100MHz to 2500MHz, 45dB RF Detector in a UCSP

Industry's Smallest Quad-Band, 2.5GHz, 45dB RF Power Amplifier Detector Saves 80% Board Space

Please check latest availability status for a specific part variant.


The MAX4003 low-cost, low-power logarithmic amplifier is designed to detect the power levels of RF power amplifiers (PAs) operating from 100MHz to 2500MHz. A typical dynamic range of 45dB makes this logarithmic amplifier useful in a variety of wireless applications including cellular handset PA control, TSSI for wireless terminal devices, and other transmitter power measurements. This logarithmic amplifier provides much wider measurement range and superior accuracy than typical diode-based detectors. Excellent temperature stability is achieved over the full operating range of -40°C to +85°C.

The MAX4003 logarithmic amplifier is a voltage-measuring device with a typical signal range of -58dBV to -13dBV. The input signal is internally AC-coupled by an on-chip 5pF capacitor in series with a 2kΩ resistance. This highpass coupling, with a corner at 16MHz, sets the lowest operating frequency and allows the input signal source to be DC grounded. The MAX4003 also features a power-on delay, which holds the detector output (OUT) low for approximately 5µs to ensure glitchless controller output.

The MAX4003 is available in an 8-bump chip-scale package (UCSP™), an 8-pin µMAX® package, and an 8-pin thin QFN package. The device consumes 5.9mA with a 3.0V supply and only 13µA when the device is in shutdown.
MAX4003: Typical Application Circuit MAX4003: Typical Application Circuit Enlarge+

Key Features

  • Complete RF Detector
  • Frequency Range from 100MHz to 2500MHz
  • Input Range of -58dBV to -13dBV (-45dBm to 0dBm into 50Ω )
  • Fast Response: 70ns in 10dB Steps
  • Low-Current Consumption: 5.9mA at VCC = 3.0V
  • 13µA (typ) Shutdown Current
  • Available in 8-Bump UCSP or 8-Pin µMAX and Thin QFN Packages


  • Cellular Handsets (TDMA, CDMA, GPRS, GSM)
  • RSSI for Fiber Modules
  • Transmitter Power Measurement and Control
  • TSSI for Wireless Terminal Devices
Part NumberDetector TypeDynamic Range
RF Freq.
RF Freq.
(mm x mm)
Oper. Temp.
minmax50Ω TermSee Notes
MAX4003 Log. Amp.452.7 to 5.55.91002500-45 to 0
1.5 x 1.5
3.0 x 3.0
3.0 x 3.5
-40 to +85
UCSP (B)/9
$1.15 @1k
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.

MAX4003EVKIT: Evaluation Kit for the MAX4003

Technical Documents

App Note 3611 Integrated DC Logarithmic Amplifiers

Quality and Environmental Data

Product Reliability Reports: MAX4003.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • MAX4003 S-Parameter File
  • CAD Symbols and Footprints

  • MAX4003EBL+
  • MAX4003EBL+T
  • MAX4003EBL-T
  • MAX4003ETA+
  • MAX4003ETA+T
  • MAX4003ETA-T
  • MAX4003EUA
  • MAX4003EUA+
  • MAX4003EUA+T
  • MAX4003EUA-C1D
  • MAX4003EUA-T
  • MAX4003EUA/GH9
  • MAX4003EUA/GH9-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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    Type ID PDF Title
    App Note 3611 Integrated DC Logarithmic Amplifiers