3 May 09, 2001
SAW Components B3567
433,42 MHzLow-loss Filter
Data Sheet
Characteristics
Reference temperature:
T
A
= -20 ... 70 ˚C
Terminating source impedance:
Z
S
= 50 Ω and matching network
Terminating load impedance:
Z
L
= 50 Ω and matching network
1)
Temperature dependance of
f
C
:
f
C
(
T
A
) =
f
C
(
T
0
) (1 +
TC
f
(
T
A
-
T
0
)
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.
min. typ. max.
Center frequency
f
C
— 433,42 — MHz
(center frequency between 3 dB points)
Minimum insertion attenuation α
min
433,31 ... 433,53 MHz — 3,3 4,8 dB
(including loss in matching coils)
Amplitude ripple (p-p)
433,34 ... 433,50 MHz — 0,5 2,0 dB
433,31 ... 433,53 MHz — 1,0 3,0 dB
Relative attenuation (relative to α
min
) α
rel
10,00 ... 429,00 MHz 50 60 — dB
429,00 ... 432,62 MHz 35 45 — dB
433,92 ... 434,22 MHz 12 22 — dB
434,22 ... 434,42 MHz 32 40 — dB
434,42 ... 460,00 MHz 40 48 — dB
460,00 ...1000,00 MHz 50 58 — dB
Impedance for pass band matching
2)
Input:
Z
IN
=
R
IN
||
C
IN
— 415 || 1,6 — Ω || pF
Output:
Z
OUT
=
R
OUT
||
C
OUT
—
420 || 1,7
— Ω || pF
Temperature coefficient of frequency
1)
TC
f
— -0,03 — ppm/K
2
Frequency inversion point
T
0
10—40°C
