This document describes the specifications and features of the AD537 series products, including current-to-frequency converter, analog input amplifier, and reference outputs.
The AD537 is a precision current‑to‑frequency converter that operates from a single supply of 4.5 V to 36 V (or dual supply ±5 V to ±18 V). It provides a frequency output from 0 kHz up to 150 kHz with low non‑linearity and a high‑impedance input stage for voltage‑to‑current conversion. The document includes full specifications, typical application circuits, calibration procedures, and protection guidelines.
Additional sections cover output interfacing to digital logic families, synchronous operation via the SYNC pin, temperature‑to‑frequency conversion, and two‑wire data transmission. Application examples illustrate how the AD537 can be used for voltage‑to‑frequency, temperature‑to‑frequency, and PLL‑based V‑to‑F conversions.
| Frequency Range | 0 kHz to 150 kHz |
|---|---|
| Supply Voltage (Single Supply) | 4.5 V to 36 V |
| Supply Voltage (Dual Supply) | ±5 V to ±18 V |
| Quiescent Current | 1.2 mA (2.5 mA max) |
| Input Bias Current | 100 nA |
| Output Sink Current (Logic 0) | 20 mA min |
| Temperature Range (Rated Performance) | 0°C to +70°C |
The AD537 can generate frequencies from 0 kHz up to 150 kHz.
It operates from a single supply of 4.5 V to 36 V or a dual supply of ±5 V to ±18 V.
The input bias current for either input is 100 nA.