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TH71112
868/915MHz
FSK/ASK Receiver
4.2
4.2.1
Narrow Band FSK Reception
Narrow Band FSK Application Circuit
OUTP
RSSI
FSK output
C15
C16
C17
R4
VCC
CP
XTAL
C1
25 VEE
26 RO
16
OUT_IFA 15
C12
CERDIS
VCC
27 VCC
VCC 14
VCC
ENRX
R1
C3
28 ENRX
29 LF
30 VEE
TH71112
FBC2 13
FBC1 12
IN_IFA 11
C9
R2
C11
C10
31 IN_LNA
VEE 10
L2
C5
VCC
32 VCC
OUT_MIX2 9
CERFIL
1
2
3
4
5
6
7
8
6
1
4
3
SAWFIL
C7
C8
L1
C4
L3
CB*
VCC
50
RF input
* each Vcc pin with blocking cap of 330pF
* one global Vcc blocking cap of 33nF
Fig. 3: Test circuit for FSK reception (narrow band)
Circuit Features
?
Applicable for narrow band FSK
39010 71112
Rev. 016
Page 14 of 20
Data Sheet
Jun/12
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