TFS912

      The TFS912 is designed as VI telefilter.Reference level for the relative attenuation arel of the TFS 912 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 912,5 MHz without tolerance. The given values for the relative attenuation arel 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.
      Some important specifications TFS912 have been concluded into several points as follow.The first one is about its insertion loss which would be typ 3.85 dB and max. 5.0 dB.The next one is about its nominal frequency which would be max 912,5 MHz.The next one is about its centre frequency which would be typ 912,5 MHz.The next one is about its 2 dB bandwidth which would be typ 54,3 MHz.The next one is about its 3 dB bandwidth which would be typ 57,7 MHz and min. 45,0 MHz.The next one is about its pass band ripple within ± 22,5 MHz which would be typ 1.8 dB and max. 3,0 dB.The next one is about its operating temperature range which would be from -25 °C to + 75 °C.The next one is about its storage temperature range which would be from -30 °C to + 80 °C.The next one is about its temperature coefficient which would be typ -72 ppm/K.Something should be noted that 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.And so on.For more information please contact us.