The LTC1967 is a high precision extended bandwidth, RMS-to-DC converter with 0.02% linearity that allows simple system calibration. The bandwidth is 40kHz, independent of input voltage amplitude and with no additional gain error. It uses a Delta Sigma conversion technology with only one external capacitor for True RMS-DC conversion. It features low supply current and ultralow shutdown current. The input can be either differential or single-ended, with a common mode voltage range from rail to rail and differential voltage up to 1VPEAK. The output can be rail to rail, with a separate output reference pin that allows level shifting. It is available in an 8-pin MSOP package that saves space. It is used in True RMS digital multimeters and panel meters. It is also used in True RMS AC + DC measurements.
The LTC1967 RMS‑to‑DC converter uses delta‑sigma conversion to provide true RMS measurements with a single external capacitor. It operates from a single 4.5 V to 5.5 V supply and offers rail‑to‑rail input and output ranges, making it suitable for portable and low‑power applications.
Key features include 0.02 % linearity error, 40 kHz bandwidth independent of input amplitude, ultra‑low shutdown current of 0.1 mA, and flexible differential or single‑ended inputs. The device is supplied in an 8‑lead MSOP package and is designed for use in true‑RMS digital multimeters, panel meters, and other measurement equipment.