LT5570 - Fast Responding, 40MHz to 2.7GHz Mean-Squared Power Detector


  • Frequency Range: 40MHz to 2.7GHz
  • Accurate RMS Power Measurement of High Crest Factor Modulated Waveforms
  • Linear DC Output vs Input Power in dBm
  • Linear Dynamic Range: Up to 60dB
  • Exceptional Accuracy over Temperature: ±0.3dB
  • Fast Response Time: 0.5μs Rise Time, 8μs Fall Time
  • Low Supply Current: 26.5mA
  • Low Impedance Output Buffer Capable of Driving High Capacitance Load
  • Small 3mm × 3mm 10-Lead DFN Package

Typical Application

LT5570 Typical Application
LT5570 Typical Application


The LT5570 is a 40MHz to 2.7GHz monolithic Logarithmic Mean-Squared RF power detector. It is capable of RMS measurement of an AC signal with wide dynamic range, from –52dBm to 13dBm depending on frequency. The power of the AC signal in an equivalent decibel-scaled value is precisely converted into DC voltage on a linear scale, independent of the crest factor of the waveforms. The LT5570 is suitable for precision RF power measurement and level control for a wide variety of RF standards, including CDMA, W-CDMA, CDMA2000, TD-SCDMA and WiMAX. The DC output is buffered with a low output impedance amplifier capable of driving a high capacitance load.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

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

Part Number Package Code Temp Package
LT5570IDD#PBF 3x3 DFN-10 DD I 05-08-1699 Yes
LT5570IDD#TRPBF 3x3 DFN-10 DD I 05-08-1699 Yes

LT5570 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

Package Variations and Pricing

Part Number Package Temp Price
LT5570IDD#PBF 3x3 DFN-10 I $8.17 $5.75 Yes
LT5570IDD#TRPBF 3x3 DFN-10 I $5.81 Yes
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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 Linear Technology sales office or authorized distributor.

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.

Part Number Description Price Documentation
DC1077A LT5570IDD | RMS Power Detector for low frequency 40MHz to 875MHz. Contact Factory
DC1078A LT5570IDD | RMS Power Detector for 1.85GHz to 2.7GHz Frequency Range Contact Factory
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Click here to view our complete list of demo boards


  • RMS Power Measurement
  • RF Power Control
  • Receive and Transmit Gain Control
  • RF Instrumentation

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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!

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