The AD637 is a complete, high accuracy, monolithic rms-to-dc converter that computes the true rms value of any complex waveform. It offers performance that is unprecedented in low voltage, wideband applications.
The AD637 RMS‑to‑DC converter provides true RMS, square, mean‑square, absolute‑value and dB outputs over a wide frequency range. It features a chip‑select pin that reduces quiescent current for battery‑powered applications and allows multiple devices to be multiplexed.
Key specifications include 8 MHz bandwidth at 2 Vrms input, selectable input ranges up to 7 Vrms, low standby current of 350 µA, and operation from +3 V to +18 V supply. The device is offered in 14‑lead SBDIP, 14‑lead CERDIP and 16‑lead SOIC_W packages.
| Bandwidth (2 Vrms input) | 8 MHz |
|---|---|
| Quiescent Current (active) | 2.2 mA |
| Rated Temperature Range (J/K grades) | 0 °C to 70 °C |
The AD637 provides up to 8 MHz bandwidth when driven with a 2 Vrms input signal.
By using the chip‑select pin, the quiescent current can be lowered from 2.2 mA to about 350 µA.