3 January 08, 2013
B3741
315.00 MHz
SAW Components
SAW filter
Data sheet
Please read
cautions and warnings and
important notes
at the end of this document.
Characteristics
Temperature range for specification: T = –45 ˚C to +95 ˚C
Terminating source impedance: Z
S
=50Ω and matching network
Terminating load impedance: Z
L
=50Ω and matching network
min. typ.
@ 25 ˚C
max.
Center frequency f
C
— 315.00 — MHz
Minimum insertion attenuation α
min
incl. loss in matching elements (Q
L
= 42) — 2.1 2.8 dB
excl. loss in matching elements — 1.2 1.9 dB
Pass band (relative to α
min
)
314.85 ... 315.15 MHz — 0.5 2.0 dB
314.82 ... 315.18 MHz — 0.8 3.0 dB
Relative attenuation (relative to α
min
) α
rel
10.00 ... 280.00 MHz 50 55 — dB
280.00 ... 308.00 MHz 45 49 — dB
308.00 ... 313.20 MHz 34 39 — dB
313.20 ... 314.10 MHz 16 20 — dB
315.90 ... 316.50 MHz 16 20 — dB
316.50 ... 325.00 MHz 25 30 — dB
325.00 ... 335.00 MHz 36 40 — dB
335.00 ... 380.00 MHz 43 48 — dB
380.00 ... 600.00 MHz 50 55 — dB
600.00 ... 1500.00 MHz 60 65 — dB
1500.00 ... 2500.00 MHz 50 55 — dB
Impedance for pass band matching
1)
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 #18.
Input: Z
IN
=R
IN
|| C
IN
— 490 || 2.8 — Ω || pF
Output: Z
OUT
=R
OUT
|| C
OUT
—
490 || 2.8
— Ω || pF
