3 Mar 13, 2003
SAW Components B3750
433,92 MHzLow-loss Filter
Data Sheet
Characteristics
Reference temperature:
T
A
= –40 ... +95˚C
Terminating source impedance:
Z
S
= 50 Ω and matching network
Terminating load impedance:
Z
L
= 50 Ω and matching network
2)
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.
min. typ. max.
Center frequency
f
C
— 433,92 — MHz
(center frequency between 3 dB points)
Minimum insertion attenuation α
min
(including losses in matching network)
433,76 ... 434,08 MHz — 2,0 3,0 dB
Pass band (relative to α
min
)
433,76 ... 434,08 MHz — 0,5 2,0 dB
433,74 ... 434,10 MHz — 0,7 3,0 dB
433,70 ... 434,14 MHz — 1,0 6,0 dB
Pass bandwidth
α
rel
≤ 3 dB 0,64 0,70 0,76 MHz
Relative attenuation (relative to α
min
) α
rel
10,00 ... 414,00 MHz 55 62 — dB
414,00 ... 424,50 MHz 48 55 — dB
424,50 ... 431,72 MHz 31 35 — dB
431,72 ... 432,12 MHz 39 44 — dB
432,12 ... 433,10 MHz 8 11 — dB
434,92 ... 442,00 MHz 10 14 — dB
442,00 ... 550,00 MHz 36 44 — dB
550,00 ... 700,00 MHz 55 60 — dB
700,00 ... 805,00 MHz 40 45 — dB
805,00 ...1000,00 MHz 60 70 — dB
Impedance for pass band matching
2)
Input:
Z
IN
=
R
IN
||
C
IN
— 310 || 2,2 — Ω || pF
Output:
Z
OUT
=
R
OUT
||
C
OUT
—
310 || 2,2
— Ω || pF
