TFS248C Datasheet, PDF (1/5 Pages) Vectron International, Inc – Filter specification

Filename: tfs 248c.doc
VI TELEFILTER
Measurement condition
Ambient temperature:
Input power level:
Terminating impedance: *
Input:
Output:
Version 1.4
Filter specification
23
°C
0
dBm
63 Ω || -1,65 pF
63 Ω || -0,42 pF
TFS 248C
06.08.2004
1/5
Characteristics
Remark:
The reference level for the relative attenuation arel of the TFS 248C is the minimum of the pass band attenuation amin. The minimum of the pass band
attenuation amin is defined as the insertion loss ae. The centre frequency fc is the arithmetic mean value of the upper and lower frequencies at the 3,0 dB
filter attenuation level relative to the insertion loss ae. The nominal frequency fN is fixed at 248,6 MHz without any tolerance. The given values for both the
relative attenuation arel and the group delay ripple have to be achieved 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
(reference level)
Nominal Frequency
Centre Frequency
3 dB Band width
ae = amin
fN
fC
typ. Value
1,9 dB
-
248,6 MHz
6,6 MHz
Tolerance / Limit
3,5 dB
248,6 MHz
-
5,0 MHz
Pass Band Ripple fN ± 120 kHz
Relative Attenuation
arel
0,05 dB
0,5 dB
fN – 248,5 MHz
fN + 10 MHz
fN + 21 MHz
... fN – 12 MHz
... fN + 21 MHz
... fN + 251,4 MHz
Group Delay GD
Group Delay Ripple fN ± 120 kHz
Input Power Level
35-80 dB
18-40 dB
40-60 dB
150 ns
10 ns
min. 25 dB
min. 10 dB
min 25 dB
max. 300
max. 100
max. 12
ns
ns
dBm
Operating Temperature Range
Storage Temperature Range
Temperature Coefficient
-
-
–36 ppm/K
- 25 °C ... + 75 °C
- 40 °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/K) x (T-T₀) x fTo(MHz).
Generated:
Checked / Approved:
Tele Filter GmbH
Potsdamer Straße 18
D 14 513 TELTOW / Germany
Tel: [phone] / Fax: [phone]
E-Mail: [e-mail]
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