General Description

The MLX71122 is a multi-channel RF receiver IC based on a double-conversion super-heterodyne architecture. It is designed to receive FSK and ASK modulated RF signals either in 8 predefined frequency channels or frequency programmable via a 3-wire serial programming interface (SPI).

The IC is designed for a variety of applications, for example in the European bands at 433MHz and 868MHz or for the use in North America or Asia, e.g. at 315MHz, 447MHz or 915MHz.

Features

❐ Programmable PLL synthesizer

❐ 8-channel preconfigured or fully programmable SPI mode

❐ Double super-heterodyne receiver architecture with 2nd mixer as image rejection mixer

❐ Reception of FSK, FM and ASK modulated signals

❐ Low shut-down and operating currents

❐ Build-in acceptance of input frequency variations

❐ On-chip IF filter

❐ Fully integrated FSK/FM demodulator

❐ RSSI for level indication and ASK detection

❐ 2nd order low-pass data filter

❐ Positive and negative peak detectors

❐ Data slicer (with averaging or peak-detector adaptive threshold)

❐ EVB programming software is available on Melexis web site

Application Examples

❐ General digital and analog RF receivers at 300 to 930MHz

❐ Tire pressure monitoring systems (TPMS)

❐ Remote keyless entry (RKE)

❐ Low power telemetry systems

❐ Alarm and security systems

❐ Active RFID tags

❐ Remote controls

❐ Garage door openers

❐ Home and building automation