Overview

Features and Benefits

  • High Linearity:
    • 0.02% Linearity Allows Simple System Calibration
  • Wide Input Bandwidth:
    • Bandwidth to 1% Additional Gain Error: 500kHz
    • Bandwidth to 0.1% Additional Gain Error: 150kHz
    • 3dB Bandwidth Independent of Input Voltage Amplitude
  • No-Hassle Simplicity:
    • True RMS-DC Conversion with Only One External Capacitor
    • Delta Sigma Conversion Technology
  • Ultralow Shutdown Current:
    • 0.1µA
  • Flexible Inputs:
    • Differential or Single Ended
    • Rail-to-Rail Common Mode Voltage Range
    • Up to 1VPEAK Differential Voltage
  • Flexible Output:
    • Rail-to-Rail Output
    • Separate Output Reference Pin Allows Level Shifting
  • Small Size:
    • Space Saving 8-Pin MSOP Package

Product Details

The LTC1968 is a true RMS-to-DC converter that uses an innovative delta-sigma computational technique. The benefits of the LTC1968 proprietary architecture, when compared to conventional log-antilog RMS-to-DC converters, are higher linearity and accuracy, bandwidth independent of amplitude and improved temperature behavior.

The LTC1968 operates with single-ended or differential input signals and accurately supports crest factors up to 4. Common mode input range is rail-to-rail. Differential input range is 1VPEAK, and offers unprecedented linearity. The LTC1968 allows hassle-free system calibration at any input voltage.

The LTC1968 has a rail-to-rail output with a separate output reference pin providing flexible level shifting; it operates on a single power supply from 4.5V to 5.5V. A low power shutdown mode reduces supply current to 0.1µA.

The LTC1968 is packaged in the space-saving MSOP package, which is ideal for portable applications.

Applications

  • True RMS Digital Multimeters and Panel Meters
  • True RMS AC + DC Measurements

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTspice

Models for the following parts are available in LTspice:

LTC1968

Product Recommendations

LTC1968 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

Discussions

LTC1968 Discussions

Re: HELP IC RMS TO DC
2 week(s) ago in Energy Monitoring and Metering
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.