Philips CEM2000/00, Service Manual

Page: 69 / 72

TDA7703/TDA7703R
9.2 AM IF-processing
9.1.1 Channel selection filter
Range
Symbol Parameter Test Condition, Comments
Min Typ Max
Units
CSF BW Channel selection filter BW response: - 3dB - ±3.7 - kHz
9.2.1 Soft mute
(continuous set)
Range
Symbol Parameter Test Condition, Comments
Min Typ Max
Units
SMsp Start point vs. field strength
audio atten = 1 dB
read “FM_softmute”
no adjacent channel present
0 25 40 dBu
SMep End point vs. field strength
audio atten = SMd + 1 dB
read “FM_softmute”
no adjacent channel present
0 0 30 dBu
SMd Depth -40 -24 0 dB
SMtauatt
Transition time for field
strength-dependent soft mute
activation
0.001 0.1 10 s
SMtaurel
Transition time for field
strength-dependent soft mute
release
0.001 3 10 s
9.2.2 High cut control
(continuous set)
Range
Symbol Parameter Test Condition, Comments
Min Typ Max
Units
HCFSsp Start point vs. field strength
minimum RF level for widest
HC filter (filter # 7)
no multipath present
0 40 50 dBu
HCFSep End point vs. field strength
maximum RF level for
narrowest HC filter (filter # 0)
no multipath present
0 30 50 dBu
HCFStW2N
Field strength-related
transition time from wide to
narrow band
Vrf step-like variation from 60
dBu to 10 dBu
0.001 0.2 20 s
HCFStN2W
Field strength-related
transition time from narrow to
wide band
Vrf step-like variation from 0
dBu to 60 dBu
0.001 10 20 s
HCmaxBW
Maximum cut-off frequency of
high cut filter bank
Filter #7, -3 dB response
frequency, input signal with
pre-emphasis
HCmin
BW
TBD TBD kHz
HCminBW
Minimum cut-off frequency of
high cut filter bank
Filter #0, -3 dB response
frequency, input signal with
pre-emphasis
TBD TBD
HCma
xBW
kHz
HCnumFilt Number of discrete HC filters - - 8 - -
Rev. 1.0 19/22