MRF49XA-ISLASHT datasheet(73/102 Pages) MICROCHIP

73 / 102 page

Preliminary

DS70590C-page 73

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

4.1

Antenna/Balun

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

RC 7

RC6

RC 5

RC4

RC3

RC2

RC 1

RC0

OSC 1

PIC ® MC U

C4 *

2 .2 nF

2.2 u F

V DD

0.01 uF

(see

Table 2-2)

50 O h m Lo op

An te n n a

10 M H z

* C o n n e ction s are o p tiona l.

MC L R

__ __ _

SDI

SCK

SD O

RCL K O UT /F CA P /F INT *

CL K O U T *

Ba lu n

IN T /D IO *

IR O

F SK/D A T A /F S E L *

RE SE T *

+3.3V

Ω ANT

RFN

RFP

Freq.

433 MHz

390 nH

33 nH

47 nH

68 pF

2.7 pF

5.1 pF

868 MHz

100 nH

8.2 nH

22 nH

1.2 pF

27 pF

2.7 pF

915 MHz

100 nH

8.2 nH

22 nH

1.2 pF

27 pF

2.7 pF

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