AD537SH/883B

Overview

The AD537SH/883B is a monolithic voltage-to-frequency converter (VFC) manufactured by Analog Devices Inc. It integrates an input amplifier, precision oscillator, internal reference generator, and high-current output stage. The device supports single supply operation from 5 V to 36 V with a quiescent current of 1.2 mA. It achieves linearity error as low as ±0.05% for a 10 kHz full-scale frequency and operates over an 80 dB dynamic range. The overall temperature coefficient is typically ±30 ppm/°C. This component is available in a version compliant with MIL-STD-883 standards.

Feature Summary

• Integrates a versatile input amplifier supporting positive or negative voltage modes and negative current mode with high input impedance.
• Provides a 1.00 V thermometer output with a sensitivity of 1 mV/K for integrated temperature sensing applications.
• Requires only a single external RC network to configure full-scale frequency up to 100 kHz and full-scale input voltage up to 30 V.

Applications

• Analog-to-digital conversion using pulse counting or period timing techniques with microprocessors.
• Frequency-to-voltage conversion circuits utilizing the reciprocal functionality of the VFC architecture.
• Precision measurement systems requiring wide dynamic range and low drift characteristics.

Procurement Notes

Verify that the specific suffix /883B confirms compliance with MIL-STD-883 requirements for military or aerospace qualification. Confirm package type and pinout compatibility during integration. Check current availability status as specialized versions may have limited stock or restricted distribution channels through authorized distributors.

Selection Notes

Select this component when a high-precision voltage-to-frequency conversion is required with minimal external components. The integrated 1 mV/K reference output simplifies designs needing simultaneous temperature monitoring. Ensure the operating supply voltage remains within the 5 V to 36 V range and verify that the 1.2 mA quiescent current meets power constraints.

Part Context

The AD537 series serves as a foundational analog signal conditioning component for converting continuous voltage signals into proportional frequency outputs. The SH/883B variant denotes a specific packaging and qualification grade intended for environments requiring adherence to military standards. It belongs to a family of devices designed for simplified design approaches in data acquisition and telemetry systems.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify functional equivalence regarding linearity, dynamic range, and supply voltage specifications if considering alternative VFCs.