TH72036_12 Datasheet, PDF (12/15 Pages) Melexis Microelectronic Systems – FSK/ASK Transmitter

5 Test Circuit
TH72036
868/915MHz
FSK/ASK Transmitter
OUT
CM2
CM1
LM
CM3
LT
CB1
10 9 8
RPS
76
12345
CX1
CB0
12
12 1 23
R1
12 12 12
Fig. 6: Test circuit for FSK and ASK with 50 Ω matching network
5.1 Test circuit component list to Fig. 6
Part Size Value @
Value @ Tolerance
868.3 MHz 915 MHz
Description
CM1
CM2
CM3
LM
LT
CX1_FSK
CX1_ASK
CX2
CCK
RPS
R1
CB0
CB1
XTAL
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
SMD
6x3.5
1.8 pF
5.6 pF
68 pF
12 nH
15 nH
22 pF
27 pF
12 pF
2.2 pF
5.6 pF
68 pF
10 nH
10 nH
22 pF
27 pF
12 pF
15 pF / 180 pF
see section 4.6
see section 4.7
220 nF
330 pF
27.13438 MHz 28.59375 MHz
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±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 FSK capacitor (∆f = ±20 kHz), note 1
XOSC ASK capacitor, trimmed to fC, note 1
XOSC capacitor (∆f = ±20 kHz), note 1
only needed for FSK
clock spur suppression capacitor, CKDIV 0 / 1
FSK or CW mode power-select resistor
ASK power-select resistor, not used at FSK
de-coupling capacitor
de-coupling capacitor
fundamental wave crystal,
CL = 12 pF, C0, 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
3901072036
Rev. 009
Page 12 of 15
Data Sheet
Jun/12