MRF49XA datasheet(73/102 Pages) MICROCHIP

73 / 102 page

Preliminary

DS70590B-page 71

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

RC7

RC 6

RC5

RC 4

RC 3

RC 2

RC1

RC 0

OS C 1

PIC

® MC U

C4 *

2.2 nF

2.2 uF

V DD

0 .01 uF

(see

Table 2-2)

50 O hm Loop

Antenn a

10 M H z

* C onn ectio ns a re optional.

MC L R

_____

SD I

SC K

SD O

RCLK O U T /F C A P/F INT *

CLK O UT *

Ba lun

IN T /D IO *

IR O

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

R ESET *

+3.3V

50Ω ANT

RFP

RFN

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

MRF49XA Datasheet(PDF) 73 Page - Microchip Technology

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