GENERAL DESCRIPTION
Micrel’s The receiver architecture is super-heterodyne. The MICRF218 is a true RF in, data out receiver. IF filter and image rejection functions are built-in. Dual IF bandwidths enable the MICRF218 to capture signals from either high performance or low cost transmitters. In addition, all post-detection data filtering is provided on the MICRF218. The user has a choice of four filter bandwidths that may be selected externally in binary steps, from 1.25 kHz to 10 kHz. The user only needs to program the device with a set of easily determined values, based upon data rate, code modulation format, and desired duty-cycle operation. The MICRF218 has a shutdown control for duty-cycle operation to reduce average current consumption. It has analog RSSI output, indicating the strength of incoming signal. The device is unique for its ability to “escape” from a jamming source and move to an alternate frequency. Dual IF bandwidths function plus fast response time provide easy implementation of dual frequency operations.
Micrel
