
File name: Tfs70L.doc
VI TELEFILTER
Version 5.3
TFS 70L
14.02.2002
1/5
Filter specification
VI TELEFILTER
Potsdamer Strae 18
D 14 513 TELTOW / Germany
Tel: (+49) 3328 4784-0 / Fax: (+49) 3328 4784-30
E-Mail:
tft@telefilter.com
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
Vectron International, Inc.
267 Lowell Road
Hudson, NH 03051 / USA
Tel: (603) 598-0070 Fax: (603) 598-0075
E-Mail:
vti@vtinh.com
1. Measurement condition :
Ambient temperature T
A
:
Input power level:
Terminating impedance fc * ) :
25
0
for input:
for output:
°C.
dBm.
50
33 pF.
50
0 pF.
2. Characteristics :
Remark:
Reference level for the relative attenuation
arel
of the
TFS 70L
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
Tc
f
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
typ. value
tolerance / limit
Insertion loss
(Reference level)
ae
24,5
dB
max.
27
dB
Centre frequency
fc
at ambient temperature
(f
CTA
)
70,0
MHz
70,00 ± 0,10
MHz
Pass band :
PB
fc ... fc ± 3,9
max.
MHz
Amplitude ripple in PB :
0,4
dB
1,0
dB
Bandwidth ( BW ) :
at ambient temperature T
A
1 dB
2 dB
3 dB
8,12
8,26
8,36
MHz
MHz
MHz
min.
min.
7,8
8,2
MHz
MHz
20 dB
25 dB
30 dB
8,98
9,08
9,17
MHz
MHz
MHz
max.
max.
9,0
9,2
MHz
MHz
Relative attenuation
arel
fc ..... fc ± 3,9
MHz ..... fc ± 4,1
MHz ..... fc ± 4,7
MHz ..... fc ± 6
MHz ..... fc ± 30
MHz
MHz
-
-
max.
max.
1
2
dB
dB
fc ±
fc ±
fc ±
fc ±
3,9
4,5
4,7
6
MHz
MHz
MHz
25
35
50
dB
dB
dB
min.
min.
min.
20
25
35
dB
dB
dB
Group delay ( mean value in PB ):
Group delay ripple in PB (p-p):
Deviation from linear phase in PB :
2,94
60
4° (r.m.s. 0,9 °)
μs
ns
max.
max. 100
3
μs
ns
Triple transit attenuation compared to main signal
Crosstalk
54
dB
dB
60...65
Temperature coefficient of frequency ( Tc
f
) :
Frequency deviation of fc over temperature :
Operating temperature range
Storage temperature range
- 87
ppm/K
fc(Hz) = Tc
f
(ppm/K) x (T - T
A
) x f
CTA
(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.
Generated: Dunzow W.
Checked/Approved: Dr. Bert Wall