X7257M Datasheet, PDF (3/9 Pages) EPCOS – SAW Components Bandpass Filter

SAW Components
Bandpass Filter
Data Sheet
Characteristics of channel 1 (switching input pin 2 connected to ground)
Reference temperature:
Terminating source impedance:
Terminating load impedance:
T_A = 25 ˚C
Z_S = 50 Ω
Z_L = 2 kΩ || 3 pF
X 7257 M
36,125 MHz
Insertion attenuation
Reference level for the
following data
α
36,125 MHz
min.
typ.
max.
20,1
21,6
23,1 dB
Pass bandwidth
α_rel ≤3 dB
α_rel ≤30 dB
B_3dB
—
B_30dB
—
Relative attenuation
Lower sidelobe
Upper sidelobe
α_rel
32,32 MHz
33,93 MHz
32,13 MHz
40,13 MHz
25,00 ... 30,90 MHz
42,00 ... 45,00 MHz
– 0,2
– 0,1
—
—
34,0
33,0
8,0
9,5
1,0
1,1
2,8
3,2
42,0
39,0
— MHz
— MHz
2,2 dB
2,3 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
49,0
— 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
32,32 ... 39,93 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
—
60
— ns
—
1,6 ||16,0
— kΩ || pF
—
2,4 || 4,3
— kΩ || pF
—
–72
— ppm/K
3 Jan 12, 2005