TFS77A Datasheet, PDF (1/5 Pages) Vectron International, Inc – Filter specification

Filename: tfs 77a.doc
VI TELEFILTER
Version 1.1
Filter specification
TFS 77A
22.11.2004
1/5
Measurement condition
Ambient temperature:
Input power level:
Terminating impedance: *
Input:
Output:
25
°C
0
dBm
910 Ω || -22.8 pF
760 Ω || -24.0 pF
Characteristics
Remark:
The reference level for the relative attenuation arel of the TFS 77A 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 1 dB
filter attenuation level relative to the insertion loss ae. The nominal frequency fN is fixed at 77,55 MHz without any tolerance. The given values for the
relative attenuation arel 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
typ. value
tolerance / limit
Insertion loss
(reference level)
ae
7,7 dB
-
max.
10,0 dB
Nominal frequency
Centre frequency
Passband
f_N
-
f_C
77,55 MHz
PB
-
77,55 MHz
-
f_C
± 12,5 kHz
Amplitude ripple in PB
p-p
0,4 dB
max.
1 dB
Relative attenuation
f_N -
50
f_N + 25
MHz ... f_N - 25
MHz ... f_N + 50
Absolute group delay in PB
arel
MHz
MHz
70
dB
52
dB
615
ns
min.
min.
max.
50 dB
50 dB
0,8 µs
Group delay ripple in PB
p-p
12
ns
max.
20 ns
Operating temperature range
OTR
-
-25 °C ... + 55 °C
Storage temperature range
-
-35 °C ... + 85 °C
Temperature coefficient of frequency
TCf **
-22
ppm/K
-
*) 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.
**) ∆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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