B3558 Datasheet, PDF (3/7 Pages) EPCOS – SAW Components Low-loss Filter

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
T_A = 25 ˚C
Z_S = 50 Ω and matching network
Z_L = 50 Ω and matching network
min.
typ.
max.
f_C
—
449,14
— MHz
Minimum insertion attenuation
α_min
449,00 ... 449,28 MHz
—
2,2
3,2 dB
Pass band (relative to α_min)
448,965 ... 449,315 MHz
448,930 ... 449,350 MHz
—
0,8
3,0 dB
—
1,5
6,0 dB
Relative attenuation (relative to α_min)
α_rel
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: Z_IN = R_IN || C_IN
Output: Z_OUT = R_OUT || C_OUT
Temperature coefficient of frequency ¹⁾
TC_f
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