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TH7111
868/915MHz
FSK/FM/ASK Receiver
TH7111 Data Sheet
Page 13 of 20
Nov. 2001
3901007111
Rev. 005
FSK Circuit with AFC and Ceramic Resonator Tolerance Compensation
Fig. 3: Test circuit for FSK with AFC and resonator compensation
Circuit Feature
! Improves input frequency acceptance range up to RF
nom
±50 kHz
! Eliminates calibration tolerances of ceramic resonator
! Eliminates temperature tolerances of ceramic resonator
! Non-inverted and inverted CMOS-compatible outputs
OUT_MIX2
VEE
VEE
LF1
ENRX
LQFP44
VCC
RO
VEE
LF2
VEE
FBC1
IN_IFA
FBC2
VCC
VCC
VCC
IN_LNA
OUT_IFA
IN_DEM
SW_MIX2
IN_MIX2
ENRO
VCC
VCC
VCC
VCC
R1 C3
XTAL
VCC
C4
L1
L2
C5
C6
L3
C11
C12
C10
L5
L4
C9
CERFIL
C8
VCC
R4
R5
R3
C15
C17
C16
C19
C18
C7
C1
C13
C14
CERRES
CB*
VCC
CP
VD