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P61E7.pdf 01.10.17
Lead Type CERAFILr Test Circuit and Characteristics Data
■ Test Circuit
(1) : Input
(2) : Output
(3) :Ground
(1) (2) (3)
R1
RF
Voltmeter
Rg
C
R2
S.S.G
Rg + R1 = R2 = 330Ω
C = 10pF (Including stray capacitance and input
capacitance of RF voltmeter.)
■ Temperature Characteristics
W40
W20
0
W40
W20
0
SFELA10M7GA00-B0
SFELA10M7HA00-B0
Center frequency
Center frequency
Y20
Y40
Y20
Y40
Y20
0
0
0
W20
W40
W40
W40
W60
W60
W60
W80
W80
W80
Y20
0
0
0
W20
W40
W40
W40
W60
W60
W60
W80
W80
W80
Temperature (˚C)
Temperature (˚C)
W2
W1
0
W2
W1
0
Insertion loss
Insertion loss
Y1
Y2
Y1
Y2
Y20
W20
Y20
W20
Temperature (˚C)
Temperature (˚C)
W40
W20
0
W40
W20
0
3dB Band width
3dB Band width
Y20
Y40
Y20
Y40
Y20
W20
Y20
W20
Temperature (˚C)
Temperature (˚C)
■ Matching Conditions
•When using ceramic filters, it is most important to
•The SFELA10M7 and SFTLA10M7 series are of
input/output symmetric structure so that in theory
there is no input/output directionality. Actual
circuits may use different input/output loading
conditions (for example, mismatched impedance) or
capacitance load. In such cases, the waveform will
be a little changed by the direction of the
10
match the input/output load to impedance 330 ohm
(only SFELA10M7DF00-B0 is 470 ohm matching).
Waveform symmetry is damaged when reactance
is added to the input/output load.
•Two ceramic filters directly connected can be used
for high selelctivity. For reducing waveform
variation, it is recommended to input a buffer AMP
between ceramic filters.
input/output of the ceramic filters.
36
MURATA [ muRata ]
