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SAW Components
SAW filter
Data sheet
Characteristics
Temperature range for specification:
Terminating source impedance:
Terminating load impedance:
T = –40 ?C to+105 ?C
Z S = 50 ? and matching network
Z L = 50 ? and matching network
B3783
315.00 MHz
min.
typ.
@ 25 ?C
max.
Center frequency
f C
—
315.00
—
MHz
Minimum insertion attenuation
α min
incl. loss in matching elements (Q L = 44)
excl. loss in matching elements
—
—
1.9
1.0
2.7
1.8
dB
dB
Pass band (relative to α min )
314.47 ... 315.53MHz 1)
314.45 ... 315.55MHz 2)
—
—
1.1
1.3
2.5
3.0
dB
dB
Relative attenuation (relative to α min )
α rel
10.00 ... 250.00 MHz
250.00 ... 295.00 MHz
295.00 ... 305.00 MHz
305.00 ... 313.40 MHz
316.00 ... 318.00 MHz
318.00 ... 323.00 MHz
323.00 ... 330.00 MHz
330.00 ... 340.00 MHz
340.00 ... 600.00 MHz
600.00 ... 1000.00 MHz
1000.00 ... 2500.00 MHz
50
41
35
15
7
20
30
42
45
60
35
55
46
40
20
10
25
35
47
50
65
40
—
—
—
—
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
Impedance for pass band matching 3)
Input: Z IN
= RI N
|| CI N
—
790 || 2.8
—
? || pF
Output: Z OUT = R OUT || C OUT
—
790 || 2.8
—
? || pF
1)
2)
3)
314.47 ... 315.49 MHz for extended temperature range –40 ?C to +125 ?C.
314.45 ... 315.51 MHz for extended temperature range –40 ?C to +125 ?C.
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 17, 2012
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