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MICRF219 데이터시트(PDF) 14 Page - Micrel Semiconductor

부품명 MICRF219
상세설명  300MHz to 450MHz ASK Receiver with RSSI, Auto-Poll, Bit-Check and Squelch
PDF  24 Pages
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제조업체  MICREL [Micrel Semiconductor]
홈페이지  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF219 데이터시트(HTML) 14 Page - Micrel Semiconductor

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Micrel
MICRF219
January 2009
14
M9999-011509
(408) 944-0800
Figure 6. Plotting of shunt inductor and s
capacitor.
Crystal Selection
eries
ely) is the
reference clock for all the device internal circuits.
Cryst
stic
lo
e,
30pp
< 50Ω,
C to +10
range
d. Ta
ows M
crysta
liers
s
as
(ww
Crystal Y1 or Y1A (SMT or leaded respectiv
al characteri
s of 10pF
ad capacitanc
m, ESR
-40º
5ºC temperature
are desire
ble 5 sh
icrel’s approved
l
supp
uch
w.hib.com.br
or
http:/
racon.co
/www.ab
m/ ) and the fre
The oscillator of the
aken when laying out
long traces and place
p layer close to the
When care is not taken
used are not verified,
time to start. Time-to-
be longer as well. In
some cases, if the stray capacitance is too high (>
the receiving central
or the oscillator may not
lated by REFOSC = RF
oscillator is low side
= 432.68MHz), that is,
carrier frequency and
the image frequency is below the LO frequency. See
Figure 7
. 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.
quencies.
oscillator. Good care must be t
the printed circuit board. Avoid
the ground plane on the to
REFOSC pins RO1 and RO2.
in the layout, and the crystals
the oscillator may take longer
good-data in the DO pin will
20pF). In this case, either
frequency will offset too much
start.
The crystal frequency is calcu
Carrier/(32+(1.1/12)). The local
injection (32 × 13.52127MHz
its frequency is below the RF
MICRF219 is a Pierce-type
de Injection Local Oscillator.
REFOSC (MHz)
Carrier (MHz)
HIB Part Number
Abracon Part Number
Figure 7. Low Si
9.81563
315.0
SA-9.815630-F-10-H-30-30-X
ABLS-9.81563MHz-10J4Y
12.15269
390.0
SA-12.152690-F-10-H-30-30-X
ABLS-12.15269MHz-10J4Y
13.02519
418.0
SA-13.025190-F-10-H-30-30-X
ABLS-13.025190MHz-10J4Y
13.52127
433.92
SA-13.521270-F-10-H-30-30-X
ABLS-13.521270MHz-10J4Y
Table 4. Crystal Frequencies and Vendor Part Numbers.



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