3May 08, 2001
SAW Components X 6964 D
43,75 MHzBandpass Filter
Data Sheet
Characteristics
Reference temperature:
T
A= 25 (45) ˚C
Terminating source impedance:
Z
S= 50 Ω
Terminating load impedance:
Z
L= 2 kΩ || 3 pF
min. typ. max.
Center frequency fC43,68 43,75 43,82 MHz
(center between 3 dB points)
Insertion attenuation α
Reference level for the 43,81 (43,75) MHz 13,3 14,8 16,3 dB
following data
Pass bandwidth
αrel < 3dB B3dB — 6,0 — MHz
αrel < 30dB B30dB — 7,6 — MHz
Relative attenuation αrel
41,28 (41,22) MHz — 0,3 — dB
46,34 (46,28) MHz –0,8 0,2 1,2 dB
40,81 (40,75) MHz 1,5 2,7 3,9 dB
46,81 (46,75) MHz 1,5 2,7 3,9 dB
39,81 (39,75) MHz 38,0 53,0 — dB
47,81 (47,75) MHz 37,0 48,0 — dB
Lower sidelobe
35,06 ... 39,06 (35,00 ... 39,00) MHz 42,0 48,0 — dB
39,06 ... 39,81 (39,00 ... 39,75) MHz 37,0 46,0 — dB
Upper sidelobe
47,81 ... 50,06 (47,75 ... 50,00) MHz 36,0 41,0 — dB
50,06 ... 55,06 (50,00 ... 55,00) MHz 42,0 48,0 — dB
Reflected wave signal suppression
1,3 µs ... 6,0 µs after main pulse 42,0 52,0 — dB
(test pulse 250 ns,
carrier frequency 43,81 MHz)
Feedthrough signal suppression
1,3 µs ... 1,2 µs before main pulse 50,0 56,0 — dB
(test pulse 250 ns,
carrier frequency 43,81 MHz)
Group delay ripple (p-p) ∆τ
40,81 ... 46,81 (40,75 ... 46,75) MHz — 40 — ns
Impedance at 43,81 MHz
Input:
Z
IN =
R
IN ||
C
IN — 1,1 ||16,4 — kΩ || pF
Output:
Z
OUT =
R
OUT ||
C
OUT —1,1 || 5,0 —kΩ || pF
Temperature coefficient of frequency
TC
f— –72 — ppm/K