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General Description

The MAX1470 is a fully integrated low-power CMOS superheterodyne receiver for use with amplitude-shift keyed (ASK) data in the 315MHz band. With few required external components, and a low-current power-down mode, it is ideal for cost- and power-sensitive applications in the automotive and consumer markets. The chip consists of a 315MHz low-noise amplifier (LNA), an image rejection mixer, a fully integrated 315MHz phase-lock-loop (PLL), a 10.7MHz IF limiting amplifier stage with received-signal-strength indicator (RSSI) and an ASK demodulator, and analog baseband data-recovery circuitry.

The MAX1470 is available in a 28-pin TSSOP package.

Features

? Operates from a Single +3.0V to +3.6V Supply

? Built-In 53dB RF Image Rejection

? -115dBm Receive Sensitivity*

? 250μs Startup Time

? Low 5.5mA Operating Supply Current

? 1.25μA Low-Current Power-Down Mode for Efficient Power Cycling

? 250MHz to 500MHz Operating Band (Image Rejection Optimized at 315MHz)

? Integrated PLL with On-Board Voltage-Controlled Oscillator (VCO) and Loop Filter

? Selectable IF Bandwidth Through External Filter

? Complete Receive System from RF to Digital Data Out

Applications

Remote Keyless Entry

Garage Door Openers

Remote Controls

Wireless Sensors

Wireless Computer Peripherals

Security Systems

Toys

Video Game Controllers

Medical Systems