Dual-frequency, dual-IF bandwidth receiver for robust communications

The Micrel MICRF218 receiver combines the versatility of dual-frequency, dual-IF bandwidth operation with the convenience of true RF-in/data-out functionality as a member of the Micrel QwikRadio® family. Only three external components are required to build a functioning receiver.

The MICRF218 is the world’s first integrated ASK/OOK receiver with selectable dual IF bandwidths for 300-450MHz operation. Advantages include higher utilisation of the receiver, as well as the ability to capture signals from either high-performance or lowcost transmitters, or to escape from a jamming source by moving to an alternate frequency. With the provision of an external switch, the MICRF218 can accommodate two reference crystals.

As a complete receiver on a chip, the device provides built-in features including IF filtering and image rejection, as well as post-detection data filtering. Minimal programming enhances ease of use, requiring only the data rate, codemodulation format, and desired duty-cycle operation to be determined. A choice of four filter bandwidths, selectable externally, allows the user to adjust the receiver selectivity for optimal reception.

 

FEATURES Built-in image-rejection mixer 4mA active current @ 315MHz 10kbit/s maximum data rate @ 433.92MHz Analogue RSSI output No IF filter required

APPLICATIONS Garage-door openers Remote-sensor data links Wireless actuators and remote controls Infrared transmitter replacement Remote Keyless Entry (RKE) systems

 

Micrel Semiconductor: MICRF218