Application Hint 31
Micrel
Application Hint 31
Ceramic Resonators for the MICRF001
by Tom Yestresbsky
Ceramic Resonators and
Series Resistance
An on-board oscillator within the MICRF001, together with an
externally connected resonator or clock signal, establishes
the operating frequency of the MICRF001. When using a
resonator (ceramic resonator or crystal), its series resistance
should be minimized to the extent possible, to ensure oscil-
lation. In case where the resonator series resistance is too
great, the oscillator may oscillate at a diminished peak-to-
peak level, or may fail to oscillate entirely. Micrel recom-
mends that series resistances for ceramic resonators and
crystals not exceed 50鈩?and 100鈩? respectively.
Murata Part Number
(Leaded Package)
CSA2.44MG05051
CSA3.00MG05051
CSA3.02MG05051
CSA3.07MG05051
CSA3.21MG05051
CSA3.24MG05051
CSA3.31MG05051
CSA3.36MG05051
Ref. Freq.
f
T
2.44MHz
3.00MHz
3.02MHz
3.07MHz
3.21MHz
3.24MHz
3.31MHz
3.36MHz
TX Freq.
f
TX
315MHz
387MHz
390MHz
396MHz
414MHz
418MHz
427MHz
433.9MHz
Ceramic Resonators Availability
A family of ceramic resonators, manufactured by Murata
Electronics, and providing low series resistance, has been
characterized with the MICRF001 in SWP mode. These
standard values (shown in the table below) provide a conve-
nient solution for many common frequencies worldwide.
Sample quantities of these standard values are stocked by
Murata Electronics for rapid-protyping purposes
(www.murata.com). Murata can also provide resonators for
custom frequencies and high-volume applications.
Murata Part Number
(Surface-Mount Package)
CSAC2.44MGC05051-TC
CSAC3.00MGC05051-TC
CSAC3.02MGC05051-TC
CSAC3.07MGC05051-TC
CSAC3.21MGC05051-TC
CSAC3.24MGC05051-TC
CSAC3.31MGC05051-TC
CSAC3.36MGC05051-TC
Ref. Freq.
f
T
2.44MHz
3.00MHz
3.02MHz
3.07MHz
3.21MHz
3.24MHz
3.31MHz
3.36MHz
TX Freq.
f
TX
315MHz
387MHz
390MHz
396MHz
414MHz
418MHz
427MHz
433.9MHz
QwikRadio is a trademark of Micrel, Inc. The QwikRadio ICs were developed under a partnership agreement with AIT of Orlando, Florida
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
July 1999
1
Application Hint 31
1
2
