AD652 is a synchronous voltage-to-frequency converter (SVFC) produced by Analog Devices. It has a full-scale frequency range of up to 2MHz, extremely low linearity error (maximum 0.005% at 1MHz FS, 0.02% maximum at 2MHz FS), accurate 5V reference voltage, low drift (maximum 25 ppm/°C), dual- or single-supply operation, voltage or current input, and is compliant with MIL-STD-883.
The AD652 synchronous voltage‑to‑frequency converter (SVFC) provides a precise analog‑to‑digital conversion block. It uses an external clock to set the full‑scale frequency, achieving linearity errors as low as 0.005 % at 1 MHz FS and 0.02 % at 2 MHz FS. The device includes a buffered 5 V reference, low‑drift on‑chip resistors, and requires only a non‑critical integrator capacitor for operation.
The converter is offered in several grades (JP/KP, AQ/BQ, SQ) covering commercial, industrial, and extended temperature ranges. It supports dual‑ or single‑supply operation, voltage or current inputs, and is available in MIL‑STD‑883 compliant versions. Typical applications include precision measurement, multiplexed data acquisition, and isolated analog signal transmission.
| Full‑scale frequency (max) | 2 MHz |
|---|---|
| Gain Error (200 kHz) | Typical +1 % |
| Inverting Input Bias Current | Typical 5 nA |
| Operating Temperature Range (JP/KP grade) | 0 °C to +70 °C |
| Rated Supply Voltage | +15 V |
The device can source up to 50 mA on its open‑collector output.
The clock input supports frequencies up to 4 MHz (typical) or 5 MHz (maximum).
Yes, the AD652 is an ESD‑sensitive device and requires proper handling to avoid damage.
JP/KP grades operate from 0 °C to +70 °C, AQ/BQ grades from –40 °C to +85 °C, and the SQ grade from –55 °C to +125 °C.