up to 50 V.

Instrumentation, Op Amps, Buffer Amps Applications

• Current sensing interfaces
• Pressure transducer signal conditioning
• Strain gauge interface circuits

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix AN corresponds to the 8-lead plastic mini-DIP package when ordering. Confirm the temperature grade matches the required industrial range of -40°C to +85°C. Ensure the design accounts for the 200 kΩ series resistive inputs which require low source resistance to minimize gain error. Check for any obsolete status updates as distribution availability may vary.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when high common-mode voltage rejection is required alongside low power consumption. It is suitable for applications needing simple gain adjustment without external precision resistors. Consider the 100 kHz bandwidth limit for signal frequency requirements. Verify that the output swing capabilities meet the load requirements for both single and dual supply configurations.

Instrumentation, Op Amps, Buffer Amps Part Context

The AD626 belongs to Analog Devices' family of low-cost differential amplifiers. It integrates a precision balanced attenuator and a low-drift preamplifier to handle large common-mode signals. The AD626AN variant specifically denotes the plastic DIP packaging option within the broader AD626 product line, which also includes SOIC packages.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Direct substitutes include other AD626 variants such as AD626AR for surface mount applications. Cross-referencing with similar single-supply differential amplifiers from other manufacturers requires careful verification of CMRR and input common-mode range specifications.

Instrumentation, Op Amps, Buffer Amps FAQ

How is the gain of the AD626 adjusted?

The gain is set by connecting Pin 7 to analog ground for a gain of 100, or leaving it unconnected for a gain of 10. Intermediate gains between 10 and 100 can be achieved using an external resistor network.

What is the purpose of the filter pin on the AD626?

Connecting a capacitor between the filter pin (Pin 4) and ground creates a single-pole low-pass filter, allowing for signal filtering directly within the amplifier circuit.