LT1088 - Wideband RMS-DC Converter Building Block


  • Obsolete - Datasheet For Reference Only.  Contact LTC For Potential Replacement
  • 300MHz 3dB Bandwidth
  • 1% Accuracy DC-50MHz
  • 2% to 100MHz
  • Bandwidth Flat Over Input Voltage Range
  • 50:1 Crest Factor
  • 20:1 Dynamic Range
  • 35V Peak Input
  • Thermally Based Operation
  • Fully Specified Thermal and Electrical Parameters
  • Standard IC Packages
  • Resistive Inputs

Typical Application

LT1088 Typical Application
LT1088 Typical Application


The LT1088 is a thermally based RMS-DC converter building block.  It converts the input waveform to heat.  Usiing external circuitry, the thermal signal is expressed as a DC output voltage.

LTC's proprietary thermal packaging process permits accurate thermal signal processing in a standard IC package.  The thermal method provides far greater bandwidth than RMS converters based on logarithmic computing techniques.  The LT1088's high voltage breakdown allows crest factor measurements of 50:1 and operation over a 20:1 input dynamic range.  Resistive inputs of 50 ohm or 250 ohm accommodate drive from a wide variety of sources.


For complete and up to date package information and drawings, please refer to our packaging page

LT1088 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards


  • Wideband RMS Voltmeters
  • RF Leveling Loops
  • Wideband AGC
  • High Crest Factor Measurements
  • SCR Power Monitoring

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

Technical Support