AD652JP

Overview

The AD652JP is a monolithic synchronous voltage-to-frequency converter (SVFC) manufactured by Analog Devices Inc. It operates within a supply range of ±12 V to ±36 V and supports full-scale frequencies up to 2 MHz. The device features a maximum linearity error of ±0.02% at 2 MHz FS and a gain temperature coefficient of ±25 ppm/°C. It utilizes an external clock for timing, requires only one noncritical integrator capacitor, and includes a buffered 5 V reference. The component is housed in a 20-lead PLCC package and is specified for commercial operation between 0°C and +70°C.

Feature Summary

• Synchronous architecture using an external clock to define full-scale frequency, ensuring stability independent of internal capacitor drift.
• High precision with extremely low linearity error and laser-wafer-trimmed initial gain error.
• Integrated buffered 5 V reference voltage with low drift characteristics.
• Flexible input configuration supporting both voltage and current modes with single or dual power supplies.

Applications

• Precision analog-to-digital conversion systems
• Isolated analog signal transmission via frequency-to-voltage configuration
• Single-line multiplexed data acquisition
• Bridge transducer interfaces

Procurement Notes

Verify the specific suffix JP against the manufacturer's current ordering guide to confirm package type and performance grade. Confirm that the required operating temperature range aligns with the commercial specification limits. Check for availability of MIL-STD-883 compliant versions if environmental ruggedness is required. Ensure the external clock source meets the TTL and CMOS compatibility requirements for reliable synchronization.

Selection Notes

Select the AD652JP when high linearity and system-wide clock synchronization are critical. The device simplifies design by requiring only a single external integrator capacitor. Consider the available input ranges and the need for bipolar offset calibration if handling negative or bipolar signals. Verify that the open-collector output stage provides sufficient sinking capability for the intended logic family or optical couplers.

Part Context

The AD652 belongs to a family of synchronous voltage-to-frequency converters designed for precision applications. It employs a charge-balancing technique where reset pulses are gated by an external clock. This approach minimizes gain drift and improves linearity compared to traditional one-shot based converters. The JP grade specifically denotes the commercial temperature variant packaged in a 20-lead PLCC format.

Replacement Considerations

Direct replacements include other grades within the AD652 family such as the AD652KP, which shares the same PLCC package but may differ in linearity specifications. Industrial and extended temperature variants like the AD652AQ, AD652BQ, and AD652SQ offer wider thermal ranges but utilize different CERDIP packaging. Verify pinout compatibility and electrical parameter alignment before substitution.