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Micrel
Crystal Y1 or Y1A (SMT or leaded respectively) is the
reference clock for all the device internal circuits.
Crystal characteristics of 10pF load capacitance,
30ppm, ESR < 50 ? , -40oC to +105oC temperature
range are desired. Table 5 shows the crystal
frequencies and one of Micrel’s approved crystal
manufacturers (www.hib.com.br).
The oscillator of the MICRF211 is a Colpitts type. It is
very sensitive to stray capacitance loads. Thus, very
good care must be taken when laying out the printed
circuit board. Avoid long traces and ground plane on
the top layer close to the REFOSC pins RO1 and
RO2. When care is not taken in the layout, and
crystals from other vendors are used, the oscillator
may take longer times to start as well as the time to
good data in the DO pin to show up. In some cases, if
the stray capacitance is too high (> 20pF), the
oscillator may not start at all.
The crystal frequency is calculated by REFOSC = RF
Carrier/(32+(1.1/12)). The local oscillator is low side
MICRF211
injection (32 × 13.52127MHz = 432.68MHz), that is,
its frequency is below the RF carrier frequency and
the image frequency is below the LO frequency. See
Figure 6 . The product of the incoming RF signal and
local oscillator signal will yield the IF frequency, which
will be demodulated by the detector of the device.
Figure 6. Low Side Injection Local Oscillator.
REFOSC (MHz)
12.15269
13.02519
13.52127
Carrier (MHz)
390.0
418.0
433.92
HIB Part Number
SA-12.152690-F-10-H-30-30-X
SA-13.025190-F-10-H-30-30-X
SA-13.521270-F-10-H-30-30-X
Table 5. Crystal Frequency and Vendor Part Number.
March 2007
10
M9999-030107
(408) 944-0800
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