The reference level for the relative attenuation arel of TFS238B is the minimum of the pass band attenuation amin. This value is defined as the insertion
loss ae. The centre frequency fc is the arithmetic mean value of the upper and lower frequencies at the 1 dB filter attenuation level relative to the insertion
loss ae. The given values for the relative attenuation arel and 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
Insertion loss
(reference level)
ae
typ. value
10,5 dB
tolerance / limit
max.
12
dB
Nominal frequency
Centre frequency
Relative attenuation
fN
fN
fN
fN
fN
.........
±
±
±
±
5
7,5
9
10
MHz
MHz
MHz
MHz
.........
.........
.........
.........
fN
fN
fN
fN
fN
±
fN
fc
arel
2,5 MHz
MHz
MHz
MHz
MHz
-
238,5 MHz
238,5 MHz
-
0,4 dB
23
38
50
60
dB
dB
dB
dB
max.
min.
min.
min.
min.
max.
1
13
23
40
47
4
-
dB
dB
dB
dB
dB
deg rms
±
7,5
±
9
± 10
± 100
Phase variation
within fN
±
2,5 MHz
Temperature coefficient of frequency
( Tc
f
)**
Frequency deviation of fc over temperature T:
Operating temperature range
Storage temperature range
Input power
1,1 deg rms
-18
ppm/K
∆f
c(Hz) = Tc
f
(ppm/K) x (T - T
A
) x f
CAT
(MHz)
-
-
-
- 20 °C .... + 85
- 40 °C .... + 85
max.
20
°C
°C
dBm
*)
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:
checked / approved:
TELEFILTER 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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