Filename: tfs 238c.doc

Version 1.3

20.07.2005

Filter specification

TFS 238C

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:

23

°C

Input power level:

0

dBm

Terminating impedance: *

Input:

408 Ω || -8.4 pF

Output:

395 Ω || -9.5 pF

Characteristics

Remark:

Reference level for the relative attenuation arel of the TFS 238C is the minimum of the pass band attenuation amin. The minimum of the pass band

filter attenuation level relative to the insertion loss ae. The nominal frequency fN is fixed at 238,5 MHz without tolerance. The given values for the relative

D a t a

typ. value

tolerance / limit

Insertion loss

ae = amin

9,1

dB

max.

12,0

dB

(reference level)

-

-

Nominal frequency

-

238,5

MHz

Centre frequency

238,5

MHz

Passband

PB

11,8

MHz

f

MHz

Pass band ripple **

0,2

dB

max.

1,0

dB

Relative attenuation

arel

f

N

-

100

MHz … f

N

-

20

MHz

53

dB

min.

47

dB

f

N

-

20

MHz … f

N

-

10

MHz

35

dB

min.

30

dB

f

N

-

10

MHz … f

N

-

8,5

MHz

15

dB

min.

10

dB

f

N

+

8,5

MHz … f

N

+

10

MHz

12

dB

min.

10

dB

f

N

+

10

MHz … f

N

+

20

MHz

34

dB

min.

30

dB

f

N

+

20

MHz … f

N

+

100

MHz

52

dB

min.

47

dB

Return loss

within PB

18

dB

min.

10

dB

Phase linearity

**

p-p

2.6

deg

max.

4

deg

Input power level

***

-

max.

20

dBm

Operating temperature range

OTR

-

- 20 °C ... + 85°C

Storage temperature range

-

- 45 °C ... + 85°C

Temperature coefficient of frequency

TCf ****

-22

ppm/K

*) 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.

**) Over any 4 MHz continuous bandwidth within the 10 MHz passband.

***) Maximum value for 10 years operation.

****)

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.