TFS238C Datasheet, PDF (1/5 Pages) Vectron International, Inc – Filter specification

Filename: tfs 238c.doc
VI TELEFILTER
Version 1.3
Filter specification
Measurement condition
Ambient temperature:
Input power level:
Terminating impedance: *
Input:
Output:
23
°C
0
dBm
408 Ω || -8.4 pF
395 Ω || -9.5 pF
TFS 238C
20.07.2005
1/5
Characteristics
Remark:
Reference level for the relative attenuation arel of the TFS 238C 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 f_C is the arithmetic mean value of the upper and lower frequencies at the 1dB
filter attenuation level relative to the insertion loss ae. The nominal frequency fN is fixed at 238,5 MHz without tolerance. The given values for the relative
attenuation arel and for the group delay ripple have to be reached at the frequencies given below even if the centre frequency f_C 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 f_C.
Data
Insertion loss
(reference level)
Nominal frequency
Centre frequency
Passband
Pass band ripple **
ae = amin
f_N
f_C
PB
Relative attenuation
f-
N
f_N -
f_N -
f_N +
f_N +
f_N +
100
20
10
8,5
10
20
MHz … f -
N
MHz … f_N -
MHz … f_N -
MHz … f_N +
MHz … f_N +
MHz … f_N +
Return loss within PB
20
10
8,5
10
20
100
arel
MHz
MHz
MHz
MHz
MHz
MHz
Phase linearity **
p-p
Input power level ***
Operating temperature range
Storage temperature range
Temperature coefficient of frequency
OTR
TCf ****
typ. value
9,1 dB
-
-
238,5
MHz
11,8 MHz
0,2 dB
53
dB
35
dB
15
dB
12
dB
34
dB
52
dB
18
dB
2.6
deg
-
-
-
-22
ppm/K
tolerance / limit
max.
12,0 dB
-
238,5 MHz
max.
f ± 5,0
N
1,0
MHz
dB
min.
47 dB
min.
30 dB
min.
10 dB
min.
10 dB
min.
30 dB
min.
47 dB
min.
10 dB
max.
4 deg
max.
20 dBm
- 20 °C ... + 85°C
- 45 °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.
**) Over any 4 MHz continuous bandwidth within the 10 MHz passband.
***) Maximum value for 10 years operation.
****) ∆fc(Hz) = TC_f(ppm/K) x (T - T_o) x f_To (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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