AD204KY

Instrumentation, Op Amps, Buffer Amps Overview

The AD204KY is a two-port, transformer-coupled isolation amplifier in a SIP package. It provides galvanic isolation for signal and power using an external clock driver. Key parameters include a full-power bandwidth of 5 kHz, adjustable gain from 1 V/V to 100 V/V, and ±0.025% maximum nonlinearity. It offers ±2000 V pk continuous common-mode isolation voltage and consumes 35 mW of power. The device features isolated power outputs of ±7.5 V at 2 mA.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Provides complete galvanic isolation between input and output stages via internal transformer coupling.
• Includes an uncommitted operational amplifier on the input stage for flexible signal conditioning.
• Delivers isolated power outputs suitable for biasing low-drift preamplifiers or strain gauges.
• Operates with low power consumption to support high channel density applications.

Instrumentation, Op Amps, Buffer Amps Applications

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

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify that the component matches the specific K grade for ±0.025% nonlinearity and KY suffix for the 2000 V isolation rating. Confirm compatibility with the required external clock driver, such as the AD246, as the device does not contain an internal DC-DC converter. Ensure proper ESD handling procedures are followed during installation due to device sensitivity.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this model when high accuracy and low power consumption are critical compared to self-powered alternatives. The external clock architecture allows multiple units to share a single driver, reducing system cost in dense arrays. Verify that the application can accommodate the necessary clock signal generation and that the isolated power output meets the load requirements of connected circuitry.

Instrumentation, Op Amps, Buffer Amps Part Context

This component belongs to the AD202/AD204 family of miniature isolation amplifiers designed for general-purpose use where galvanic separation is required. The AD204 variant specifically utilizes an externally supplied clock for power conversion, distinguishing it from the internally powered AD202. This design choice facilitates lower power usage and higher bandwidth performance in multi-channel configurations.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

The AD202KY serves as a functional alternative if an internal power supply is preferred over an external clock driver. Both devices share identical pinouts and electrical characteristics except for the power method. Ensure the replacement solution accounts for the additional board space and component count required for the external clock generator if switching from the AD202 to the AD204.

Instrumentation, Op Amps, Buffer Amps FAQ

How is the AD204KY powered?

The AD204KY is powered by an externally supplied clock signal, typically a 15 V p-p square wave at 25 kHz, rather than a direct DC voltage source.

What is the purpose of the uncommitted input op amp?

The uncommitted input op amp allows users to configure buffering, gain setting, filtering, summing, or transimpedance functions before the signal enters the isolation barrier.

Can the output leads be interchanged?

Yes, the output signal is not internally buffered, allowing the user to interchange the output leads to achieve signal inversion without affecting the isolation function.