7 / 10 page
TH71081
868/915MHz
ASK Transmitter / LO Source
3901071081
Page 7 of 10
Data Sheet
Rev. 004
Dec. 2001
Test Circuit
Fig. 2: Test circuit for ASK
with 50
Ω matching network
Test circuit component list to Fig. 2
Part
Size
Value
Tolerance
Description
CF1
0603
4.7 nF
±10%
loop filter capacitor
CF2
0603
56 pF
±10%
loop filter capacitor
CX
0603
18 pF
±10%
XOSC capacitor
C1
0603
0.68 pF
±5%
impedance matching capacitor
C2
0603
33 pF
±5%
impedance matching capacitor
C3
0805
2.2 pF
±5%
impedance matching capacitor
C4
0603
330 pF
±10%
blocking capacitor
C5
0603
330 pF
±10%
blocking capacitor
C6
0805
33 nF
±10%
blocking capacitor
L1
0603
8.2 nH
±5%
impedance matching inductor
L2
0603
15 nH
±5%
impedance matching inductor
L3
0603
22 nH
±5%
impedance matching inductor
RF1
0603
1.0 k
Ω±10%
loop filter resistor
R1
0603
See output power
selection table
±10%
ASK power-select resistor, not requirement at CW mode
R2
0603
See output power
selection table
±10%
ASK or CW mode power-select resistor
XTAL
HC49/S
27.1344 MHz
fundamental wave
±30ppm
calibration
±30ppm temp.
crystal, Cload = 12 pF to 15 pF, C0, max = 7 pF,
Rm, max = 40
Ω
L1
L2
XTAL
CX
RF1
R2
CF1
CF2
C1
12
12 3
C4
OUT
C3
L3
C2
R1
C6
1 2
C5
New Zealand ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
