Datasheet MICRF001 Datasheet (Micrel)

Application Hint 38 Micrel

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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

tion

for crystal parameters. MICRF001 crystal Q must be

Application Note 32: Receiver Crystal Selec-

greater then 115,000. ESR must be 100Ω or less.

Crystal T esting

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.

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

f

=

=

f

130

TX

LO

TX

2.00

1

+

390

, in MHz

f

LO

f

T

Nominal f

315.00MHz (fT = 2.4107MHz)

390.00MHz (fT = 2.9847MHz)

418.00MHz (fT = 3.1990MHz)

433.92MHz (fT = 3.3208MHz)

Suggested Crystal Manufacturers

Quartztek

Contact: Michael Carpenito
Precision Crystal Products
20 South 48th Avenue
Phoenix, AZ 95043

tel: [phone]
fax: [phone]

www.quartztek.com

Crystal Frequency Part Number Transmit Frequency

2.4107MHz F002A24107 315MHz

2.9847MHz F002A29847 390MHz

3.1990MHz F002A31990 418MHz

3.3208MHz F002A33208 433.92MHz

Abracon Corp

Contact: Chris Pollie
125 Columbia
Aliso Viejo, CA 92656

tel: [phone]
fax: [phone]

http://www.abracon.com

Crystal Frequency Part Number Transmit Frequency

2.4107MHz AB-2.4107MHz-20-D 315MHz

2.9847MHz AB-2.9847MHz-20-D 390MHz

3.1990MHz AB-3.1990MHz-20-D 418MHz

3.3208MHz AB-3.3208MHz-20-D 433.92MHz

MMD Components

Contact: Jason Gann
32-B Mauchly
Irvine, CA 92618

tel: [phone]
fax: [phone]

www.mmdcomp.com

Crystal Frequency Part Number Transmit Frequency

2.4107MHz A15AC1-2.4107 315MHz

2.9847MHz A15AC1-2.9847 390MHz

3.1990MHz A15AC1-3.1990 418MHz

3.3208MHz A15AC1-3.3208 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 [phone] • fax + 1 [phone] • http://www.micrel.com

January 2000 1 Application Hint 38

Application Hint 38 Micrel

ECS

Contact: Dan Kelly
1105 South Ridge View
Olathe, KS 66062

tel: [phone] ext. 111
fax: [phone]

http://www.ecsxtal.com

Crystal Frequency Part Number Transmit Frequency

2.4107MHz ECS-24.107-CD-0151 315MHz

2.9847MHz ECS-29.847-CD-0152 390MHz

3.1990MHz ECS-31.990-CD-0153 418MHz

3.3208MHz ECS-33.208-CD0154 433.92MHz

MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL + 1 [phone] FAX + 1 [phone] 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.

© 1999 Micrel Incorporated

Application Hint 38 2 January 2000