TFS248K Datasheet, PDF (1/5 Pages) Vectron International, Inc – Filter Specification

tfs248K.doc
VI TELEFILTER
version 1.2
Filter Specification
08.01.2004
TFS 248 K
1/5
Measurement condition
Ambient temperature:
23 C
Input power level:
0 dBm
Terminating impedances*): for input: 980
for output: 940
// -5,2 pF
// -5,3 pF
Characteristics
Remark:
The maximun of the pass band attenuation amax 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 248 MHz without tolerance. The
given values for the absolute attenuation aabs and for the group delay ripple have to be reached 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
4,1 dB
max.
7 dB
Nominal Frequency
Centre Frequency
Pass band
fN
-
fC
248,5 MHz
PB
248,5 MHz
-
fN
0,2 MHz
Absolute Attenuation
fN
... fN ±
fN ±
fN ±
fN ±
1 MHz ... fN ±
2 MHz ... fN ±
21,4 MHz ... fN ±
aabs
200 kHz
2 MHz
21,4 MHz
50 MHz
4,5 dB
25
dB
42
dB
65
dB
max.
min.
min.
min.
7 dB
15 dB
35 dB
50 dB
Group Delay Ripple within PB
0,04 µs
max.
0,5 µs
Operating Temperature Range
OTR
-
- 20 °C ... + 70 °C
Storage Temperature Range
-
- 40 °C ... + 85 °C
Frequency Inversion Temperature
20
°C
-
Temperature Coefficient of Frequency
TCf **
- 0,04 ppm/k²
-
*) 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)² x fTo(MHz).
Generated:
Checked / Approved:
TELEFILTER GmbH
Potsdamer Straße 18
D 14 513 TELTOW / Germany
Tel: [phone] / Fax: [phone]
E-Mail: [e-mail]
VI TELEFILTER reserves the right to make changes to the product(s) and/or information contained herein without notice. No liability is
assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.