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.

特性 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