TFS224

      Reference level for the relative attenuation arel of the TFS 224 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 224,0 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.
     There are some specifications about TFS224 under the conditions: Ambient temperature is 23 C;Input power level is 0 dBm;Terminating impedances at fc *: input is 680 // -1.8 pF;output is 680 // -1.8 pF. Insertion loss at fN(reference level) is 3.5 dB typ and max. 5.2 dB.Nominal frequency (fN) is 2240 MHz . Centre frequency (fC)( at ambient temperature) is 224015 MHz typ . Temperature coefficient of frequency ( Tcf ) is - 0.036 ppm/K typ.Frequency deviation of fc over temperature To is 13°C. Operating temperature range is - 45 °C to + 75 °C.Storage temperature range is - 45 °C to + 75 C.2dB bandwidth (BW) is 178 kHz typand 100 kHz min.( note: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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