TH72005_12 Datasheet, PDF (17/20 Pages) Melexis Microelectronic Systems – FSK/ASK Transmitter

6 Test Circuit
TH72005
315MHz
FSK/ASK Transmitter
CM2 CM1
CM3
LM
OUT
LT
CB1
RPS
10 9 8 7 6
123 45
CX2
CX1
CB0
XTAL
12 12 3 4
12 3
Fig. 18: Test circuit for FSK and ASK with 50 Ω matching network
6.1 Test circuit component list to Fig. 18
Part Size
Value @
315 MHz
Tolerance
Description
CM1
CM2
CM3
LM
LT
CX1_FSK
CX1_ASK
CX2
0805
0805
0805
0805
0805
0805
0805
0805
RPS
CB0
CB1
XTAL
0805
1206
0805
HC49/S
10 pF
15 pF
82 pF
47 nH
33 nH
15 pF
27 pF
47 pF
see para. 4.6
220 nF
330 pF
9.84375MHz
±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 for ASK, note 1
XOSC capacitor (∆f = ±20 kHz), note 1
only needed for FSK
power-select resistor
blocking capacitor
blocking capacitor
fundamental wave crystal,
CL = 12 pF, C0, max = 7 pF, R1 = 60 Ω
Note 1: value depending on crystal parameters
Note 2: for high-power applications high-Q wire-wound inductors should be used
3901072005
Rev. 011
Page 17 of 20
Data Sheet
Jul/12