th71112 Melexis Company, th71112 Datasheet - Page 12

• Manufacturer Part Number: th71112
• Description: Receiver - 868/915mhz Fsk/ask, Double-conversion Superhet Lqfp32
• Manufacturer: Melexis Company

4
4.1
4.1.1
Circuit Features
39010 71112
Rev. 014
Test Circuits
Standard FSK Reception
Standard FSK Application Circuit
• Tolerates input frequency variations
• Well-suited for NRZ, Manchester and similar codes
L2
L1
6
1
ENRX
RF input
XTAL
R1
4
3
C5
C4
50
SAWFIL
VCC
VCC
C1
C3
OUTP
25
26
27
28
29
30
31
32
Fig. 2: Test circuit for FSK reception
C15
R5
VEE
RO
VCC
ENRX
LF
VEE
IN_LNA
VCC
1
L3
2
TH71112
C16
R4
* each Vcc pin with blocking cap of 330pF
* one global Vcc blocking cap of 33nF
3
C7
Page 12 of 22
4
RSSI
C17
5
6
C8
7
OUT_MIX2
FSK output
OUT_IFA
8
IN_IFA
FBC2
VCC
FBC1
VCC
VEE
CB*
16
15
14
12
10
13
11
9
C12
VCC
C9
CERDIS
R2
CERFIL
FSK/ASK Receiver
C11
C10
VCC
TH71112
868/915MHz
Data Sheet
April/08