Analog Circuit Design Volume Three

Chapter 488

An autoranging true RMS converter

Philip Karantzalis and Jim Mahoney

Abstract

An autoranging true RMS-to-DC converter is described.

Keywords

RMS-to-DC converter

autoranging

LTC1966

Introduction

The LTC1966 is a true RMS to DC converter that uses a $\mathrm{\Delta }\sum$ computational technique to make it dramatically simpler to use, significantly more accurate, lower in power consumption and more flexible than conventional log-antilog RMS to DC converters. The LTC1966 RMS to DC converter has an input signal range from 5mV_RMS to 1.5V_RMS (a 50dB dynamic range with a single 5V supply rail) and a 3dB bandwidth of 800kHz with signal crest factors ...