AD537 is an integrated circuit voltage to frequency converter produced by AD company. This product has the characteristics of high precision, high reliability, low power consumption and so on. It can be applied to temperature detection and other scenarios.
The AD537 integrates an input amplifier, precision oscillator, band‑gap reference and high‑current output stage in a single IC. It operates from a single 4.5 V to 36 V supply, draws only 1.2 mA quiescent current, and offers a full‑scale frequency up to 150 kHz. The device provides a 1 V reference and a 1 mV/K temperature‑proportional output, making it suitable for voltage‑to‑frequency and temperature‑to‑frequency conversion.
Typical applications include frequency generation from analog inputs, temperature sensing, and use as a voltage‑controlled oscillator in phase‑locked loops. The open‑collector output can sink up to 20 mA and drive TTL loads, LEDs, or long cables. The AD537 is available in hermetically sealed DIP or metal‑can packages and in three temperature grades (J, K, S).
| Supply voltage (single supply) | 4.5 V to 36 V |
|---|---|
| Quiescent current | 1.2 mA (2.5 mA max) |
| Input resistance (non‑inverting) | 250 MΩ |
| Input bias current | 100 nA |
| Full‑scale frequency range | 0 kHz to 150 kHz |
| Linearity | +0.05 % FS |
| Output low‑voltage (logic 0) | 0.4 V max |
| Reference voltage | 1.00 V ±5 % |
| Temperature reference output | 1.00 mV/K |
The AD537 operates from a single supply of 4.5 V to 36 V.
It consumes 1.2 mA quiescent current (up to 2.5 mA max).
It provides a thermometer output of 1 mV per kelvin.