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MRF49XA
4.0
APPLICATION DETAILS
The application circuit of MRF49XA with a balun circuit
is shown in Figure 4-1 .
FIGURE 4-1:
APPLICATION CIRCUIT
V DD
C1
2 .2 u F
RC7
IN T /D IO *
C3
0 .0 1 u F
C2
(see
Table 2-2)
RC6
RC5
SDI
SCK
1
2
16
15
RC4
CS
3
14
C4*
2 .2 n F
P IC ? M C U
RC3
RC2
RC1
RC0
OSC1
SDO
IR O
F S K /D A T A /F S E L *
R C L K O U T /F C A P /F IN T *
C LK O U T*
4
5
6
7
8
13
12
11
10
9
B a lu n
50 O hm Loop
A n te n n a
4.1
_____
M C LR
* C o n n e c tio n s a re o p tio n a l.
Antenna/Balun
RESET*
X1
10 M H z
A balun circuit for a 50 Ω antenna is shown in
Figure 4-2 . If low tolerance components (i.e., ±5%) are
used with an appropriate ground, the impedance
remains close to the 50 Ω measurement.
FIGURE 4-2:
BALUN CIRCUIT
+3.3V
L1
RFN
L2
C5
L3
C6
J1
50 Ω ANT
RFP
C7
Freq.
868 MHz
433 MHz
915 MHz
L1
390 nH
100 nH
100 nH
L2
33 nH
8.2 nH
8.2 nH
L3
47 nH
22 nH
22 nH
C5
2.7 pF
1.2 pF
1.2 pF
C6
68 pF
27 pF
27 pF
C7
5.1 pF
2.7 pF
2.7 pF
? 2009-2011 Microchip Technology Inc.
Preliminary
DS70590C-page 73
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