X7251D Datasheet, PDF (4/9 Pages) EPCOS – SAW Components Bandpass Filter

SAW Components
Bandpass Filter
Data Sheet
Characteristics of channel 2 (switching pin 2 connected to pin 1)
Reference temperature:
Terminating source impedance:
Terminating load impedance:
T_A = 25 ˚C
Z_S = 50 Ω
Z_L = 2 kΩ || 3 pF
Insertion attenuation
Reference level for the
following data
α
36,17 MHz
min.
19,5
typ.
21,0
X 7251 D
36,17 MHz
max.
22,5 dB
Pass bandwidth
α_rel < 1,5 dB
α_rel < 3 dB
α_rel < 15 dB
α_rel < 30 dB
B_1,5dB
B_3dB
B_15dB
B_30dB
Relative attenuation
α_rel
Lower sidelobe
Upper sidelobe
25,00 ... 31,55 MHz
40,75 ... 45,00 MHz
Reflected wave signal suppression
1,1 µs ... 6,0 µs after main pulse
(test pulse 250 ns,
carrier frequency 36,17 MHz)
Feedthrough signal suppression
1,3 µs ... 1,2 µs before main pulse
(test pulse 250 ns,
carrier frequency 36,17 MHz)
Group delay ripple (p-p)
∆τ
32,75 ... 39,55 MHz
Impedance at 36,17 MHz
Input: Z_IN = R_IN || C_IN
Output: Z_OUT = R_OUT || C_OUT
Temperature coefficient of frequency
TC_f
6,4
6,7
6,7
7,0
7,7
8,0
7,9
8,5
35,0
41,0
33,0
38,0
42,0
50,0
—
50,0
—
50
— 1,5 ||20,9
—
2,4 || 4,3
—
–72
7,0 MHz
7,3 MHz
8,3 MHz
9,1 MHz
dB
dB
— dB
— dB
— ns
— kΩ || pF
— kΩ || pF
— ppm/K
4 Dec 08, 2003