The MICRF213, the newest member of Micrel’s QwikRadio® RF receiver IC family
that features enhanced sensitivity and selectivity. The device continues to lead the industry in distance performance. The MICRF213, Figure 1, is a general purpose, 3.3V QwikRadio® receiver operating in the 315MHz range. All of Micrel’s QwikRadio® RF receivers are designed to meet the rigorous cost and design cycle needs of quickly developing RF applications, see Figure 2 for a typical applications diagram.

The device’s operating frequency band is from 300MHz to 350MHz. It offers designers a low current consumption of 3.9mA @ 315MHz. The MICRF213 features up to –110dBm sensitivity and functions as a super-heterodyne receiver for OOK and ASK modulation up to 7.2kbps @ 315 MHz operating frequency. The down-conversion mixer also provides image rejection to improve communication distance. All post-detection data filtering is built-in on the MICRF213. There are four filter bandwidths may be selected externally by the user in binary steps, from 1.18kHz –9.44kHz @ 315 MHz operating frequency. The designer need only configure the device with a set of easily determined values, based upon data rate, code modulation format, and desired duty-cycle operation.

The down-conversion mixer also provides image rejection. All post-detection data filtering is provided on the MICRF213. Any one of four filter bandwidths may be selected externally by the user using binary steps (from 1.18 kHz to 9.44kHz, Manchester Encoded). The user need only configure the device with a set of easily determined values, based upon data rate, code modulation format, and desired duty-cycle operation.