TFS38C

      TFS38C is a kind of VT telefilter.Here you can get some information about the measurement condition.The ambient temperature (T_A) is 23.The input power level is 0 dBm.The terminating impedances in fc is 50//0 pF for input and output.
      What comes next is about the characteristics of TFS38C.The typical insertion loss (Reference level) (ae) is 22.5 dB and the maximum is 25 dB.The norminal frequency at T_O=30 (f_N) is 38.000 MHz.The typical centre frequency (f_CAT) is 38.019 MHz.The typical pass band (PB) at OTR:0 to 60 is from f_N-2.48 MHz to f_N+2.48 MHz.The amplitude ripple in PB(p-p) is 0.15 dB and the maximum is 0.4 dB.The maximum relative attenuation (a_rel) is 0.4 dB and the typical is 0.15 dB at f_N to f_N±2.48 MHz.The maximum arel is 3 dB and the typical is 2 dB at f_N ±2.48 MHz to f_N ±3.0 MHz.The minimum arel is 30 dB and the typical is 40 dB at f_N ±4.25 MHz to f_N ±6 MHz.The typical group delay (mean value in PB) is 1.46s.The typical group delay ripple in PB(p-p) is 25 ns and the maximum is 60 ns.The typical deviation from linear phase in PB (p-p) is 1.5 deg.The typical triple transit attenuation compared to main signal is 55 dB.The crosstalk attenuation compared to main signal is from 60 to 70 dB.The typical triple transit attenuation compared to main signal is 60 dB.The maximum input power level is 15 dBm.The typical temperature coefficient of frequency (T_cf) is -75 ppm/K.The operating temperature range is from 0 to + 60.The storage temperature range is from -25 to + 85.
      There are some remarks about the characteristics of TFS38C.Reference level for the relative attenuation arel of the TFS 38C is the minimum of the pass band attenuation amin. The minimum of the pass band attenuation amin is defined as the insertion loss a_e . The centre frequency fc is the arithmetic mean value of the upper and lower frequencies at the 20 dB filter attenuation level relative to the insertion loss a_e. The nominal frequency f_N is fixed on 38 MHz without tolerance.The temperature coefficient of frequency T_cf is valid both for the reference frequency f_c and the frequency response of the filter. All specified parameters have to be reached in the operating temperature range (OTR)