General Description

The MAX7042 fully integrated, low-power, CMOS superheterodyne RF receiver is designed to receive  frequency-shift-keyed (FSK) data at rates up to 66kbps nonreturn-to-zero (NRZ) (33kbps Manchester). The MAX7042 requires only a few external components to realize a complete wireless RF receiver at 308, 315, 418, and 433.92MHz.

The MAX7042 includes all the active components

required in a superheterodyne receiver including a low noise amplifier (LNA), an image-rejection (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 regulator. Differential peak-detecting data demodulators are included for baseband data recovery.

The MAX7042 is available in a 32-pin TQFN and is specified over the automotive -40°C to +125°C temperature range.

Features

♦ +2.4V to +3.6V or +4.5V to +5.5V Single-Supply Operation

♦ Four User-Selectable Carrier Frequencies

   308, 315, 418, and 433.92MHz

♦ -110dBm RF Input Sensitivity at 315MHz

♦ -109dBm RF Input Sensitivity at 433.92MHz

♦ Fast Startup (< 250µs)

♦ Small 32-Pin TQFN Package

♦ Low Operating Supply Current

   6.2mA Continuous

   20nA Power-Down

♦ Integrated PLL, VCO, and Loop Filter

♦ 45dB Integrated Image Rejection

♦ Selectable IF BW with External Filter

♦ Positive and Negative Peak Detectors

♦ RSSI Output

Applications

   Remote Keyless Entry

   Tire-Pressure Monitoring

   Home and Office Lighting Control

   Remote Sensing

   Smoke Alarms

   Home Automation

   Local Telemetry Systems

   Security Systems