The LTC1968 is a precision wide bandwidth RMS-to-DC converter with 0.02% linearity for simple system calibration.
The LTC1968 provides true RMS‑to‑DC conversion using a delta‑sigma architecture. It operates from a single 4.5 V to 5.5 V supply, offers rail‑to‑rail input and output, and requires only one external capacitor for averaging. Its small 8‑pin MSOP package makes it suitable for portable and space‑constrained designs.
Key features include 0.02 % linearity error, a 500 kHz bandwidth at 1 % gain error, differential inputs up to 1 V peak, and a shutdown current of only 0.1 µA. The device is specified for –40 °C to 85 °C operation and includes detailed electrical characteristics, pin descriptions, and design guidelines for various applications such as true‑RMS multimeters and panel meters.
| Supply Voltage | 4.5 V to 5.5 V |
|---|---|
| Shutdown Current | 0.1 µA |
| Maximum Differential Input | 1 V peak |
| Output Type | Rail‑to‑rail |
| Package | 8‑Pin MSOP |
It operates from 4.5 V up to 5.5 V.
The shutdown current is only 0.1 µA.
The device accepts differential inputs up to 1 V peak.
It is supplied in an 8‑pin MSOP package.