General Description

The MLX71121 is a multi-band, single-channel RF receiver based on a double-conversion super-heterodyne architecture. It can receive FSK and ASK modulated signals. The IC is designed for general purpose applications for example in the European bands at 433MHz and 868MHz or for similar applications in North America or Asia, e.g. at 315MHz or 915MHz.

The receiver’s extended temperature and supply voltage ranges make the device a perfect fit for automotive or similar applications where harsh environmental conditions are expected.

Features

❐ Dual RF input for antenna space and frequency diversity, LNA cascading or differential feeding

❐ Fully integrated PLL-based synthesizer

❐ 2nd mixer with image rejection

❐ Reception of ASK or FSK modulated signals

❐ Wide operating voltage and temperature ranges

❐ Very low standby current consumption

❐ Low operating current consumption

❐ Internal IF filter

❐ Internal FSK demodulator

❐ Average or peak detection data slicer mode

❐ RSSI output with high dynamic range for RF level indication

❐ Output noise cancellation filter

❐ MCU clock output

❐ High over-all frequency accuracy

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