RF Power Detector

Industry's Smallest Power-Detection Circuit


The MAX2209 is a wideband (800MHz to 2GHz) RF power detector. It takes an RF signal from the directional coupler at the input, and outputs a DC voltage proportional to the RF peak voltage. The change in output voltage versus temperature is very repeatable from part to part and enables a lookup table based on nominal behavior, minimizing the effective detection error to less than ±0.5dB relative to room temperature.

The MAX2209 comes in a space-saving 2 x 2, 0.5mm pitch wafer-level package (WLP) and requires only two external components.
MAX2209: Pin Configuration/Functional Diagram/Typical Operating Circuit MAX2209: Pin Configuration/Functional Diagram/Typical Operating Circuit Enlarge+

Key Features

  • -25dBm to 0dBm Power Detection Range
  • ±0.5dB Detection Error Due to Temperature
  • +2.7V to +5V Single-Supply Operation
  • Space-Saving 4-Bump, 1mm² UCSP™ Package
  • On-Chip 50Ω Termination and DC-Blocking Capacitor


  • Dual-Band WCDMA Handsets
  • High-Speed Downlink Packet Access (HSDPA)
  • High-Speed Uplink Packet Access (HSUPA)
Part Number Detector Type Dynamic Range
RF Freq.
RF Freq.
(mm x mm)
Oper. Temp.
Package/Pins Budgetary
min max 50Ω Term See Notes
MAX2209  Peak 25 2.7 to 5.0 3.5 800 2000 -25 to 0 1.0 x 1.0 -40 to +85
$0.47 @1k
See All RF Power Detectors (17)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX2209EVKIT: Evaluation Kit for the MAX2209

Technical Documents

Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs

Quality and Environmental Data

Product Reliability Reports: MAX2209.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX2209

Related Resources

L-Band Tuner with Programmable Baseband Filter

  • Monolithic Receiver Saves Cost and Space
  • Low Power Reduces Cost
  • High Dynamic Range Eliminates Need for External LNA and/or Attenuators