? rf monolithics, inc. phone: (972) 233-2903 fax: (972) 387-8148 e-mail: info@rfm.com page 1 of 2 rfm europe phone: 44 1963 251383 fax: 44 1963 251510 http://www.rfm.com ?1999 by rf monolithics, inc. the stylized rfm logo are registered trademarks of rf monolithics, inc. RO2144E_RO2144E-1_RO2144E-2_042505 electrical characteristics characteristic sym notes minimum typical maximum units frequency (+25 c) nominal frequency RO2144E f c 2, 3, 4, 5 916.300 916.700 mhz RO2144E-1 916.350 916.650 RO2144E-2 916.405 916.595 tolerance from 916.5 mhz RO2144E d f c 200 khz RO2144E-1 150 RO2144E-2 95 insertion loss il 2, 5, 6 1.2 1.6 db quality factor unloaded q q u 5, 6, 7 8000 8900 50 w loaded q q l tbd temperature stability turnover temperature t o 6, 7, 8 15 25 35 c turnover frequency f o fc mhz frequency temperature coefficient ftc 0.032 ppm/c 2 frequency aging absolute value during the first year |fa| 1 10 ppm dc insulation resistance between any two terminals 5 1.0 m w rf equivalent rlc model motional resistance r m 5, 6, 7, 9 12 17 w motional inductance l m 19.8 h motional capacitance c m 1.7 ff transducer static capacitance c p 5, 6, 9 1.9 pf test fixture shunt inductance l test 2, 7 tbd nh lid symbolization 515 // ywws standard reel quantity reel size 7 inch 10 500 pieces / reel reel size 13 inch 3000 pieces / reel ? ideal for 916.5 mhz fcc part 15 transmitters ? very low series resistance ? quartz stability ? complies with directive 2002/95/ec (rohs) the RO2144E is a true one-port, surface-acoustic-wave (saw) resonator in a surface-mount ceramic case. it provides reliable, fundamental-mode stabilization of fixed-frequency transmitters operating at 916.5 mhz. this saw is designed specifically for remote-control and data-link transmitters operating in the usa under fcc part 15 regulations. absolute maximum ratings rating value units input power level 10 dbm dc voltage 12 vdc storage temperature -40 to +125 c operating temperature range -40 to +125 c 916.5 mhz saw resonator RO2144E RO2144E-1 RO2144E-2 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 great- est the first year after manufacture, decreasing in subsequent years. 2. the center frequency, f c , is measured at the minimum insertion loss point, il min , with the res- onator in the 50 w test system (vswr 1.2:1). the shunt inductance, l test , is tuned for par- allel resonance with c o at f c . typically, f oscillator 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 government 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, 3db bandwidth, f c versus t c , and c o . 8. turnover temperature, t o , is the temperature of maximum (or turnover) frequency, f o . the nominal frequency at any case temperature, t c , may be calculated 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 resonant fre- quency and is provided for reference only. the capacitance c o is the static (nonmotional) capacitance between the two terminals measured at low frequency (10mhz) with a capaci- tance meter. the measurement includes parasitic capacitance with "nc? pads unconnected. case parasitic capacitance is approximately 0.05pf. transducer parallel capacitance can by calculated as: c p ? c o -0.05pf. 10. tape and reel standard for ansi / eia 481. sm3030-6 case 3.0 x 3.0 pb
916.5 mhz saw resonator rf monolithics, inc. phone: (972) 233-2903 fax: (972) 387-8148 e-mail: info@rfm.com page 2 of 2 rfm europe phone: 44 1963 251383 fax: 44 1963 251510 http://www.rfm.com ?1999 by rf monolithics, inc. the stylized rfm logo are registered trademarks of rf monolithics, inc. RO2144E_RO2144E-1_RO2144E-2_042505 -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 d 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 cm 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 1 nc 2 terminal 3 nc 4 nc 5 terminal 6 nc 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 from 50 w network analyzer to 50 w network analyzer 2 3 6 5 4 1 low-loss matching network to 50 w 50 w source at f c p incident p reflected 2 3 6 5 4 1 modulation input roxxxxc bottom view 200k w 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 w 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 b c d j e f g h i case dimensions 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
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