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B4812 Datasheet(PDF) 3 Page - EPCOS |
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B4812 Datasheet(HTML) 3 Page - EPCOS |
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3 / 5 page  3 Jul 11, 2003 SAW Components B4812 246,01 MHz Low-Loss Filter Data Sheet Characteristics Reference temperature: T = 25 ˚C Terminating source impedance: ZS = 700 Ohm || -2,6 pF Terminating load impedance: ZL = 700 Ohm || -2,6 pF 1) Temperature dependence of fc: fc(T) = fc(T0)(1 + TCf(T – T0)2) Test matching network to 50 Ω (element values depend on PCB layout): min. typ. max. Nominal frequency fN — 246,01 — MHz Minimum insertion attenuation α min 2,0 3,2 5,0 dB (including loss in matching coils) Amplitude ripple (p-p) ∆α fN - 67,5 kHz ... fN + 67,5 kHz — 0,6 2,0 dB fN - 80,0 kHz ... fN + 80,0 kHz — 0,7 3,0 dB Group delay ripple (p-p) ∆τ fN - 50,0 kHz ... fN + 50,0 kHz — 0,5 1,5 µs fN - 80,0 kHz ... fN + 80,0 kHz — 1,2 3,0 µs Relative attenuation (relative to α min) α rel fN - 25,00 MHz ... fN - 3,00 MHz 50 60 — dB fN - 3,00 MHz ... fN - 1,60 MHz 48 60 — dB fN - 1,60 MHz ... fN - 0,60 MHz 38 50 — dB fN - 0,60 MHz ... fN - 0,40 MHz 28 40 — dB fN - 0,40 MHz ... fN - 0,20 MHz 8 14 — dB fN + 0,20 MHz ... fN + 0,40 MHz 8 14 — dB fN + 0,40 MHz ... fN + 0,60 MHz 28 40 — dB fN + 0,60 MHz ... fN + 1,60 MHz 38 50 — dB fN + 1,60 MHz ... fN + 3,00 MHz 48 60 — dB fN + 3,00 MHz ... fN + 25,00 MHz 50 60 — dB Impedance at fN Input: ZIN = RIN || CIN — 700 || 2,6 — Ω || pF Output: ZOUT = ROUT || COUT — 700 || 2,6 — Ω || pF Temperature coefficient of frequency 1) TCf — – 0,036 — ppm/K2 Frequency inversion point T0 —25 — ˚C Cp1 = 1,8 pF Ls2 =56 nH Ls3 =56 nH Cp4 = 1,8 pF |
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