TH71081EDC データシートの表示（PDF） - Melexis Microelectronic Systems
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TH71081EDC Datasheet PDF : 12 Pages
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5 Test Circuit
Not recommended for new designsTH71081
868/915MHz
ASK Transmitter / LO Source
OUT
C3
L2
L1 C4
L3 C2 C1
C5
Fig. 2: Test circuit for ASK with 50Ω matching network
CX
RF1
XTAL
CF2 CF1
R2
R1
C6
12 3 12 12
5.1 Test circuit component list to Fig. 2
Part Size
Value
Tolerance
CF1
CF2
CX
C1
C2
C3
C4
C5
C6
L1
L2
L3
RF1
R1
R2
XTAL
0603
0603
0603
0603
0805
0805
0603
0603
0805
0603
0603
0603
0603
0603
0603
HC49/S
4.7 nF
56 pF
18 pF
0.68 pF
33 pF
2.2 pF
330 pF
330 pF
33 nF
8.2 nH
15 nH
22 nH
1.0 kΩ
see para. 4.6
see para. 4.6
27.1344 MHz
±10%
±10%
±5%
±5%
±5%
±5%
±5%
±10%
±10%
±5%
±5%
±5%
±10%
±10%
±10%
±30ppm calibr.
±30ppm temp.
Note 1: value depending on crystal parameters
Description
loop filter capacitor
loop filter capacitor
XOSC capacitor, note 1
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
ASK power-select resistor, not requirement at CW mode
ASK or CW mode power-select resistor
fundamental wave crystal,
CL = 12 pF, C0, max = 7 pF, R1 = 40 Ω
3901071081
Rev. 009
Page 8 of 12
Data Sheet
May/05
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