th7108 ETC-unknow, th7108 Datasheet - Page 7

• Manufacturer Part Number: th7108
• Description: 868/915mhz Transmitter Source
• Manufacturer: ETC-unknow

Fig. 2: Test circuit for ASK
Test circuit component list to Fig. 2
TH71082 Data Sheet
3901071082
Test Circuit
XTAL
Part
CF1
CF2
RF1
CX
C1
C2
C3
C4
R1
R2
L1
L2
with 50 matching network
HC49/S
Size
0603
0603
0603
0603
0603
0603
0805
0603
0603
0603
0603
0603
fundamental wave
See output power
See output power
selection table
selection table
27.1344 MHz
100 pF
100 pF
330 pF
270 nH
Value
4.7 nF
6.8 pF
12 nH
56 pF
33 nF
1 k
30ppm temp.
Tolerance
calibration
30ppm
10%
10%
10%
10%
10%
10%
10%
10%
5%
5%
5%
5%
Page 7 of 10
loop filter capacitor
loop filter capacitor
XOSC capacitor
impedance matching capacitor
impedance matching capacitor
blocking capacitor
blocking capacitor
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
crystal, C
R
m, max
OUT
= 40
ASK Transmitter / LO Source
load
CF2
C2
= 12 pF to 15 pF, C
RF1
CF1
L2
Description
CX
C1
XTAL
1 2 3
L1
0, max
TH71082
= 7 pF,
868/915MHz
C3
1 2
1 2
Dec. 2001
R1
Rev. 004
R2
C4
1 2