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SAW Components
SAW filter
Data sheet
Characteristics
Temperature range for specification:
Terminating source impedance:
Terminating load impedance:
T A = –40 ?C to +95 ?C
Z S = 50 ? and matching network
Z L = 50 ? and matching network
B3769
314.85 MHz
min.
typ.
@ 25 ?C
max.
Center frequency
f C
—
314.85
—
MHz
(center frequency between 3 dB points)
Minimum insertion attenuation
α min
incl. loss in matching elements
excl. loss in matching elements
—
—
1.9
1.3
2.9
2.3
dB
dB
Pass band (relative to α min )
314.70 ... 315.00 MHz
314.67 ... 315.03 MHz
314.63 ... 315.07 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 ... 294.35 MHz
294.35 ... 304.35 MHz
304.35 ... 312.65 MHz
312.65 ... 313.05 MHz
313.05 ... 314.15 MHz
48
45
25
33
13
53
50
30
40
18
—
—
—
—
—
dB
dB
dB
dB
dB
315.55
322.85
335.00
600.00
1000.00
...
...
...
...
...
322.85
335.00
600.00
1000.00
2500.00
MHz
MHz
MHz
MHz
MHz
13
38
43
60
40
17
45
48
70
45
—
—
—
—
—
dB
dB
dB
dB
dB
Impedance for pass band matching 1)
Input: Z IN
= R IN
|| C IN
—
350 || 2.7
—
? || pF
Output: Z OUT = R OUT || C OUT
—
350 || 2.7
—
? || 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 removal of the SAW filter the input impedance of the input and output match-
ing network is calculated. The conjugate complex value of these characteristic impedances are the input and
output impedances for flat passband. For more details we refer to EPCOS application note #4.
Please read cautions and warnings and
important notes at the end of this document.
3
December 21, 2012
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