TH71111
868/915MHz
FSK/FM/ASK Receiver
4.3 FM Reception (Varactor-tuned AFC)
4.3.1
FM Application Circuit
OUTP
OUTN
RSSI
FM
C16
C14
C17
C18
R3
R4
R5
VCC
CP
VD
XTAL
16
25
VEE
RO
C12
C1
C3
OUT_IFA
15
26
CERDIS
C11
VCC 14
27 VCC
VCC
VCC
FBC2 13
28 ENRX
ENRX
C9
TH71111
LF
12
FBC1
29
30
31
32
C10
R2
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. 4: Test circuit for FM reception
Circuit Features
• Tolerates input frequency variations
• Applicable for FM
39010 71111
Rev. 013
Page 16 of 22
Data Sheet
June/07
MELEXIS [ Melexis Microelectronic Systems ]
