Remark: Reference level for the relative attenuation arel of the TFS149C 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
28 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 bandwidth shift of the filter in the operating temperature range is included in the
production tolerance scheme.
Data
typ. value
tolerance / limit
Insertion loss
(reference level)
Centre frequency
at ambient temperature T
A
Pass band
Pass band ripple ( p–p ) :
Bandwidth
within operating temperature range
1,2 dB
3
dB
28
43
48
dB
dB
dB
ae = amin
25
149,9
-
0,7
dB
MHz
max.
26
dB
MHz
MHz
dB
fc
PB
149,9 ± 0,1
f
C
± 7,1
1,2
dB
max.
-
-
-
-
-
arel
7,05 MHz
7,2 MHz
7,9
8,5
11
22,9
14
13
8,5
7,8
7,6
95
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
0,7
2,5
38
50
45
51
53
44
50
45
35
60
2,9
150
Tc
f
- 81
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
µs
ns
ppm/K
min.
min.
max.
max.
max.
14,1
14,4
15,2
15,3
17
MHz
MHz
MHz
MHz
MHz
Relative attenuation
f
C
... f
C
±
f
C
± 7,05 MHz ... f
C
±
f
C
+ 7,6
f
C
+ 7,9
f
C
+ 8,5
f
C
+11
f
C
- 22,9
f
C
- 14
f
C
- 13
f
C
- 8,5
f
C
- 7,8
f
C
±22,9
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
...
...
...
...
...
...
...
...
...
...
f
C
+
f
C
+
f
C
+
f
C
+
f
C
-
f
C
-
f
C
-
f
C
-
f
C
-
f
C
±
max.
max.
min.
min.
min.
min.
min.
min.
min.
min.
min.
min.
1,2
3
28
43
40
48
48
42
48
43
28
50
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
µs
ns
Group delay ( mean value in PB )
Group delay ripple in PB:
Temperature coefficient of frequency
Frequency deviation of fc over temperature
Operating temperature range
Storage temperature range
max.
4
max. 200
-
∆f
c(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 parasites 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:
checked / approved:
Tele Filter GmbH
Potsdamer Straße 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.
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