TH72002

315MHz

ASK Transmitter

Page 18 of 21

REVISION 011 - JUNE 13, 2017

3901072002

6. Test Circuit

Fig. 17:

6.1. Test circuit component list to Fig. 18

Part

Size

Value @

315 MHz

Tolerance

Description

CM1

0805

10 pF

5%

impedance matching capacitor

CM2

0805

15 pF

5%

impedance matching capacitor

CM3

0805

82 pF

5%

impedance matching capacitor

LM

0805

47 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 para. 4.6

5%

power-select resistor

CB0

1206

220 nF

20%

blocking capacitor

CB1

0805

330 pF

10%

blocking capacitor

XTAL

HC49/S

9.84375MHz

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

2 3

1