AD654JN

Overview

The AD654JN is a monolithic voltage-to-frequency converter from Analog Devices Inc. It operates on single or dual supplies ranging from 5 V to 36 V, with an operating range up to 65 V. The device features a full-scale frequency capability of 500 kHz and a quiescent current of 2.0 mA. Linearity error is specified at 0.1% for 250 kHz and 0.4% for 500 kHz full-scale frequencies. It includes a high-impedance input amplifier with 1 mV offset voltage and 250 MΩ input resistance. The output is an open-collector square wave capable of sinking over 10 mA.

Feature Summary

• Monolithic integration of input amplifier, precision oscillator, and high-current output stage
• Versatile input amplifier supporting positive, negative voltage, and negative current modes
• Open-collector output stage allowing direct interface to various logic families
• Minimal external component requirement using a single RC timing network

Applications

• Analog-to-digital conversion systems
• Isolated signal transmission via optocouplers
• Frequency-to-voltage conversion circuits
• Phase-locked loop implementations
• Tuning switched-capacitor filters

Procurement Notes

Verify the specific suffix JN corresponds to the PDIP-8 package configuration required for your design. Confirm that the supply voltage limits and temperature ranges align with your operational environment specifications before finalizing procurement decisions.

Selection Notes

Select this component when low cost and minimal external parts are prioritized. Ensure the application requires a square-wave output rather than a pulse train. Verify that the input signal range fits within the specified single or dual supply constraints and that the 500 kHz maximum frequency meets system bandwidth requirements.

Part Context

The AD654 belongs to the AD654 series of voltage-to-frequency converters manufactured by Analog Devices. It is designed as a low-cost solution for applications requiring precise frequency generation based on analog input signals. The JN suffix indicates the plastic DIP-8 package variant suitable for through-hole mounting.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.