TH71111
868/915MHz
FSK/FM/ASK Receiver
4
Test Circuits
4.1 Standard FSK Reception
4.1.1
Standard FSK Application Circuit
OUTP
RSSI
FSK output
C16
R4
C17
C15
R5
VCC
CERDIS
XTAL
16
25
26
VEE
RO
C12
C1
C3
OUT_IFA
VCC
15
14
27 VCC
VCC
VCC
C11
28 ENRX
FBC2 13
FBC1 12
ENRX
C9
R2
TH71111
LF
29
30
31
32
C10
R1
IN_IFA
11
VEE 10
VEE
IN_LNA
VCC
OUT_MIX2
9
C5
VCC
CERFIL
L2
3
5
6
8
1
2
4
7
C7
6
4
3
SAWFIL
1
L1
L3
C4
CB*
VCC
50
* each Vcc pin with blocking cap of 330pF
* one global Vcc blocking cap of 33nF
RF input
Fig. 2: Test circuit for FSK reception
Circuit Features
• Tolerates input frequency variations
• Well-suited for NRZ, Manchester and similar codes
39010 71111
Rev. 013
Page 12 of 22
Data Sheet
June/07
MELEXIS [ Melexis Microelectronic Systems ]
