TH7108 Ver la hoja de datos (PDF) - Melexis Microelectronic Systems
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Lista de partido
TH7108 Datasheet PDF : 14 Pages
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5 Test Circuit
Fig. 2: Test circuit for FSK, ASK and FM;
with 50Ω matching network
TH7108
868/915MHz
FSK/FM/ASK Transmitter
OUT
C4
L3
C1
C3
C2 C5 L1
L2
C6
RPS
RF2
CX2
RF1
XTAL
R3
CX3
CF2
CF1
CX1
V1
R1
R2
C7
12 12 12
12 12 3 12
5.1 Test circuit component list (Fig. 2)
Part Size
Value
Tolerance
CF1
0603
5.6 nF
±10%
CF2
0603
27 pF
±10%
CX1_FSK 0603
56 pF
±5%
CX1_ASK 0603
18 pF
±5%
CX2
0603
1 nF
±5%
CX3
0603
1 nF
±10%
C1
0603
0.47 pF
±5%
C2
0805
1.0 pF
±5%
C3
0805
1.8 pF
±5%
C4
0603
150 pF
±5%
C5
0603
330 pF
±10%
C6
0603
330 pF
±10%
C7
1206
220 nF
±20%
L1
0603
10 nH
±5%
L2
0603
15 nH
±5%
L3
0805
15 nH
±5%
RF1
0805
1.6 kΩ
±10%
RF2
0805
2.0 kΩ
±10%
RPS
0805
56 kΩ
±10%
R1
0805
470 kΩ
±10%
R2
0805
30 kΩ
±10%
R3
0805
0Ω
±10%
V1 SOD323
BB535
XTAL HC49/S 27.1344 MHz
±30ppm calibr.
fundamental wave ±30ppm temp.
Note 1: value depends on crystal parameters
Description
loop filter capacitor
loop filter capacitor
XOSC capacitor for FSK (∆f = ±30 kHz), note 1
XOSC capacitor for ASK, trimmed to fC, note 1
XOSC capacitor (for FSK only), note 1
XOSC capacitor (for FM only)
impedance matching capacitor
impedance matching capacitor
impedance matching capacitor
impedance matching capacitor
blocking capacitor
blocking capacitor
blocking capacitor
impedance matching inductor
impedance matching inductor
impedance matching inductor
loop filter resistor
loop filter resistor
power-select resistor
optional pull-up resistor
varactor bias resistor, (for FM only)
ASK jumper, (for ASK only)
varactor diode (for FM only)
crystal, Cload = 12 pF to 15 pF, C0, max = 7 pF,
Rm, max = 40 Ω
3901007108
Rev. 008
Page 9 of 14
Data Sheet
May/03
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