MICRF022

An on-board oscillator within the MICRF002, MICRF011, and MICRF022, together with an externally connected resonator or clock signal, establishes the operating frequency of the MICRF002/RF011/RF022. When using a resonator (ceramic resonator or crystal), its series resistance should be minimized to ensure oscillation. If the resonator series resistance is too great, the oscillator may operate at a diminished peak-to-peak level or may fail to oscillate entirely. Micrel recommends that series resistance for ceramic resonators and crystals not exceed 50 and 100, respectively.

A family of ceramic resonators manufactured by Murata Electronics, featuring low series resistance, has been characterized with the MICRF011/RF022/RF002. This characterization of MICRF022 was performed with the IC operating in "sweep" mode. These standard resonators (see table on following page) provide a convenient solution for many common frequencies. Sample quantities of standard resonators are available from Murata Electronics (www.murata.com) for rapid prototyping. Murata can also provide resonators at custom frequencies for high-volume applications.