TH72012

433MHz

ASK Transmitter

39010 72012

Page 17 of 20

Data Sheet

Rev. 009

July/06

6

Test Circuit

Fig. 18: Test circuit for ASK with 50

Ω matching network

6.1

Test circuit component list to Fig. 18

Part

Size

Value @

433.92 MHz

Tolerance

Description

CM1

0805

5.6 pF

±5%

impedance matching capacitor

CM2

0805

10 pF

±5%

impedance matching capacitor

CM3

0805

82 pF

±5%

impedance matching capacitor

LM

0805

33 nH

±5%

impedance matching inductor, note 2

LT

0805

33 nH

±5%

output tank inductor, note 2

CX1

0805

27 pF

±5%

XOSC capacitor, note 1

RPS

0805

see section 4.6

±5%

power-select resistor

CB0

1206

220 nF

±20%

de-coupling capacitor

CB1

0805

330 pF

±10%

de-coupling capacitor

XTAL

HC49/S

13.56000 MHz

±30ppm calibr.

±30ppm temp.

fundamental wave crystal,

Note 1: value depending on crystal parameters

Note 2: for high-power applications high-Q wire-wound inductors should be used

RPS

XTAL

6

7

8

5

CX1

CM1

LT

CM3

CM2

OUT

LM

CB1

CB0

2 3

1

2

1

23

1