tfs248K.doc

version 1.2

08.01.2004

Filter Specification

TFS 248 K

1/5

TELEFILTER GmbH

Potsdamer Stra

ße 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 impedances*):

for input:

980

// -5,2 pF

for output: 940

// -5,3 pF

Characteristics

Remark:

The maximun of the pass band attenuation amax 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 lossae. The nominal frequency fN is fixed at 248 MHz without tolerance. The

given values for the absolute attenuation aabs 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

4,1

dB

max.

7

dB

(reference level)

Nominal Frequency

-

248,5

MHz

Centre Frequency

248,5

MHz

-

Pass band

PB

0,2

MHz

Absolute Attenuation

aabs

±

200

kHz

4,5

dB

max.

7

dB

±

1

±

2

MHz

25

dB

min.

15

dB

±

2

±

21,4

MHz

42

dB

min.

35

dB

±

21,4

±

50

MHz

65

dB

min.

50

dB

Group Delay Ripple within PB

0,04

µs

max.

0,5

µs

Operating Temperature Range

OTR

-

- 20

°C ... + 70 °C

Storage Temperature Range

-

- 40

°C ... + 85 °C

Frequency Inversion Temperature

20

°C

-

Temperature Coefficient of Frequency

TCf **

- 0,04

ppm/k

2

-

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.