AD537KD

Overview

The AD537KD is a monolithic voltage-to-frequency and frequency-to-voltage converter manufactured by Analog Devices Inc. It features a high-impedance input amplifier, a precision internal reference generator, and an open-collector output stage capable of driving up to 20 mA. The device operates on a single supply ranging from 4.5 V to 36 V or dual supplies of ±5 V to ±18 V, with a quiescent current of 1.2 mA. It provides a full-scale frequency range up to 150 kHz and includes a 1.00 V reference output and a temperature-proportional output of 1.00 mV/K. The component is housed in a 14-lead ceramic DIP package.

Feature Summary

• Integrates a high-impedance input amplifier for direct connection to small signals without loading effects.
• Provides a precise 1.00 V reference output and a linear absolute temperature output of 1.00 mV/K.
• Features an open-collector output stage capable of sinking up to 20 mA at low saturation voltage.
• Supports both voltage-to-frequency and frequency-to-voltage conversion modes.

Applications

• Voltage-to-frequency data transmission systems
• Frequency-to-voltage conversion within phase-locked loops
• Absolute temperature-to-frequency converters
• Thermocouple interface circuits

Procurement Notes

Verify the specific suffix 'KD' against the manufacturer's official documentation to confirm the package type and performance grade. Confirm availability status as distribution channels may list this part as discontinued or limited stock. Ensure the required operating temperature range aligns with the commercial specifications defined for this variant.

Selection Notes

Select the AD537KD when a high linearity voltage-to-frequency conversion is required with minimal external components. Consider this part for applications needing a built-in temperature sensor output or a stable 1.00 V reference. Evaluate the 14-lead ceramic DIP package constraints against board layout requirements and thermal management needs.

Part Context

The AD537 series consists of complete voltage-to-frequency converters designed for high accuracy and versatility. The AD537KD specifically denotes the version packaged in a 14-lead ceramic dual in-line package (DIP). This packaging option supports standard through-hole mounting techniques while providing robust physical protection for the integrated circuit die.

Replacement Considerations

Consult the Analog Devices military products databook for specifications regarding the AD537/883B variant if hermetic sealing is required. Verify compatibility with existing timing capacitors and scaling resistors when substituting other members of the AD537 family.