TFS321

      The TFS321 is designed as VI telefilter.Reference level for the relative attenuation arel of the TFS321 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 on 321,4 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 also 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 specifications  of TFS321 have been concluded into several points as follow.The first one is about its insertion loss which would be max 6.5dB.The next one is about its nominal frequency which would be max 321.400MHz.The next one is about its centre frequency which would be typ 321.41. The next one is about its usable signal bandwidth which would be min 140 kHz.The next one is about its 3 dB bandwidth which would be min 280 kHz.The next one is about its group delay ripple which would be max 2 us for fN ± 70 kHz.The next one is about its input power level which would be max 13dBm.The next one is about its operating temperature range which would be from -20°C to +70 °C.The next one is about its temperature coefficient of frequency which would be typ -0.036 ppm/K².The next one is about its frequency inversion temperature which would be + 20 °C.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.