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