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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

? < 2.5?A Low-Current Power-Down Mode for Efficient Power Cycling

? 250?s 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