LTC1967 - Precision Extended Bandwidth, RMS-to-DC Converter

The LTC1967 is a true RMS-to-DC converter that uses an innovative delta-sigma computational technique. The benefits of the LTC1967 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 LTC1967 operates with 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. The LTC1967 allows hassle-free system calibration at any input voltage.

The LTC1967 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 LTC1967 is packaged in the space-saving MSOP package, which is ideal for portable applications.

Protected under U.S. Patent Numbers 6,359,576, 6,362,677 and 6,516,291

  • High Linearity: 0.02% Linearity Allows Simple System Calibration
  • Wide Input Bandwidth: Bandwidth to 0.1% Additional Gain Error: 40kHz Bandwidth Independent of Input Voltage Amplitude
  • No-Hassle Simplicity: True RMS-DC Conversion with Only One External Capacitor Delta Sigma Conversion Technology
  • Low Supply Current: 330µA Typ
  • 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
Typical Application
LTC1967 Typical Application
LTC1967 Typical Application
  • True RMS Digital Multimeters and Panel Meters
  • True RMS AC + DC Measurements
LTC1967 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
Demo Boards
Part NumberDescriptionPrice
DC427B-BLTC1967CMS8 | RMS to DC Converter$50.00
Application Note
Design Note
Reliability Data
LT Journal
Press Release
CAD Symbol
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LTC1967/LTC1968 - Product Press Release
LTC1967 Footprints and Symbols