TFS238A_06 Datasheet, PDF (1/5 Pages) Vectron International, Inc – Filter specification

Filename: tfs 238a.doc
VI TELEFILTER
Version 1.2
Filter specification
Measurement condition
Ambient temperature:
Input power level:
Terminating impedance: *
Input:
Output:
25
°C
0
dBm
1000 Ω || -7.2 pF
670 Ω || -7,8 pF
TFS 238A
13.10.2006
1/5
Characteristics
Remark:
The reference level for the relative attenuation arel of the TFS 238A 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 dB
filter attenuation level relative to the insertion loss ae. The nominal frequency fN is fixed at 238,4 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
ae
(reference level at ambient temperature)
Nominal frequency
f_N
Centre frequency
f_C
Passband
PB
Pass band ripple
(p-p)
Relative attenuation
f_N
f_N ±
f_N ±
f_N ±
f_N -
f_N +
0,5
0,9
1,25
4
4
… f_N ±
MHz … f_N ±
MHz … f_N ±
MHz … f_N ±
MHz … f_N -
MHz … f_N +
arel
0,5 MHz
0,615 MHz
1,25 MHz
4
MHz
228,4 MHz
111,6 MHz
Phase variation within f_N ± 630 kHz
Triple transit response suppression
Input power level
Operating temperature range
Storage temperature range
Frequency inversion temperature
Temperature coefficient of frequency
OTR
TCf ***
typ. value
9,5 dB
-
238,4
-
0,4
MHz
dB
0,4 dB
1
dB
25
dB
35
dB
55
dB
60
dB
1,2 deg rms
27
dB
-
-
-
35
-0,036
°C
ppm/K²
tolerance / limit
min.
max.
8,9
10,9
238,4
-
dB
dB
MHz
f_N ± 500 kHz
max.
1 dB
max.
max.
min.
min.
min.
min.
1 dB
5 dB
20 dB
30 dB
47 dB
47 dB
max.
4 deg rms
min.
20 dB
max.
20 dBm**
- 20 °C ... + 85 °C
- 55 °C ... +125 °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.
**) This power level is allowed for short term operation (10% of life time) only, the max. input power for continuous operation is 15 dBm
***) ∆f(Hz) = TCf(ppm/K²) x (T-T₀)² 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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assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.