TFS321 Datasheet, PDF (1/5 Pages) Vectron International, Inc – Filter Specification

Tfs321.doc
VI TELEFILTER
version 1.3
Filter Specification
TFS 321
30.07.2001
1/5
Measurement condition
Ambient temperature:
23 °C
Input power level:
0 dBm
Terminating impedances *
input:
490 Ohm // –1.6 pF
output:
490 Ohm // –1.6 pF
External coil: 175 nH
Characteristics
Remark:
Reference level for the relative attenuation arel of the TFS 321 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 on 321,4 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 also 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 = amin
-
max.
6,5 dB
Nominal frequency
fN
Centre frequency
fC
Usable signal bandwidth
3 dB bandwidth
BW
-
321,41
-
-
321,400 MHz
min. 140
kHz
min. 280
kHz
Relative attenuation
arel
fN ± 400 kHz
fN ± 400 kHz ... fN ± 600 kHz
fN ± 600 kHz ... fN ± 13 MHz
Group delay ripple
GD
fN ± 70 kHz
Input power level
-
min. 15
dB
-
min. 27
dB
-
min. 35
dB
-
max.
2
µs
-
max. 13
dBm
Operating temperature range
-20 °C ... +70 °C
Temperature coefficient of frequency TC **
-0.036
ppm/K²
Frequency inversion temperature T₀
+ 20
°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.
**) ∆f(Hz) = TCf(ppm/K²) x (T-T₀)² x fTo(MHz)
Generated:
Checked / approved:
VI TELEFILTER
Potsdamer Straße 18
D 14 513 TELTOW / Germany
Tel: [phone] / Fax: [phone]
Vectron International Inc.
267 Lowell Road
Hudson, NH 03051 / USA
Tel: [phone] Fax: [phone]
E-Mail: [e-mail]
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.