315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range

Industry's First 300MHz to 450MHz Superheterodyne Receiver with AGC and Integrated Image Rejection Operates from 3V or 5V Supplies

Please check latest availability status for a specific part variant.


The MAX1473 fully integrated low-power CMOS superheterodyne receiver is ideal for receiving amplitude-shift-keyed (ASK) data in the 300MHz to 450MHz frequency range. Its signal range is from -114dBm to 0dBm. With few external components and a low-current power-down mode, it is ideal for cost- and power-sensitive applications typical in the automotive and consumer markets. The chip consists of a low-noise amplifier (LNA), a fully differential image-rejection mixer, an on-chip phase-locked-loop (PLL) with integrated voltage-controlled oscillator (VCO), a 10.7MHz IF limiting amplifier stage with received-signal-strength indicator (RSSI), and analog baseband data-recovery circuitry. The MAX1473 also has a discrete one-step automatic gain control (AGC) that drops the LNA gain by 35dB when the RF input signal is greater than -57dBm.

The MAX1473 is available in 28-pin TSSOP and 32-pin thin QFN packages. Both versions are specified for the extended (-40°C to +85°C) temperature range.
MAX1473: Typical Application Circuit MAX1473: Typical Application Circuit Enlarge+

Key Features

  • Optimized for 315MHz or 433MHz ISM Band
  • Operates from Single 3.3V or 5.0V Supplies
  • High Dynamic Range with On-Chip AGC
  • Selectable Image-Rejection Center Frequency
  • Selectable x64 or x32 fLO/fXTAL Ratio
  • Low 5.2mA Operating Supply Current
  • < 2.5µA Low-Current Power-Down Mode for Efficient Power Cycling
  • 250µs Startup Time
  • Built-In 50dB RF Image Rejection
  • Receive Sensitivity of -114dBm


  • Automotive Remote Keyless Entry (RKE)
  • Garage Door Openers
  • Home Automation
  • Local Telemetry Systems
  • Remote Controls
  • Security Systems
  • Wireless Sensors

See parametric specs for ISM RF Receivers < 1GHz (7)

Part NumberBand/ Freq.
IF Output Freq.
Modulation ModeRX Sensitivity
Data Rate
maxSee Notes
MAX1473 300 to 45010.7
$1.75 @1k

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.
Product Reliability Reports: MAX1473.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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.

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