TH72031KDC Melexis Inc, TH72031KDC Datasheet - Page 17

• Manufacturer Part Number: TH72031KDC
• Description: 868/915 MHZ, FSK TRANSMITTER
• Manufacturer: Melexis Inc

Specifications of TH72031KDC

• Frequency: 868MHz, 915MHz
• Applications: Alarm and Security Systems, RKE
• Modulation Or Protocol: FSK
• Data Rate - Maximum: 40 kbps
• Power - Output: -11dBm ~ 9dBm
• Current - Transmitting: 5.1mA ~ 13.4mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 1.9 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Memory Size: -
• Other names: Q3477881B

6 Test Circuit
6.1 Test circuit component list to Fig. 18
Note 1: value depending on crystal parameters
Note 2: for high-power applications high-Q wire-wound inductors should be used
3901072031
Rev. 010
XTAL
Part
CM1
CM2
CM3
RPS
CX1
CX2
CB0
CB1
LM
LT
HC49/S
Size
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
27.13438 MHz
868.3 MHz
Value @
1.8 pF
5.6 pF
68 pF
12 nH
15 nH
18 pF
10 pF
Fig.18:
see section 4.6
220 nF
330 pF
OUT
Test circuit for FSK with 50 Ω matching network
28.59375 MHz ±30ppm calibr.
Value @
915 MHz
CM2
2.2 pF
5.6 pF
10 nH
10 nH
68 pF
18 pF
10 pF
1
LM
2 3
8
CM3
CX2
CM1
Page 17 of 20
±30ppm temp
7
Tolerance
CB0
LT
±20%
±10%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
±5%
6
CX1
CB1
XTAL
1
2 3
impedance matching capacitor
impedance matching capacitor
impedance matching capacitor
impedance matching inductor, note 2
output tank inductor, note 2
XOSC capacitor (Δf = ±20 kHz), note 1
XOSC capacitor (Δf = ±20 kHz), note 1
power-select resistor
de-coupling capacitor
de-coupling capacitor
fundamental wave crystal,
C
5
L
RPS
= 12 pF, C
1
2
0, max
Description
= 7 pF, R
FSK Transmitter
TH72031
868/915MHz
1
= 40 Ω
Data Sheet
Jan/09