TFS448 Datasheet, PDF (1/5 Pages) Vectron International, Inc – Filter Specification

Filename: 448.doc
VI TELEFILTER
version 1.1
Filter Specification
TFS 448
16.05.2002
1/5
Measurement condition
Ambient temperature:
Input power level:
Terminating impedances *
Input:
Output:
23 °C
0 dBm
340 Ω || -1,05 pF
340 Ω || -1,05 pF
Characteristics
Remark:
Reference level for the relative attenuation arel of the TFS448 is the maximum of the pass band attenuation amax. The maximum of the
attenuation within the usable signal bandwidth is defined as the insertion loss ae. The centre frequency fc is the arithmetic mean value of the
upper and lower frequencies at the 3 dB filter attenuation level relative to the insertion loss ae. The nominal frequency fN is fixed at 448,0125
MHz without tolerance. The given values for the relative attenuation have to be reached at the frequencies given below even if the centre
frequency fc is shifted due to the temperature coefficient of frequency TCf in the operating temperature range and due to a production tolerance
for the centre frequency fc.
Data
typ. value
Variation / Limitation
Insertion loss
(Reference level)
ae = amax
-
max. 5
dB
Nominal frequency
Centre frequency
3 dB - bandwidth
f_N
-
f_c
448,02 MHz
BW
255 kHz
448,0125 MHz
-
-
Usable signal bandwidth
Relative attenuation
f_N + 910 kHz
Temperature coefficient of frequency
Frequency inversion temperature
Operating temperature range
Storage temperature range
arel
TC_f **
T₀
-
60 dB
-0,036 ppm/K²
+10 °C
-
-
min. f_N ± 10 kHz
min. 52
dB
-
-
- 10°C ... + 50°C
- 30°C ... + 85°C
*) The terminating impedances depend on parasitics and q-values of matching elements and the board used, and are to be understood as
reference values only. Should there be additional questions do not hesitate to ask for an application note or contact our design team.
**) ∆f(Hz) = TCf(ppm/K²) x (T-T₀)² x fTo(MHz)
generated:
checked / approved:
VI TELEFILTER
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D 14 513 TELTOW / Germany
Tel: [phone] / Fax: [phone]
598-0075
Vectron International, Inc.
267 Lowell Road
Hudson, NH 03051 / USA
Tel: [phone] Fax: (603)
E-Mail: [e-mail]
E-Mail: [e-mail]
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