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| Application Hint 35 Micrel Application Hint 35 MICRF002/RF022/RF011 Crystal Selection by Joe Leon Micrel Crystal Suppliers The following crystal manufacturers have been approved by Micrel Semiconductor. Micrel requires that approved crystal manufacturers test their crystal with the Micrel receiver over the operating temperature range. Please refer to Application Note 32: Receiver Crystal Selection for crystal parameters. MICRF002/RF022 and MICRF011 crystal Q must be greater then 105,000. ESR must be 100 or less. Suggested Crystal Manufacturers Quartztek Contact: Michael Carpenito Precision Crystal Products 20 South 48th Avenue Phoenix, AZ 95043 tel: (602) 272-7944 fax: (602) 233-2440 www.quartztek.com Crystal Frequency Part Number F002A48970 F002A60630 F002A64983 F002A67458 Transmit Frequency 315MHz 390MHz 418MHz 433.92MHz Crystal Testing The following is a quick crystal test and is only applicable with the Micrel receiver. An oscilloscope with a 300MHz, 8pF scope probe is all that is necessary to test the basic operation. In the ac-coupled mode, monitor the REF OSC pin and note the voltage. A sine wave of amplitude greater than 300mV peak-to-peak for the MICRF002/022/011 must be observed. This takes into account the loading affect of the scope probe. Using a heat gun, apply heat and note that the reference oscillator has not stopped oscillating or decreased in voltage by more than 20%. Surface mount crystal have not yet been qualified. Contact Micrel applications for further details. 4.8970MHz 6.0630MHz 6.4983MHz 6.7458MHz Abracon Corp Contact: Chris Polley 125 Columbia Aliso Viejo, CA 92656 tel: (949) 448-7070 fax: (949) 448-8484 http://www.abracon.com Crystal Frequency 4.8970MHz 6.0630MHz 6.4983MHz 6.7458MHz Part Number Transmit Frequency 315MHz 390MHz 418MHz 433.92MHz Operating Frequency Included are the common crystal frequencies used with the Micrel receivers. Also included are the appropriate formulas. Crystal accuracy must be to four decimal places. AB-4.8970MHz-20-D AB-6.0630MHz-20-D AB-6.4983MHz-20-D AB-6.7459MHz-20-D f fLO = fTX + 1.064 TX 390 fT = fLO 64.50 Nominal fTX 315.00MHz (fT = 4.8970MHz) 390.00MHz (fT = 6.0630MHz) 418.00MHz (fT = 6.4983MHz) 433.92MHz (fT = 6.7458MHz) MMD Components Contact: Jason Gann 32-B Mauchly Irvine, CA 92618 tel: (949) 753-5888 fax: (949) 753-5889 www.mmdcomp.com Crystal Frequency 4.8970MHz 6.0630MHz 6.4983MHz 6.7458MHz Part Number A15AC1-4.8970 A15AC1-6.0630 A15AC1-6.4983 A15AC1-6.7458 Transmit Frequency 315MHz 390MHz 418MHz 433.92MHz continued... 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 October 1999 1 Application Hint 35 Application Hint 35 ECS Contact: Dan Kelly 1105 South Ridgeview Olathe, KS 66062 tel: (913) 782-7787 ext. 111 fax: (913) 732-6991 http://www.ecsxtal.com Crystal Frequency 4.8970MHz 6.0630MHz Part Number Transmit Frequency 315MHz 390MHz 418MHz 433.92MHz Micrel ECS-48.97-CD-0065 ECS-60.63-CD-0066 6.4983MHz ECS-64.983-CD-0067 6.7458MHz ECS-67.458-CD0068 MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 TEL USA + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com 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) 1999 Micrel Incorporated Application Hint 35 2 October 1999 |
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