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| Application Hint 34 Micrel Application Hint 34 MICRF002/RF011/RF022 Ceramic Resonators Ceramic Resonator Series Resistance 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. Ceramic Resonator Availability A family of ceramic resonators manufactured by Murata Electronics, featuring low series resistance, has been characterized with the MICRF011/RF022/RF002. This characterization 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. Resonator Frequency = fT = fTX 64.25 Receive Frequency 315MHz 390MHz 418MHz 433.92MHz Resonator Frequency 4.903MHz 6.07MHz 6.506MHz 6.754MHz Murata Part No. CST0490MGO3052 CST5607MGO3052 CSTS0650MGO3052 CSTS0675MGO3052 Ceramic Resonator Samples Available Through Micrel Semiconductor Also see full table on following page. QwikRadio is a trademark of Micrel, Inc. The QwikRadio ICs were developed under a partnership agreement with AIT of Orlando, Florida Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com March 2000 1 Application Hint 34 Murata Ceramic Resonators for the Micrel MICRF002, MICRF011, and MICRF022 (Note 1) Resonator Frequency Leaded Consumer Grade (Note 2) Leaded Automotive Grade (Note 3) SMD Consumer Grade (Note 2) CSAC4.66MGC05052-TC CSAC4.66MGCM05052-TC Note 4 CSA4.66MGA05052 CSA4.66MG05052 4.669MHz SMD Automotive Grade (Note 3) CSA4.66MGCA05052-TC CSA4.66MGCMA05052-TC Note 4 Receive Frequency Application Hint 34 Application Hint 34 4.747MHz CSA4.74MG05052 CSA4.74MGA05052 CSAC4.74MGC05052-TC CSAC4.74MGCA05052-TC CSAC4.74MGCM05052-TC CSAC4.74MGCMA05052-TC Note 4 Note 4 CSAC4.90MGC05052-TC CSAC4.90MGCA05052-TC CSAC4.90MGCM05052-TC CSAC4.90MGCMA05052-TC Note 4 Note 4 CSTCC6.02MG03052-TC Note 6 CSTCC6.07MG03052-TC Note 6 CSTCC6.17MG03052-TC Note 6 CSTCC6.22MG03052-TC Note 6 CSTCC6.45MG03052-TC Note 6 CSTCC6.50MG03052-TC Note 6 CSTCC6.66MG03052-TC Note 6 CSTCC6.75MG03052-TC Note 6 CSTCC6.02MGA03052-TC Note 6 CSTCC6.07MGA03052-TC Note 6 CSTCC6.17MGA03052-TC Note 6 CSTCC6.22MGA03052-TC Note 6 CSTCC6.45MGA03052-TC Note 6 CSTCC6.50MGA03052-TC Note 6 CSTCC6.66MGA03052-TC Note 6 CSTCC6.75MGA03052-TC Note 6 4.903MHz CSA4.90MG05052 CSA4.90MGA05052 6.023MHz CSA6.02MG05052 CSA6.02MGA05052 CSA6.07MGA05052 CSA6.17MGA05052 CSA6.22MGA05052 CSTS0645MGA03052 Note 5 CSTS0650MGA03052 Note 5 CSTS0666MGA03052 Note 5 CSTS0675MGA03052 Note 5 CSA6.07MG05052 CSA6.17MG05052 CSA6.22MG05052 CSTS0645MG03052 Note 5 CSTS0650MG03052 Note 5 CSTS0666MG03052 Note 5 CSTS0675MG03052 Note 5 6.070MHz 6.176MHz 6.226MHz 6.459MHz 6.506MHz 6.662MHz 6.754MHz 300MHz 305MHz TEL 315MHz 387MHz + 1 (408) 944-0800 390MHz FAX 396.8MHz 400MHz + 1 (408) 944-0970 MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. (c) 2000 Micrel Incorporated 2 415MHz 418MHz WEB 428.02MHz 433.92MHz http://www.micrel.com Note 1. Murata sorts the above recommended resonators for 100% operation with the Micrel MICRF002, MICRF011, and MICRF022. Sorting insures stable oscillation and startup over resonator production variation and operating temperature range. It also insures that the specified initial oscillator frequency of the resonator will be achieved with the Micrel MICRF002, MICRF011, and MICRF022. Unsorted resonators could experience general stability problems and repeating initial oscillation frequency shifts due to the difference between the Micrel ICs and the standard resonator test circuit used in resonator production. USA Note 2. Consumer grade is for the -20C to +80C operating range and is intended for nonautomotive applications. Note 3. Automotive grade, indicated by the "A" part number suffix, is for the -40C to +125C operating range and is intended for automotive applications. Note 4. CSACx.xxMGCxxxxx-TC is a melph package (cylindrical package). If a round component is of a concern, Murata can recommend the CSACx.xxMGCMxxxxx-TC which adds a square plastic sleeve to the middle of the package. The square sleeve allows for automatic placement without a cylinder placement nozzle. Note 5. CSTSxxxxMG(A)xxxxx is a three-terminal resonator. CAUTION: The middle terminal or lead should not be connected or grounded. Note 6. CSTCCx.xxMG(A)xxxxx-TC is a three terminal resonator. CAUTION: The middle terminal should not be connected or grounded. March 2000 Micrel |
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