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TFS248K Datasheet(PDF) 1 Page - Vectron International, Inc |
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TFS248K Datasheet(HTML) 1 Page - Vectron International, Inc |
1 / 5 page tfs248K.doc version 1.2 08.01.2004 VI TELEFILTER 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 fN - 248,5 MHz Centre Frequency fC 248,5 MHz - Pass band PB fN 0,2 MHz Absolute Attenuation aabs fN ...fN ± 200 kHz 4,5 dB max. 7 dB fN ± 1 MHz ...fN ± 2 MHz 25 dB min. 15 dB fN ± 2 MHz ...fN ± 21,4 MHz 42 dB min. 35 dB fN ± 21,4 MHz ...fN ± 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 - *) 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. **) f(Hz) = TCf(ppm/K) x (T-T0)² x fTo(MHz). 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. |
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