B3557 データシートの表示（PDF） - EPCOS AG
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B3557 Datasheet PDF : 6 Pages
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SAW Components
Low-loss Filter
Data Sheet
Characteristics
Reference temperature:
Terminating source impedance:
Terminating load impedance:
Center frequency
(center frequency between 3 dB points)
B3557
434,42 MHz
TA = 25 ˚C
ZS = 50 Ω and matching network
ZL = 50 Ω and matching network
min.
typ.
max.
fC
—
434,46
— MHz
Minimum insertion attenuation
αmin
434,30 ... 434,62 MHz
—
2,0
4,0 dB
Pass band (relative to αmin)
434,24 ... 434,68 MHz
434,18 ... 434,74 MHz
—
1,5
3,0 dB
—
2,0
6,0 dB
Relative attenuation (relative to αmin)
αrel
10,00 ... 414,50 MHz
45
50
— dB
414,50 ... 428,50 MHz
40
45
— dB
428,50 ... 433,42 MHz
15
25
— dB
435,42 ... 442,50 MHz
10
20
— dB
442,50 ... 550,00 MHz
35
40
— dB
550,00 ...1000,00 MHz
42
45
— dB
Impedance for pass band matching 2)
Input: ZIN = RIN || CIN
Output: ZOUT = ROUT || COUT
Temperature coefficient of frequency 1)
TCf
Frequency inversion point
T0
— 270 || 2,7 — Ω || pF
— 250 || 3,2 — Ω || pF
—
–0,03
— ppm/K2
—
25
— °C
1)Temperature dependence of fC: fC(TA) = fC(T0) (1 + TCf(TA – T0)2)
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.
3 May 09, 2001
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