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| Application Hint 38 Micrel Application Hint 38 MICRF001 Crystal Selection Micrel Crystal Suppliers The following crystal manufacturers have been approved by Micrel Semiconductor. Micrel requires that approved crystal manufacturers test their crystals with the Micrel receiver over the operating temperature range. Please refer to Application Note 32: Receiver Crystal Selection for crystal parameters. MICRF001 crystal Q must be greater then 115,000. 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 2.4107MHz 2.9847MHz 3.1990MHz 3.3208MHz Part Number F002A24107 F002A29847 F002A31990 F002A33208 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 200mV peak-to-peak for the MICRF001 must be observed. This takes into account the loading effect 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. Abracon Corp Contact: Chris Pollie 125 Columbia Aliso Viejo, CA 92656 tel: (949) 448-7070 fax: (949) 448-8484 http://www.abracon.com Crystal Frequency 2.4107MHz 2.9847MHz 3.1990MHz 3.3208MHz 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 fTX fLO = 2.00 1+ 390 AB-2.4107MHz-20-D AB-2.9847MHz-20-D AB-3.1990MHz-20-D AB-3.3208MHz-20-D f fT = LO , in MHz 130 Nominal fTX 315.00MHz (fT = 2.4107MHz) 390.00MHz (fT = 2.9847MHz) 418.00MHz (fT = 3.1990MHz) 433.92MHz (fT = 3.3208MHz) MMD Components Contact: Jason Gann 32-B Mauchly Irvine, CA 92618 tel: (949) 753-5888 fax: (949) 753-5889 www.mmdcomp.com Crystal Frequency 2.4107MHz 2.9847MHz 3.1990MHz 3.3208MHz Part Number A15AC1-2.4107 A15AC1-2.9847 A15AC1-3.1990 A15AC1-3.3208 Transmit Frequency 315MHz 390MHz 418MHz 433.92MHz 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 January 2000 1 Application Hint 38 Application Hint 38 ECS Contact: Dan Kelly 1105 South Ridge View Olathe, KS 66062 tel: (913) 782-7787 ext. 111 fax: (913) 732-6991 http://www.ecsxtal.com Crystal Frequency 2.4107MHz 2.9847MHz 3.1990MHz 3.3208MHz Part Number Transmit Frequency 315MHz 390MHz 418MHz 433.92MHz Micrel ECS-24.107-CD-0151 ECS-29.847-CD-0152 ECS-31.990-CD-0153 ECS-33.208-CD0154 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 38 2 January 2000 |
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