315MHz/434MHz Low-Power, 3V/5V ASK/FSK Superheterodyne Receiver

300MHz to 450MHz Superheterodyne ASK/FSK Receiver with Integrated Image Rejection Operates from 3V or 5V Supply


The MAX1471 low-power, CMOS, superheterodyne, RF dual-channel receiver is designed to receive both amplitude-shift-keyed (ASK) and frequency-shift-keyed (FSK) data without reconfiguring the device or introducing any time delay normally associated with changing modulation schemes. The MAX1471 requires few external components to realize a complete wireless RF digital data receiver for the 300MHz to 450MHz ISM bands.

The MAX1471 includes all the active components required in a superheterodyne receiver including: a low-noise amplifier (LNA), an image-reject (IR) mixer, a fully integrated phase-locked loop (PLL), local oscillator (LO), 10.7MHz IF limiting amplifier with received-signal-strength indicator (RSSI), low-noise FM demodulator, and a 3V voltage regulator. Differential peak-detecting data demodulators are included for both the FSK and ASK analog baseband data recovery. The MAX1471 includes a discontinuous receive (DRX) mode for low-power operation, which is configured through a serial interface bus.

The MAX1471 is available in a 32-pin thin QFN package and is specified over the automotive -40°C to +125°C temperature range.
MAX1471: Typical Application Circuit MAX1471: Typical Application Circuit Enlarge+

Key Features

  • ASK and FSK Demodulated Data on Separate Outputs
  • Specified over Automotive -40°C to +125°C Temperature Range
  • Low Operating Supply Voltage Down to 2.4V
  • On-Chip 3V Regulator for 5V Operation
  • Low Operating Supply Current
    • 7mA Continuous Receive Mode
    • 1.1µA Deep-Sleep Mode
  • Discontinuous Receive (DRX) Low-Power Management
  • Fast-On Startup Feature < 250µs
  • Integrated PLL, VCO, and Loop Filter
  • 45dB Integrated Image Rejection
  • RF Input Sensitivity*
    • ASK: -114dBm
    • FSK: -108dBm
  • Selectable IF BW with External Filter
  • Programmable Through Serial User Interface
  • RSSI Output and High Dynamic Range with AGC
*0.2% BER, 4kbps, Manchester-encoded data, 280kHz IF BW


  • Automotive Remote Keyless Entry (RKE)
  • Garage Door Openers
  • Home Automation
  • Local Telemetry Systems
  • Medical Systems
  • Security Systems
  • Tire-Pressure Monitoring Systems
  • Wireless Keys
  • Wireless Sensors
Part Number IF Output Freq.
Applications Solutions Band/ Freq.
(mm x mm)
Package/Pins Budgetary
See Notes
MAX1471  10.7
2.4 to 3.6
4.5 to 5.5
Garage Door Openers
Remote Controls
Remote Keyless Entry
Security Systems
Wireless Sensors
300MHz to 450MHz
300 to 450 5.0 x 5.0
$2.30 @1k
See All ISM RF Receivers (9)
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.

MAX1471EVKIT-315: Evaluation Kit for the MAX1471
MAX1471EVKIT-433: Evaluation Kit for the MAX1471

Tools & Models

CAD and Layout
MAX1471 Gerber File

MAX1471 EVKit Software

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