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

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.

Applications

* 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

* 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

* AEC-Q100 Qualified (MAX1471ATJ/V+ Only)