B3555 Просмотр технического описания (PDF) - EPCOS AG
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B3555 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)
B3555
433,92 MHz
TA = 25 ˚C
ZS = 50 Ω and matching network
ZL = 50 Ω and matching network
min.
typ.
max.
fC
—
433,96
— MHz
Minimum insertion attenuation
αmin
433,80 ... 434,12 MHz
—
2,2
4,0 dB
Pass band (relative to αmin)
433,715 ... 434,205 MHz
433,675 ... 434,245 MHz
433,615 ... 434,305 MHz
—
1,0
2,0 dB
—
1,0
3,0 dB
—
2,0
6,0 dB
Relative attenuation (relative to αmin)
αrel
10,00 ... 400,00 MHz
40
50
— dB
400,00 ... 429,10 MHz
38
45
— dB
429,10 ... 430,70 MHz
20
30
— dB
430,70 ... 432,00 MHz
35
45
— dB
435,30 ... 436,80 MHz
15
25
— dB
436,80 ... 438,40 MHz
8
13
— dB
438,40 ... 450,00 MHz
24
32
— dB
450,00 ... 600,00 MHz
38
48
— 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
— 225 || 3,4 — Ω || pF
—
225 || 3,4
— 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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