TH7108EFC Melexis Inc, TH7108EFC Datasheet - Page 9

• Manufacturer Part Number: TH7108EFC
• Description: IC XMITTER 868/915MHZ 16-SSOP
• Manufacturer: Melexis Inc

Specifications of TH7108EFC

• Rohs Status: RoHS non-compliant
• Frequency: 850MHz ~ 920MHz
• Applications: Alarm and Security Systems, RKE
• Modulation Or Protocol: ASK, FM, FSK
• Data Rate - Maximum: 40 kbps
• Power - Output: -15dBm ~ 1dBm
• Current - Transmitting: 6.2mA ~ 12.5mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.2 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-SSOP
• Features: -
• Memory Size: -
• Other names: TH7108; TH7108EFF

5
Fig. 2: Test circuit for FSK, ASK and FM;
5.1 Test circuit component list (Fig. 2)
Note 1: value depends on crystal parameters
3901007108
Rev. 008
CX1
CX1
XTAL
Part
CX2
CX3
RPS
CF1
CF2
RF1
RF2
C1
C2
C3
C4
C5
C6
C7
R1
R2
R3
V1
L1
L2
L3
_ASK
_FSK
Test Circuit
with 50 matching network
SOD323
HC49/S
0603
0603
0603
0603
0603
0603
0603
0805
0805
0603
0603
0603
1206
0603
0603
0805
0805
0805
0805
0805
0805
0805
Size
fundamental wave
27.1344 MHz
0.47 pF
470 k
150 pF
330 pF
330 pF
220 nF
Value
1.6 k
2.0 k
BB535
5.6 nF
1.0 pF
1.8 pF
10 nH
15 nH
15 nH
56 k
30 k
27 pF
56 pF
18 pF
1 nF
1 nF
0
30ppm calibr.
30ppm temp.
Tolerance
10%
10%
10%
10%
10%
20%
10%
10%
10%
10%
10%
10%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
Page 9 of 14
OUT
loop filter capacitor
loop filter capacitor
XOSC capacitor for FSK ( f = 30 kHz), note 1
XOSC capacitor for ASK, trimmed to f
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, C
R
m, max
C4
= 40
RF2
CF2
C3
load
C7
L3
= 12 pF to 15 pF, C
FSK/FM/ASK Transmitter
CF1
C2
RF1
1 2
C5
Description
R1
1 2
L1
CX2
CX3
R2
1 2
V1
C1
0, max
TH7108
XTAL
CX1
= 7 pF,
868/915MHz
C,
1 2
L2
note 1
1 2
Data Sheet
C6
3
May/03
1 2
R3
RPS