
Tfs780.doc
VI
TELEFILTER
version 1.2
21.02.2003
Filter Specification
TFS 780
1/5
Measurement condition
Ambient temperature:
Input power level:
Terminating impedances*
Characteristics
Remark:
Reference level for the relative attenuation arel of the TFS 780 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 centre 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 nominal frequency fN is fixed at 780,0 MHz without tolerance. The given
values for the relative attenuation arel and for 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.
D a t a
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.
GmbH
23
0
°
C
dBm
for input:
for output:
150
// -0,3 pF
150
// -0,3 pF
typ. value
tolerance/limit
Insertion loss
(Reference level)
ae = amin
4,0
dB
max.
5,5
dB
Nominal frequency
fN
fc
-
780,0
MHz
Centre frequency
780,0
MHz
2 dB Bandwidth
BW
49,7
MHz
min.
40,0
MHz
Pass band ripple
within
±
20,0 MHz
1,50
dB
max.
2,0** dB
Relative attenuation
f
N
.... f
N
±
20,0**
f
N
- 160,0 MHz .... f
N
- 680,0 MHz -
f
N
+ 120,0 MHz .... f
N
+ 260,0 MHz -
f
N
+ 260,0 MHz .... f
N
+ 300,0 MHz -
f
N
+ 300,0 MHz .... f
N
+ 720,0 MHz
Operating temperature range
arel
MHz
-
max.
2,0
dB
46,0
46,0
50,0
46,0
dB
dB
dB
dB
min.
min.
min.
min.
- 25
°
C ... + 75
°
C
40,0
30,0
45,0
40,0
dB
dB
dB
dB
Temperature coefficient of frequency
TC
f
***
-74
ppm/K
-
Storage temperature range
- 30 °C ... + 80 °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.
**) This parameter is guaranteed at ambient temperature (23 °C) only.
Generated:
Checked / approved: