features applications remote control sa w resonat ors SR418-T 418.000mhz fc 418.0 mhz 12,500 2,000 90.665 h 1.6006 ff 1.8 pf in a low-profile, stabilization the SR418-T is a true one-port, surface-acoustic-wave(saw) resonator to-39 case. it provides reliable, fundamental-mode, quartz frequency of fixed-frequency transmitters operating at 418.0mhz. 2.2 db max. 29 max. specification dimensions unit: mm equivalent lc mode pin connection 1 t erminal 1 2 t erminal 2 3 case ground 0.5pf rm cm lm co=cp+0.25pf case parasitise cp typical applica tion circuit 9 . 3 0 . 2 5 . 0 8 0 . 1 3.4 0.2 5 0 . 2 0.45 0.2 0.5pf terminal 1 terminal 2 from 50 source to 5 0 load +v c1 c2 c3 l1 r2 r1 +v c1 c2 c3 l1 r2 r1 saw saw 1 2 3 tube 0 -50 -100-150 -200 -80 -60 -40 -20 0 +20 +40+60 +80 fc=fo, tc=t o t=tc-t o( ) temperature characteristics 0 -50 -100-150 -200 ( f - f o ) / f o ( p p m ) telecontrol circuit local oscillator application to-39 the cure shown above accounts for resonator contribution only and does not include oscillator temperature characteristics package typical frequency response option code product centre frequency(fc) : parameters 418.000 operating temp. range: -10 ~+60 unloaded q(q u ): dc insulation resistance between any two pins: 1.0m min. storage temp. range: -40 ~+85 frequency aging absolute value the first y ear(fa): during 10ppm/year turnover t emp(to): 55 max. turnover frequency(fo): 2 0.037ppm/ insertion loss(il): 50 loaded q(q l): quality factor frequency tolerance( fc): 75khz 100khz150khz 200khz a b cd temp. stability frequency temp. (ftc): coefficient sr sr optional: please specify required code when inquiring or ordering standard specifications subject to change without notice package: u motional resistance(r m ): motional inductance(l m ): motional capacitance(c m ): shunt static capacitance (co): cw therefore power dissipation: dc voltage between any t wo pins: case temperature: +10dbm 30v dc -40 ~+85 rf equivalent rlc model holder type: t note 1: electrostatic sensitive device. observe precautions for handling 2 . freq. aging is the change in fc with time and is specified at +65 or less. aging may exceed the specification for prolonged temp. above +65 . typiclly, aging is greatest the first year after manufacture, decreasing in subsequent years. 3. the centre freq. fc , is the freq. of minimum il with te resonator in te specified test fixture in a 50 test system with vswr 1.2:1. typically, f oscillator or f transmiter is less than the resonator fc. 4. typically, equipment utilizing this device requires emissions testing and government approval. which s the responsibility of the equipment manufacturer 5.unless noted otherwise , case temperature tc=+25 2 . 6.the design, manufacturing process, and specifications of this device are subject to change without notice. 7.derived mathematically from one or more of the following directly measured parameters: f c , il, 3 db bandwidth, f c versus t c , and c o 8.turnover temperature, t o , is the temperature of maximum (or turnover) freq., f o , the nominal center freq. at any case temp. , t c , may be calculated from :f= 2 f o [1-ftc (t o -t c ) ]. typically, oscillator t o is 20 less than the specified resonator to. e.g. tgs sr 418.0 a t u standard package in tube: 20pcs/tube. 1:transmission /m log mag 5.0 db/ ref -1.50db 2:off ch1:mkr1 418.030 mhz -1.25 db ch1 1 1 part number guide tgs mark sr saw r esonators one-port 418 centre freq. t holder type u package a frequency tolerance 4 1 8 .0 4 1 8 .0 1 2 3 1 2 3 tgs crystals ltd. www.tgs.cn www. tgscrystals. com c tgs crystals l td. updated on apr . 2004 r r g s g s
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