TH72032 Datasheet, PDF (17/20 Pages) Melexis Microelectronic Systems – 868/915MHz ASK Transmitter

6 Test Circuit
OUT
CM2
CM1
LM CM3
LT
8
7
CB1
RPS
6
5
TH72032
868/915MHz
ASK Transmitter
12 3
XTAL
CX1
CB0
12 3 12
Fig. 17: Test circuit for ASK with 50 Ω matching network
6.1 Test circuit component list to Fig. 17
Part Size Value @
868.3 MHz
Value @
915 MHz
Tolerance
Description
CM1
CM2
CM3
LM
LT
CX1
RPS
CB0
CB1
XTAL
0805
0805
0805
0805
0805
0805
0805
0805
0603
HC49/S
1.8 pF
2.2 pF
5.6 pF
5.6 pF
68 pF
68 pF
12 nH
10 nH
15 nH
10 nH
27 pF
27 pF
see section 4.6
220 nF
330 pF
27.13438 MHz 28.59375 MHz
±5%
±5%
±5%
±5%
±5%
±5%
±50%
±20%
±10%
±30ppm calibr.
±30ppm temp.
impedance matching capacitor
impedance matching capacitor
impedance matching capacitor
impedance matching inductor, note 2
output tank inductor, note 2
XOSC capacitor, note 1
power-select resistor
de-coupling capacitor
de-coupling capacitor
fundamental wave crystal,
C_L = 12 pF, C_{0, max} = 7 pF, R₁ = 40 Ω
Note 1: value depending on crystal parameters
Note 2: for high-power applications high-Q wire-wound inductors should be used
3901072032
Rev. 008
Page 17 of 20
Data Sheet
June/07