General Description
The MAX1473 fully integrated low-power CMOS superheterodyne receiver is ideal for receiving amplitudeshift-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.

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