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SAW Components
Low-loss Filter
Data Sheet
Characteristics
Reference temperature:
Terminating source impedance:
Terminating load impedance:
T A = –45 ... +95?C
Z S = 50 ? and matching network
Z L = 50 ? and matching network
B3763
315,15 MHz
min.
typ.
max.
Center frequency
f C
—
315,15
—
MHz
(center frequency between 3 dB points)
Minimum insertion attenuation
(including losses in matching network)
α min
315,00 ... 315,30 MHz
—
1,9
2,9
dB
Pass band (relative to α min )
315,00 ... 315,30 MHz
314,97 ... 315,33 MHz
314,93 ... 315,37 MHz
—
—
—
0,5
0,7
1,0
2,0
3,0
6,0
dB
dB
dB
Pass bandwidth
α rel ≤ 3 dB
0,54
0,59
0,64
MHz
Relative attenuation (relative to α min )
α rel
10,00 ... 294,65
294,65 ... 304,65
304,65 ... 312,95
312,95 ... 313,35
313,35 ... 314,45
MHz
MHz
MHz
MHz
MHz
48
45
25
33
13
53
50
30
40
18
—
—
—
—
—
dB
dB
dB
dB
dB
315,85
323,15
335,00
600,00
... 323,15
... 335,00
... 600,00
...1000,00
MHz
MHz
MHz
MHz
13
38
43
60
17
45
48
70
—
—
—
—
dB
dB
dB
dB
Impedance for pass band matching 1)
Input:
Z IN
= R IN
|| C IN
—
340 || 2,6
—
? || pF
Output: Z OUT = R OUT || C OUT
—
340 || 2,6
—
? || pF
1)
Impedance for passband matching bases on an ideal, perfect matching of the SAW filter to
source- and to load impedance (here 50 Ohm). After the SAW filter is removed and input imped-
ance into the input matching / output matching network is calculated.
The conjugate complex value of these characteristic impedances are the input and output imped-
ances for flat passband. For more details, we refer to EPCOS application note #4.
3
Jan 09, 2004
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