B3558 Просмотр технического описания (PDF) - EPCOS AG
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B3558 Datasheet PDF : 7 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)
B3558
449,10 MHz
TA = 25 ˚C
ZS = 50 Ω and matching network
ZL = 50 Ω and matching network
min.
typ.
max.
fC
—
449,14
— MHz
Minimum insertion attenuation
αmin
449,00 ... 449,28 MHz
—
2,2
3,2 dB
Pass band (relative to αmin)
448,965 ... 449,315 MHz
448,930 ... 449,350 MHz
—
0,8
3,0 dB
—
1,5
6,0 dB
Relative attenuation (relative to αmin)
αrel
10,00 ... 428,00 MHz
45
50
— dB
428,00 ... 439,00 MHz
40
45
— dB
439,00 ... 448,10 MHz
15
25
— dB
450,10 ... 459,00 MHz
15
25
— dB
459,00 ... 550,00 MHz
40
45
— dB
550,00 ... 1000,00 MHz
45
50
— 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
— 210 || 2,70 — Ω || pF
— 210 || 2,70 — Ω || pF
—
–0,03
— ppm/K2
20
—
40 °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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