MICRF218

www.DataSheet4U.com MICRF218 3.3V, QwikRadio 300 MHz to 450 MHz Receiver ® General Description Micrel’s MICRF218 is the world’s first integrated ASK / OOK receiver with selectable dual IF bandwidths for 300~450 MHz operation. The receiver architecture is super-heterodyne. The MICRF218 has fully integrated IF section with image rejection to bring performance, simplicity and ease of implementation to the receiver portion of RF actuation. 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. It can accommodate two reference crystals with the use of an external switch. Once the system ...