AT202KN

Overview

The AT202KN is a high voltage isolation amplifier featuring transformer-coupled signal and power isolation. It operates from a single 15V supply, providing ±7.5V isolated power outputs with 400µA total current capacity. The device offers a gain range of 1V/V to 100V/V with a maximum nonlinearity of ±0.01%. Common-mode rejection reaches 130dB at 100V/V gain, supporting continuous isolation voltages of ±2000V peak. Bandwidth extends to 100kHz for gains up to 50V/V, ensuring precise signal transmission without galvanic connections.

Feature Summary

• Provides integrated isolated power outputs eliminating the need for external DC-DC converters
• Utilizes amplitude modulation for transformer coupling down to DC signals
• Includes an uncommitted input operational amplifier for flexible circuit design
• Delivers high common-mode rejection ratios across varying gain settings

Applications

• Multichannel data acquisition systems
• Current shunt measurements
• Motor controls
• Process signal isolation
• High voltage instrumentation amplifiers

Procurement Notes

Verify component authenticity by checking manufacturer markings against official documentation. Confirm package integrity and pin alignment prior to installation. Review the latest datasheet revision for any updates to electrical characteristics or mechanical dimensions. Ensure application conditions remain within specified operating temperature and voltage limits to maintain performance guarantees.

Selection Notes

Select this component when galvanic isolation between input and output stages is required without external power conversion components. The integrated isolated power rails simplify board layout compared to solutions requiring separate isolators. Consider the bandwidth and gain requirements, as performance varies with gain settings. Verify that the input voltage range and isolation voltage ratings meet the specific system safety and signal integrity needs.

Part Context

This device serves as a drop-in replacement for the AD202KN, maintaining compatibility while offering updated specifications. It belongs to the family of general-purpose isolation amplifiers designed for applications demanding high accuracy and reliability. The technology utilizes internal transformers to achieve signal and power transfer, distinguishing it from capacitive or optical isolation methods.

Replacement Considerations

The AT202KN is explicitly documented as an upgraded drop-in replacement for the AD202KN. Designers migrating from the AD202KN should verify pinout compatibility and ensure that the original design margins accommodate the new component's specifications.

FAQ

How does the AT202KN handle DC signal isolation?

The device uses an amplitude modulation technique to permit transformer coupling of signals down to DC, allowing accurate processing of DC inputs.

What is the function of the FB pin?

Pin 38 (FB) provides the isolated op amp output as a feedback signal, enabling the user to configure the uncommitted input amplifier in various modes.

Can the AT202KN operate without an external DC-DC converter?

Yes, the device contains an internal power transformer driven by a 20kHz square wave, providing isolated power directly and eliminating the need for external DC-DC converters.