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B3757 Datasheet(PDF) 3 Page - EPCOS |
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B3757 Datasheet(HTML) 3 Page - EPCOS |
3 / 6 page 3 Mar 20, 2003 SAW Components B3757 434,42 MHz Low-loss Filter Data Sheet Characteristics Reference temperature: TA = –40 ... +95˚C Terminating source impedance: ZS = 50 Ω and matching network Terminating load impedance: ZL = 50 Ω and matching network 2) Impedance for passband matching bases on an ideal, perfect matching of the SAW filter to source- and to load impedance (here 50 Ohm). After the SAW filter is removed and input imped- ance into the input matching / output matching network is calculated. The conjugate complex value of these characteristic impedances are the input and output imped- ances for flat passband. For more details, we refer to EPCOS application note #4. min. typ. max. Center frequency fC — 434,42 — MHz (center frequency between 3 dB points) Minimum insertion attenuation α min (including losses in matching network) 434,26 ... 434,58 MHz — 2,0 3,0 dB Pass band (relative to α min) 434,26 ... 434,58 MHz — 0,5 2,0 dB 434,24 ... 434,60 MHz — 0,7 3,0 dB 434,20 ... 434,64 MHz — 1,0 6,0 dB Pass bandwidth α rel≤ 3 dB 0,64 0,70 0,76 MHz Relative attenuation (relative to α min) α rel 10,00 ... 414,50 MHz 55 62 — dB 414,50 ... 425,00 MHz 48 55 — dB 425,00 ... 432,22 MHz 31 35 — dB 432,22 ... 432,62 MHz 39 44 — dB 432,62 ... 433,60 MHz 8 11 — dB 435,42 ... 442,50 MHz 10 14 — dB 442,50 ... 550,00 MHz 36 44 — dB 550,00 ... 700,00 MHz 55 60 — dB 700,00 ... 805,00 MHz 40 45 — dB 805,00 ...1000,00 MHz 60 70 — dB Impedance for pass band matching 2) Input: ZIN = RIN || CIN — 310 || 2,2 — Ω || pF Output: ZOUT = ROUT || COUT — 310 || 2,2 — Ω || pF |
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