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

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.

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
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
Packaging
LT5581 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT5581IDDB#PBF3x2 DFN-8I$3.36
LT5581IDDB#TRMPBF3x2 DFN-8I$3.36$2.34
LT5581IDDB#TRPBF3x2 DFN-8I$2.29
Demo Boards
Part NumberDescriptionPrice
DC1314ALT5581IDDB | 6GHz, 40dB RMS Power Detector Demo Board - optimized for 10MHz to 2.2GHz$100.00
Datasheet
Reliability Data
Press Release
CAD Symbol
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LT5581 Footprints and Symbols