LTC1966

PRODUCTION

Precision Micropower ΔΣ RMS-to-DC Converter

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Overview

  • 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

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.

Applications

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

LTC1966
Precision Micropower ΔΣ RMS-to-DC Converter
Single Supply RMS-to-DC Converter Quantum Leap in Linearity Performance Product Package 1
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Documentation

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Analog to Digital Converters (ADCs) 1
LTC2460 PRODUCTION Ultra-Tiny, 16-Bit ΔΣ ADCs with 10ppm/°C Max Precision Reference
Comparators 1
LTC1540 PRODUCTION Nanopower Comparator with Reference
Matched Resistors & Transistors 1
LT5400 RECOMMENDED FOR NEW DESIGNS Quad Matched Resistor Network
Protection Switches & Controllers 1
LT4320
LT4320-1
Ideal Diode Bridge Controller
Temperature Sensors 1
LTC2997 PRODUCTION Remote/Internal Temperature Sensor
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Tools & Simulations

LTspice 1


Models for the following parts are available in LTspice:

  • LTC1966
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.


Evaluation Kits

eval board
DC427B-A

LTC1966CMS8 | RMS to DC Converter

Product Details

DC427B-A: Demo Board for the LTC1966 Precision Micropower, Delta Sigma RMS-to-DC Converter.


 


DC427B-A
LTC1966CMS8 | RMS to DC Converter
DC427B-A Demo Board DC427B-A Demo Board DC427B-A Demo Board DC427B-A Demo Board DC427B-A - Schematic

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