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B3688 Datasheet(PDF) 3 Page - EPCOS |
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B3688 Datasheet(HTML) 3 Page - EPCOS |
3 / 5 page 3 Jan 29, 2003 SAW Components B3688 499,25 MHz Low-Loss Filter Data Sheet Characteristics Operating temperature: T = -25 ... +75 ˚C Terminating source impedance: ZS =50 Ω and matching network Terminating load impedance: ZL =50 Ω and matching network Matching circuit: Cp1 = 14pF 2) Ls2 = 21nH 2) Ls3 = 22nH 2) Cp4 = 13pF 2) 1) Temperature dependance of fc: fc(TA) = fc(T0)(1 + TCf(TA – T0)2) 2) Element values depend on PCB layout min. typ. max. Nominal frequency fN — 499,25 — MHz Insertion attenuation at fN (T=25 ˚C) α N 6,0 8,0 9,0 dB Variation of insertion att. (rel. to α N) α rel —— ±0,9 dB Frequency response 3 dB Lower frequency fL 3dB — 498,27 498,75 MHz 3 dB Upper frequency fU 3dB 499,75 500,23 — MHz 35 dB Lower frequency fL35dB 496,25 496,75 — MHz 35 dB Upper frequency fU35dB — 501,85 502,25 MHz Amplitude ripple (peak to adjacent valley) fN ± 100 kHz — — 0,5 dB Relative attenuation α rel fN - 200,0 MHz ... fN - 10,0 MHz 40 55 — dB fN - 10,0 MHz ... fN - 3,0 MHz 35 48 — dB fN + 3,0 MHz ... fN + 10,0 MHz 35 43 — dB fN + 10,0 MHz ... fN + 200,0 MHz 40 51 — dB Temperature coefficient of frequency 1) TCf — – 0,036 — ppm/K2 Turnover temperature T0 —25 — ˚C |
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