TFS448

      The TFS448 has Measurement condition including Ambient temperature: 23 °C;Input power level: 0 dBm;Terminating impedances,Input: 340 || -1,05 pF,Output: 340 || -1,05 pF.
      Reference level for the relative attenuation arel of the TFS448 is the maximum of the pass band attenuation amax. The maximum of the attenuation within the usable signal bandwidth 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 448,0125 MHz without tolerance. The given values for the relative attenuation 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.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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