www.rfm.com e-mail: info@rfm.com page 1 of 2 ?2009 by rf monolithics, inc. RO3073E-1 8/13/09 electrical characteristics characteristic sym notes minimum typical maximum units frequency (+25 c) absolute frequency f c 2, 3, 4, 5 314.950 315.050 mhz tolerance from 315.0 mhz ? f c 50 khz insertion loss il 2, 5, 6 1.6 2.4 db quality factor unloaded q q u 8200 50 ? loaded q q l 1350 temperature stability turnover temperature t o 6, 7, 8 10 25 35 c turnover frequency f o f c frequency temperature coefficient ftc 0.032 ppm/c 2 frequency aging absolute value during the first year |f a | 1, 6 10 ppm/yr dc insulation resistance between any two terminals 5 1.0 m ? rf equivalent rlc model motional resistance r m 5, 7, 9 19.8 ? motional inductance l m 82 h motional capacitance c m 3.1 ff shunt static capacitance c o 5, 6, 9 4.1 pf test fixture shunt inductance l test 2, 7 63 nh lid symbolization 802 // ywws standard reel quantity reel size 7 inch 10 500 pieces / reel reel size 13 inch 3000 pieces / reel ? ideal for 315 mhz automotive-keyless-entry transmitters very low series resistance quartz stability complies with directive 2002/95/ec (rohs) the RO3073E-1 is a true one-port, surface-acoustic-wave (saw) resonator in a surface-mount, ceramic case. it provides reliable, fundamental-mode, quartz frequency stabilization of local oscillators operating at approximately 315 mhz. this saw was designed for am transmitters in automotive-keyless-entry applica- tions operating in the usa under fcc part 15, in canada under doc rss-210, and in italy. absolute maximum ratings rating value units input power level 0 dbm dc voltage 12 vdc storage temperature range -40 to +125 c operating temperature range -40 to +105 c soldering temperature (10 seconds / 5 cycles max.) 260 c 315.0 mhz saw resonator RO3073E-1 caution: electrostatic sensitive device. observe precautions for handling. notes: 1. frequency aging is the change in f c with time and is specified at +65c or less. aging may exceed the specification for prolonged temperatures above +65c. typically, aging is greatest the first year after manufacture, decreasing in subse- quent years. 2. the center frequency, f c , is measured at the minimum insertion loss point, il min , with the resonator in the 50 ? test system (vswr 1.2:1). the shunt induc- tance, l test , is tuned for parallel resonance with c o at f c . typically, f oscilla- tor or f transmitter is approximately equal to the resonator f c . 3. one or more of the following united states patents apply: 4,454,488 and 4,616,197. 4. typically, equipment utilizing this device requires emissions testing and govern- ment approval, which is the responsibility of the equipment manufacturer. 5. unless noted otherwise, case temperature t c = +25c2c. 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) fre- quency, f o . the nominal frequency at any case temperature, t c , may be calcu- lated from: f = f o [1 - ftc (t o -t c ) 2 ]. typically oscillator t o is approximately equal to the specified resonator t o . 9. this equivalent rlc model approximates resonator performance near the reso- nant frequency and is provided for reference only. the capacitance c o is the static (nonmotional) capacitance between the two terminals measured at low fre- quency (10 mhz) with a capacitance meter. the measurement includes parasitic capacitance with "nc? pads unconnected. case parasitic capacitance is approximately 0.05 pf. transducer parallel capacitance can by calculated as: c p c o -0.05pf. 10. tape and reel standard per ansi / eia 481. sm3030-6 case 3.0 x 3.0 pb pb
315.0 mhz saw resonator www.rfm.com e-mail: info@rfm.com page 2 of 2 ?2009 by rf monolithics, inc. RO3073E-1 8/13/09 case dimensions -80 -60 -40 -20 0 +20 +40 +60 0 -50 - 100 - 150 +80 - 200 0 -50 -100 -150 -200 f c = f o , t c = t o ? t = t c - t o ( c ) (f-f o o ) / f (ppm) 0.05 pf* 0.05 pf c p c o + = *case parasitics c p rm lm c m equivalent lc mode l temperature characteristics the curve shown on the right accounts for resonator contribution only and does not include lc component temperature contributions . pin connection 1nc 2 terminal 3nc 4nc 5 terminal 6nc power test electrical connections the saw resonator is bidirectional and may be installed with either orientation. the two terminals are interchangeable and unnumbered. the callout nc indi- cates no internal connection. the nc pads assist with mechanical positioning and stability. external grounding of the nc pads is recommended to help reduce parasitic capacitance in the circuit. typical test circuit the test circuit inductor, l test , is tuned to resonate with the static capacitance, c o , at f c . electrical test typical application circuits dimension mm inches min nom max min nom max a 2.87 3.0 3.13 0.113 0.118 0.123 b 2.87 3.0 3.13 0.113 0.118 0.123 c 1.12 1.25 1.38 0.044 0.049 0.054 d 0.77 0.90 1.03 0.030 0.035 0.040 e 2.67 2.80 2.93 0.105 0.110 0.115 f 1.47 1.6 1.73 0.058 0.063 0.068 g 0.72 0.85 0.98 0.028 0.033 0.038 h 1.37 1.5 1.63 0.054 0.059 0.064 i 0.47 0.60 0.73 0.019 0.024 0.029 j 1.17 1.30 1.43 0.046 0.051 0.056 from 50 ? network analyzer to 50 ? network analyzer 2 3 6 5 4 1 low-loss matching network to 50 ? 50 ? source at f c p incident p reflected 2 3 6 5 4 1 modulation input roxxxxc bottom view 200k ? c1 l1 (antenna) 47 +9vdc c2 rf bypass 470 typical low-power transmitter application 2 3 6 5 4 1 +vdc roxxxxc bottom view 200k ? c1 l1 +vdc c2 rf bypass typical local oscillator application output 2 3 6 5 4 1 1 2 3 6 5 4 1 2 3 6 5 4 a bc d j ef gh i
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