TFS238A Datasheet, PDF (1/5 Pages) Vectron International, Inc – Preliminary Specification

TFS 238a.doc
VI TELEFILTER
Measurement condition
Ambient temperature TA:
Input power level:
Terminating impedances at fc*:
Preliminary Specification
25 °C
0 dBm
input: 1000
output: 670
// - 7,2 pF
// - 7,8 pF
version 1.1
TFS 238 A
10.04.2003
1/5
Characteristics
Remark:
Reference level for the relative attenuation arel of the TFS 238A is the insertion loss. 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 temperature coefficient of frequency Tcf is valid both for the reference frequency fc and the frequency response
of the filter in the operating temperature range.
Data
Insertion loss
ae
(reference level at ambient temperature)
Nominal frequency
fN
Centre frequency
fc
Passband Ripple (p-p) f_N 500 kHz
Relative attenuation
fN
.........
fN ± 0,5 MHz .........
fN ±
fN ±
fN -
fN +
0,9 MHz .........
1,25 MHz .........
4 MHz .........
4 MHz .........
arel
fN ± 0,5 MHz
fN ± 0,615 MHz
fN ± 1,25
fN ± 4
fN - 228,4
fN + 111,6
MHz
MHz
MHz
MHz
Phase variation within fN 630 kHz
typ. value
9,5 dB
-
238,4
MHz
0,4 dB
0,4 dB
1
dB
25
dB
35
dB
55
dB
60
dB
1,2 deg rms
tolerance / limit
min.
max.
8,9 dB
10,9 dB
238,4 MHz
-
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
Triple transit response suppression
27
dB
min. 20 dB
Operating temperature range
Storage temperature range
Temperature coefficient of frequency
Frequency inversion temperature
TCf ***
T0
-
-
-0,036 ppm/K²
35
°C
- 20 °C.... + 85 °C
- 55 °C.... + 125 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.
**) 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:
TELEFILTER GmbH
Potsdamer Straße 18
D 14 513 TELTOW / Germany
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