AD22050N

Overview

The AD22050N is a single-supply difference amplifier designed for amplifying and low-pass filtering small differential voltages from sources with large common-mode voltages. It features a default gain of x20, alterable from x1 to x160 via external resistors. The input common-mode range extends from below ground to 6x(VS – 1 V), supporting supply voltages from +3.0 V to +36 V. The output spans from 20 mV to (VS – 0.2) V. Key specifications include a differential input resistance of 400 kΩ, transient spike protection up to 60 V, and reversed supply protection down to –34 V. Operating temperature ranges from –40°C to +125°C.

Feature Summary

• Single-supply operation with extended common-mode input range exceeding supply voltage
• Integrated preamplifier and output buffer with factory-trimmed baseline gain
• Configurable low-pass filtering capabilities using internal nodes
• Robust protection against transient spikes and reversed polarity

Applications

• Current sensing in motor control systems
• Interface for pressure transducers and position indicators
• Signal conditioning for strain gages and other low-level signal sources

Procurement Notes

Verify the specific package option required for the design, as the AD22050 family includes Plastic DIP (N-8) and Plastic SOIC (SO-8) variants. Ensure the ordering suffix matches the desired form factor, noting that reel quantities for the SOIC version require increments of 2,500 pieces. Confirm the temperature range specification aligns with the application environment requirements before finalizing the purchase order.

Selection Notes

Select the AD22050N when a high-gain difference amplifier is needed to interface sensors with large common-mode voltages to single-supply systems. Consider the fixed 400 kΩ differential input resistance and the need for external components if gain adjustment or specific filter characteristics are required. Evaluate the output drive capability against the load impedance to ensure the output can swing adequately within the supply constraints.

Part Context

The AD22050N belongs to the AD22050 series of single-supply sensor interface amplifiers manufactured by Analog Devices. This series is engineered for applications requiring precise amplification of small differential signals superimposed on large common-mode voltages. The N suffix specifically denotes the Plastic Mini-DIP package variant, distinguishing it from the SOIC package options available within the same functional family.

Replacement Considerations

Direct replacements within the same family include the AD22050R and AD22050R-Reel, which share identical electrical specifications but differ in packaging. Verify pin compatibility and thermal performance when substituting between DIP and SOIC formats.