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)

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

Dual RF Power Amplifier Linearizer (RFPAL)

  • Ease of Use
  • Smaller Total System Form Factor (24mm x 26mm)
  • Reduces System Power Consumption and OPEX

16-Bit, 5.9Gsps Interpolating and Modulating RF DAC with JESD204B Interface

  • Simplifies RF Design and Enables New Communication Architectures
  • Direct RF Synthesis of 600MHz Bandwidth Up to 2.8GHz
  • Highly Flexible and Configurable