TFS70H28 Datasheet, PDF (1/5 Pages) Vectron International, Inc – Filter specification

File name : TFS70H28.doc
VI TELEFILTER
Filter specification
Version 1.1
TFS 70H28
04.02.2002
1/5
1. Measurement condition
Ambient temperature TA:
Input power level:
Terminating impedances at fc * ) :
Source impedance:
Load impedance:
23 °C
0 dBm.
for input:
for output:
50
50
953
1275
- 8,93 pF.
- 7,32 pF.
2. Characteristics
Remark:
Reference level for the relative attenuation arel of the TFS 70H28 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 reference 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. The frequency shift of the filter in the operating
temperature range is not included in the production tolerance scheme
Data
typical values
tolerance / limit
Insertion loss (Reference level)
ae
25 dB
max. 26 dB
Centre frequency at ambient temperature TA fc
70,01 MHz
70 ± 0,09 MHz
Pass band at ambient temperature TA:
PB
Amplitude ripple (p-p):
fC ..... fC ± 1,20 MHz
Bandwidth at ambient temperature:
1 dB
3 dB
20 dB
40 dB
45 dB
0,35 dB
2,75 MHz
3,15 MHz
4,41 MHz
4,61 MHz
4,71 MHz
fC - 1,5 MHz ... fC + 1,5 MHz
max. 0,8 dB
min. 2,50 MHz
min. 3,00 MHz
max. 4,90 MHz
Relative attenuation :
arel
fC
.... ^fC ^{± 1,25 MHz}
fC ± 1,25 MHz .... fC ± 1,50 MHz
fC ± 2,45 MHz .... fC ± 4,45 MHz
fC ± 4,45 MHz .... fC ± 30 MHz
Group delay ( mean value in PB ):
Group delay ripple in PB (p-p):
Deviation from linear phase in PB (p-p):
-
-
-
-
2,77 µs
50 ns
2,3°
max. 1 dB
max. 3 dB
min. 40 dB
min. 50 dB
max. 4,0 µs
max. 90 ns
max. 4°
Triple transit attenuation compared to main signal
54
Crosstalk
60
Substrate material
Frequency inversion temperature ( To )
Temperature coefficient of frequency ( Tcf )
Frequency deviation of fc over temperature: ** )
Operating temperature range
Storage temperature range
Quartz
20°...40° C
-0,045 ppm/K²
fc(Hz) = Tcf(ppm/K) x (T - To)² x fTo (MHz)
- 25 °C ... + 80 °C
- 40 °C ... + 85 °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.
** ) fTo is reference frequency fc at frequency inversion temperature (To )
Generated:
Dunzow W.P.
Checked/Approved:
Dr. Bert Wall
VI TELEFILTER
Potsdamer Straße 18
D 14 513 TELTOW / Germany
Tel: [phone] / Fax: [phone]
E-Mail: [e-mail]
Vectron International, Inc.
267 Lowell Road
Hudson, NH 03051 / USA
Tel: [phone] Fax: [phone]
E-Mail: [e-mail]
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