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  2. Analog Functions
  3. RMS to DC Converters
  4. LTC1966


Features and Benefits

  • Simple to Use, Requires One Capacitor
  • True RMS DC Conversion Using ∆Σ Technology
  • High Accuracy:
    • 0.1% Gain Accuracy from 50Hz to 1kHz
    • 0.25% Total Error from 50Hz to 1kHz
  • High Linearity:
    • 0.02% Linearity Allows Simple System Calibration
  • Low Supply Current:
    • 155μA Typ, 170μA Max
  • Ultralow Shutdown Current:
    • 0.1μA
  • Constant Bandwidth:
    • Independent of Input Voltage
    • 800kHz –3dB, 6kHz ±1%
  • Flexible Supplies:
    • 2.7V to 5.5V Single Supply
    • Up to ±5.5V Dual Supply
  • 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
  • Wide Temperature Range:
    • –55°C to 125°C
  • Small Size:
    • Space Saving 8-Pin MSOP Package

Product Details

The LTC1966 is a true RMS-to-DC converter that utilizes an innovative patented ∆Σ computational technique. The internal delta sigma circuitry of the LTC1966 makes it simpler to use, more accurate, lower power and dramatically more flexible than conventional log antilog RMS-to-DC converters.

The LTC1966 accepts single-ended or differential input signals (for EMI/RFI rejection) and supports crest factors up to 4. Common mode input range is rail-to-rail. Differential input range is 1VPEAK, and offers unprecedented linearity. Unlike previously available RMS-to-DC converters, the superior linearity of the LTC1966 allows hassle free system calibration at any input voltage.

The LTC1966 also has a rail-to-rail output with a separate output reference pin providing flexible level shifting. The LTC1966 operates on a single power supply from 2.7V to 5.5V or dual supplies up to ±5.5V. A low power shutdown mode reduces supply current to 0.5μA.

The LTC1966 is insensitive to PC board soldering and stresses, as well as operating temperature. The LTC1966 is packaged in the space saving MSOP package which is ideal for portable 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® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.


Models for the following parts are available in LTspice:


Product Recommendations

LTC1966 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.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC1966CMS8#PBF Material Declaration Reliability Data 8-Lead MSOP
LTC1966CMS8#TRPBF Material Declaration Reliability Data 8-Lead MSOP
LTC1966HMS8#PBF Material Declaration Reliability Data 8-Lead MSOP
LTC1966HMS8#TRPBF Material Declaration Reliability Data 8-Lead MSOP
LTC1966IMS8#PBF Material Declaration Reliability Data 8-Lead MSOP
LTC1966IMS8#TRPBF Material Declaration Reliability Data 8-Lead MSOP
LTC1966MPMS8#PBF Material Declaration Reliability Data 8-Lead MSOP
LTC1966MPMS8#TRPBF Material Declaration Reliability Data 8-Lead MSOP
Wafer Fabrication Data R448 Reliability Data

PCN-PDN Information

Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

Sample & Buy

Ordering FAQs

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Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.


List Pricing

(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

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.