TH72001 Datasheet, PDF (17/20 Pages) Melexis Microelectronic Systems – 315MHz FSK Transmitter

6 Test Circuit
OUT
CM2
CM1
LM CM3
LT
8
7
CB1
RPS
6
5
TH72001
315MHz
FSK Transmitter
CX2
XTAL
CX1
12 3
CB0
12 3 12
Fig. 18: Test circuit for FSK with 50 Ω matching network
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
LM
LT
CX1
CX2
RPS
CB0
0805
0805
0805
0805
0805
0805
1206
82 pF
47 nH
33 nH
15 pF
47 pF
see section 4.6
220 nF
±5%
±5%
±5%
±5%
±5%
±5%
±20%
impedance matching capacitor
impedance matching inductor, note 2
output tank inductor, note 2
XOSC capacitor (Δf = ±20 kHz), note 1
XOSC capacitor (Δf = ±20 kHz), note 1
power-select resistor
de-coupling capacitor
CB1
0805
330 pF
±10%
de-coupling capacitor
XTAL HC49/S
9.84375MHz
±30ppm calibr. fundamental wave crystal,
±30ppm temp. 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
3901072001
Rev. 007
Page 17 of 20
Data Sheet
June/07