SAW Components
SAW RF filter
Data sheet
Characteristics
Temperature range for specification:
Terminating source impedance:
Terminating load impedance:
T = –45 ˚C to +95 ˚C
Z
S
=
50
Ω
and matching network
Z
L
=
50
Ω
and matching network
min.
Center frequency
(center frequency between 3 dB points)
Minimum insertion attenuation
incl. loss in matching elements (Q
L
= 44)
excl. loss in matching elements
Pass band
(relative to
α
min
)
314.85 ... 315.15 MHz
314.82 ... 315.18 MHz
314.78 ... 315.22 MHz
Filter bandwidth
α
rel
≤ 3
dB
Relative attenuation
(relative to
α
min
)
α
rel
10.00 ... 294.50 MHz
294.50 ... 304.50 MHz
304.50 ... 312.80 MHz
312.80 ... 313.20 MHz
313.20 ... 314.30 MHz
315.70
323.00
335.00
600.00
...
...
...
...
323.00
335.00
600.00
1000.00
MHz
MHz
MHz
MHz
0.54
0.59
0.64
f
C
α
min
—
—
1.9
1.5
2.6
2.2
—
typ.
@ 25 ˚C
315.00
max.
—
B3761
315.00 MHz
MHz
dB
dB
—
—
—
0.5
0.7
1.0
2.0
3.0
6.0
dB
dB
dB
MHz
48
45
25
33
13
13
38
43
60
53
50
30
40
18
17
45
48
70
—
—
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
dB
dB
dB
Impedance
for pass band matching
1)
Input: Z
IN
= R
IN
|| C
IN
Output: Z
OUT
= R
OUT
|| C
OUT
1)
—
—
340 || 2.6
340 || 2.6
—
—
Ω
|| pF
Ω
|| pF
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 18, 2008
EPCOS [ EPCOS ]
