TFS238 Datasheet, PDF (1/5 Pages) Vectron International, Inc – Filter Specification

TFS 238.doc
VI TELEFILTER
Filter Specification
version 2.1
TFS 238
05.09.2003
1/5
Measurement condition
Ambient temperature TA:
Input power level:
Terminating impedances at fc *:
23 °C
0 dBm
input: 450
output: 430
// -8,3 pF
// -7,3 pF
Characteristics
Remark:
The reference level for the relative attenuation arel of TFS238 is the minimum of the pass band attenuation amin. This value is defined as the
insertion loss ae. The centre frequency fc is the arithmetic mean value of the upper and lower frequencies at the 1 dB filter attenuation level relative
to the insertion loss ae. The given values for the relative attenuation arel and the group delay ripple 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
Insertion loss
ae
(reference level)
typ. value
9,8 dB
tolerance / limit
max. 12 dB
Nominal frequency
fN
Centre frequency
fc
Relative attenuation
fN
.........
fN ± 5
fN ± 7,5
fN ± 9
fN ± 10
MHz .........
MHz .........
MHz .........
MHz .........
arel
fN ± 2,5 MHz
fN ± 7,5 MHz
fN ± 9 MHz
fN ± 10 MHz
fN ± 100 MHz
Phase variation within fN 2,5 MHz
Temperature coefficient of frequency ( Tcf )**
Frequency deviation of fc over temperature T:
Operating temperature range
Storage temperature range
-
238,5 MHz
238,5 MHz
-
0,4 dB
23 dB
38 dB
50 dB
60 dB
max.
min.
min.
min.
min.
1 dB
13 dB
23 dB
40 dB
47 dB
1,1 deg rms
max.
4 deg rms
-18 ppm/K
-
fc(Hz) = Tcf(ppm/K) x (T - TA) x fCAT (MHz)
-
- 20 °C .... + 85 °C
-
- 40 °C .... + 85 C
Input power
-
max. 20 dBm
*) 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.
generated:
checked / approved:
TELEFILTER GmbH
Potsdamer Straße 18
D 14 513 TELTOW / Germany
Tel: [phone] / Fax: [phone]
E-Mail: [e-mail]
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