2MHz to 1.6GHz 45dB RF-Detecting Controllers and RF Detector

2MHz to 1.6GHz, 45dB RF-Detecting Controllers Simplify Control-Loop Design of Power Amplifiers and TIAs

Please check latest availability status for a specific part variant.


The MAX9930–MAX9933 low-cost, low-power logarithmic amplifiers are designed to control RF power amplifiers (PA) and transimpedance amplifiers (TIA), and to detect RF power levels. These devices are designed to operate in the 2MHz to 1.6GHz frequency range. A typical dynamic range of 45dB makes this family of logarithmic amplifiers useful in a variety of wireless and GPON fiber video applications such as transmitter power measurement, and RSSI for terminal devices. Logarithmic amplifiers provide much wider measurement range and superior accuracy to controllers based on diode detectors. Excellent temperature stability is achieved over the full operating range of -40°C to +85°C.

The choice of three different input voltage ranges eliminates the need for external attenuators, thus simplifying PA control-loop design. The logarithmic amplifier is a voltage-measuring device with a typical signal range of -58dBV to -13dBV for the MAX9930/MAX9933, -48dBV to -3dBV for the MAX9931, and -43dBV to +2dBV for the MAX9932.

The MAX9930–MAX9933 require an external coupling capacitor in series with the RF input port. These devices feature a power-on delay when coming out of shutdown, holding OUT low for approximately 2.5µs to ensure glitch-free controller output.

The MAX9930–MAX9933 family is available in an 8-pin µMAX® package. These devices consume 7mA with a 5V supply, and when powered down, the typical shutdown current is 13µA.
MAX9930, MAX9931, MAX9932, MAX9933: Functional Diagram MAX9930, MAX9931, MAX9932, MAX9933: Functional Diagram Enlarge+

Key Features

  • Complete RF-Detecting PA Controllers (MAX9930/MAX9931/MAX9932)
  • Complete RF Detector (MAX9933)
  • Variety of Input Ranges
    • MAX9930/MAX9933: -58dBV to -13dBV
      (-45dBm to 0dBm for 50Ω Termination)
    • MAX9931: -48dBV to -3dBV
      (-35dBm to +10dBm for 50Ω Termination)
    • MAX9932: -43dBV to +2dBV
      (-30dBm to +15dBm for 50Ω Termination)
  • 2MHz to 1.6GHz Frequency Range
  • Temperature Stable Linear-in-dB Response
  • Fast Response: 70ns 10dB Step
  • 10mA Output Sourcing Capability
  • Low Power: 17mW at 3V (typ)
  • 13µA (typ) Shutdown Current
  • Available in a Small 8-Pin µMAX Package


  • RSSI for Fiber Modules, GPON-CATV Triplexors
  • Low-Frequency RF OOK and ASK Applications
  • Transmitter Power Measurement and Control
  • TSI for Wireless Terminal Devices
  • Cellular Handsets (TDMA, CDMA, GPRS, GSM)
Part NumberDetector TypeDynamic Range
RF Freq.
RF Freq.
(mm x mm)
Oper. Temp.
minmax50Ω Term
MAX9930 Log. Amp.452.7 to 5.25721600-45 to 03.0 x 5.0-40 to +85
MAX9931 -35 to +10
MAX9932 -30 to +15
MAX9933 -45 to 0
See All RF Power Detectors (12)
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.

MAX9930EVKIT: Evaluation Kit for the MAX9930

Technical Documents

Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
App Note 4230 Expanding the Functionality of the MAX9930 for CATV Applications

Quality and Environmental Data

Product Reliability Reports: MAX9933.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX9933BGUA+
  • MAX9933BGUA+T
  • MAX9933EUA+
  • MAX9933EUA+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >


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