AD650KN

Overview

The AD650KN is a monolithic voltage-to-frequency and frequency-to-voltage converter manufactured by Analog Devices Inc. It operates with full-scale frequencies up to 1 MHz and features very low nonlinearity, typically 0.002% at 10 kHz and guaranteed less than 0.1% at 1 MHz for the KN grade. The device supports unipolar, bipolar, or differential input configurations and includes an open-collector output compatible with TTL or CMOS logic families. Input offset voltage is trimmable to zero via external components. It is housed in a standard 14-lead plastic DIP package suitable for commercial temperature ranges.

Feature Summary

• Provides high-speed V/F and F/V conversion with guaranteed linearity below 0.1% at maximum frequency.
• Features flexible input configurations supporting unipolar, bipolar, and differential signal formats.
• Includes separate analog and digital ground pins to prevent ground loops and isolate noise.
• Offers user-programmable input range and full-scale frequency using minimal external capacitors and resistors.

Applications

• High-resolution analog-to-digital conversion utilizing the inherent monotonicity of the transfer function.
• Isolated analog signal transmission through optical couplers or transformers.
• Precision stepper motor speed control systems.
• Phase-locked loop circuits requiring stable frequency references.
• Precision tachometer and FM demodulator applications in frequency-to-voltage mode.

Procurement Notes

Verify the specific suffix 'KN' corresponds to the commercial temperature range (0°C to +70°C) and plastic DIP packaging as defined in the official ordering guide. Confirm that the required linearity specifications align with the KN grade guarantees at your target operating frequency. Ensure supply voltages remain within the rated performance limits of ±9V to ±18V for optimal accuracy. Check for any recent product change notices regarding manufacturing sites or material compliance updates.

Selection Notes

Select this component when high linearity and wide dynamic range are critical for signal conditioning tasks. The AD650KN is appropriate for designs requiring isolation between analog and digital domains due to its separate ground architecture. Consider the external component requirements for timing capacitors and input resistors to set the desired full-scale frequency. Evaluate the need for offset trimming capabilities if precise zero-input calibration is necessary for the application.

Part Context

The AD650 series represents a family of precision converters designed for applications demanding high resolution and wide bandwidth. The KN variant specifically targets commercial environments with a specified operating temperature range of 0°C to +70°C. It is part of a broader lineup that includes industrial and extended temperature grades, offering flexibility for various environmental conditions while maintaining consistent core performance characteristics across the family.

Replacement Considerations

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