TFS868C

This is the description about TFS868C of the VI filter specification. Reference level for the relative attenuation arel of the tfs 868c 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 868, 30 mhz without tolerance. The given values for the relative attenuation arel 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.

Here are the TFS868C features: Ambient temperature is 23°C. Input power level is 0dBm. Terminating impedances for input is 63// -1,50 pF. Terminating impedances for output is 63// -1,50 pF.

The TFS868C absolute maximum ratings are these (TA = 25°C). Insertion loss (Reference level) is max. 5,5 dB. Nominal frequency is 868,30 MHz. Centre frequency is 868,30 MHz . 3 dB bandwidth BW is min. 500 kHz. 6 dB bandwidth BW is 700 kHz. Group delay ripple within PB is max. 75 ns. Operating temperature range is from 25 ° to +80° C. Storage temperature range is from -25 ° to +80° C. Temperature coefficient of frequency is -0,036 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.

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