Filename: tfs 280k.doc

Version 1.1

04.05.2004

Filter specification

TFS 280K

1/5

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

Measurement condition

Ambient temperature:

22

°C

Input power level:

0

dBm

Terminating impedance: *

Input:

268 Ω || -9.2 pF

Output:

220 Ω || -9.7 pF

Characteristics

Remark:

The reference level for the relative attenuation arel of the TFS280K 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 280 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

typ. value

tolerance / limit

Insertion Loss

ae

12.4

dB

max.

13

dB

Nominal Frequency

280

MHz

Centre Frequency

280

MHz

-

Relative Attenuation

arel

5

MHz

1

dB

max.

3

dB

9,6 MHz

40

dB

min.

16

dB

10,0 MHz

45

dB

min.

25

dB

100,0 MHz

44

dB

min.

40

dB

Group Delay Ripple

5

MHz

34

ns

max.

75

ns

Operating Temperature Range

OTR

- 40°C ... + 85°C

Storage Temperature Range

- 40°C ... + 85°C

Temperature Coefficient of Frequency

- 18

ppm/K

-

Input Power Level

-

max.

10

dBm

values only. Should there be additional questions do not hesitate to ask for an application note or contact our design team.

Generated:

Checked / Approved:

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.