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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

Product Details

Key Features

Parametric specs for ISM RF Receivers < 1GHz
Band/ Freq. (MHz) 300 to 450
IF Output Frequency (MHz) 10.7
Modulation Mode ASK
OOK
RX Sensitivity (dBm) -115
Data Rate (kbps) (max) 100
Package/Pins TQFN/32
TSSOP/28
Budgetary
Price (See Notes)
2.37
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Simplified Block Diagram

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Parameters

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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX1473: Typical Application Circuit MAX1473: Typical Application Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .