鈩?/div>
// -5,7 pF
Characteristics
Remark:
The reference level for the relative attenuation arel of TFS 225E 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
ae = amin
typ. value
6,5
dB
limit
min.
max.
4,5 dB
8
dB
225
MHz
Nominal frequency
Centre frequency
Relative attenuation
f
N
-
f
N
鹵
f
N
鹵
f
N
+
f
N
+
0,2 MHz ... f
N
+
0,6
1,2
1
1,8
7
kHz
MHz
MHz
MHz
MHz
... f
N
鹵
... f
N
鹵
... f
N
-
... f
N
+
...
fN
fc
arel
-
225
MHz
-
0,2 MHz
1,2
1,8
1,8
7
1
MHz
MHz
MHz
MHz
GHz
0,5
15
27
35
35
52
85
-
-
dB
dB
dB
dB
dB
dB
ns
max.
min.
min.
min.
min.
min.
1
8
20
30
30
45
dB
dB
dB
dB
dB
dB
ns
Group delay ripple
in f
N
- 200 kHz ... f
N
+ 200 kHz
Operating temperature range
Storage temperature range
Temperature coefficient
Frequency inversion temperature
Input power level
TC
**
T
0
max. 350
- 20
擄C...+
80
擄C
- 35
擄C..
+ 85
擄C
-
-
max. + 10
dBm
擄C
- 0,04 ppm/K虜
35
-
*) 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
**)
鈭唂(Hz)
= TCf(ppm/K) x (T-T
0
)虜 x fTo(MHz)
generated:
checked / approved:
TELEFILTER GmbH
Potsdamer Stra脽e 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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