X7257M Datasheet, PDF (4/9 Pages) EPCOS – SAW Components Bandpass Filter

SAW Components
Bandpass Filter
Data Sheet
Characteristics of channel 2 (switching input 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
36,125 MHz
min.
typ.
20,5
22,0
X 7257 M
36,125 MHz
max.
23,5 dB
Pass bandwidth
α_rel ≤3 dB
α_rel ≤30 dB
B_3dB
—
B_30dB
—
Relative attenuation
Lower sidelobe
Upper sidelobe
α_rel
33,59 MHz
38,65 MHz
33,12 MHz
39,12 MHz
25,00 ... 32,00 MHz
40,40 ... 42,50 MHz
42,50 ... 45,00 MHz
– 1,2
– 1,2
—
—
34,0
27,0
33,0
6,0
7,7
0,0
0,0
2,7
2,7
40,0
33,0
39,0
— MHz
— MHz
1,2 dB
1,2 dB
— dB
— dB
— dB
— dB
— dB
Reflected wave signal suppression
1,4 µs ... 6,0 µs after main pulse
(test pulse 250 ns, carrier frequency 36,125 MHz)
40,0
50,0
— dB
Feedthrough signal suppression
1,3 µs ... 1,2 µs before main pulse
(test pulse 250 ns, carrier frequency 36,125 MHz)
—
50,0
— dB
Group delay ripple (p-p)
∆τ
33,59 ... 38,65 MHz
Impedance at 36,125 MHz
Input: Z_IN = R_IN || C_IN
Output: Z_OUT = R_OUT || C_OUT
Temperature coefficient of frequency
TC_f
—
50
— ns
—
1,6 ||17,0
— kΩ || pF
—
2,4 || 4,3
— kΩ || pF
—
–72
— ppm/K
4 Jan 12, 2005