LT5581 - 6GHz RMS Power Detector with 40dB Dynamic Range

Features

  • Frequency Range: 10MHz to 6GHz
  • Accurate Power Measurement of High Crest Factor (Up to 12dB) Waveforms
  • 40dB Log Linear Dynamic Range
  • Exceptional Accuracy Over Temperature
  • Fast Response Time: 1μs Rise, 8μs Fall
  • Low Power: 1.4mA at 3.3V
  • Log-Linear DC Output vs Input RF Power in dBm
  • Small 3mm × 2mm 8-Pin DFN Package
  • Single-Ended RF Input

Typical Application

LT5581 Typical Application
LT5581 Typical Application

Description

The LT5581 is a 10MHz to 6GHz, low power monolithic precision RMS power detector. The RMS detector uses a proprietary technique to accurately measure the RF power from –34dBm to +6dBm (at 2.14GHz) of modulated signals with a crest factor as high as 12dB. It outputs a DC voltage in linear scale proportional to an RF input signal power in dBm. The LT5581 is suitable for precision power measurement and control for a wide variety of RF standards, including GSM/EDGE, CDMA, CDMA2000, W-CDMA, TD-SCDMA, UMTS, LTE and WiMAX, etc. The final DC output is connected in series with an on-chip 300Ω resistor, which enables further filtering of the output modulation ripple with just a single off-chip capacitor.

Packaging

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

DFN-8

LT5581 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT5581IDDB#PBF DFN 8 I $3.36 View
LT5581IDDB#TRMPBF DFN 8 I $3.36 $2.34 View
LT5581IDDB#TRPBF DFN 8 I $2.29 View
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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
DC1314A LT5581IDDB | 6GHz, 40dB RMS Power Detector Demo Board - optimized for 10MHz to 2.2GHz $100.00
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Click here to view our complete list of demo boards

Applications

  • GSM/EDGE, CMDA, CDMA2000, W-CDMA, LTE,
    WiMAX RF Power Control
  • Pico-Cells, Femto-Cells RF Power Control
  • Wireless Repeaters
  • CATV/DVB Transmitters
  • MIMO Wireless Access Points
  • Portable RMS Power Measurement 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:

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