www.rfm.com e-mail: info@rfm.com page 1 of 2 ?2008 by rf monolithics, inc. RO2101A-17 - 3/25/08 electrical characteristics characteristic sym notes minimum typical maximum units center frequency (+25 c) absolute frequency f c 2,3,4,5 433.845 433.995 mhz tolerance from 433.920 mhz f c 75 khz insertion loss il 2,5,6 1.2 2.2 db quality factor unloaded q q u 5,6,7 11015 50 loaded q q l 1273 temperature stability turnover temperature t o 6,7,8 10 25 40 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 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 15 motional inductance l m 63 h motional capacitance c m 2.15 ff shunt static capacitance c o 5, 6, 9 2.0 2.3 2.6 pf test fixture shunt inductance l test 2, 7 58 nh lid symbolization (in addition to lot and/or date codes) 573 ? ideal for european 433.92 mhz transmitters ? very low series resistance ? surface-mount ceramic case with 21 mm 2 footprint ? complies with directive 2002/95/ec (rohs) the RO2101A-17 is a true one-port, su rface-acoustic-wave (saw) resonator in a surface-mount, ceramic case. it provides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters operating at 433.92 mhz. this saw is designed specif ically for remote-control and wireless security transmitters operating in europe under etsi i-ets 300 220 and in germany under ftz 17 tr 2100. absolute maximum ratings rating value units cw rf power dissipation (see: typical test circuit) +0 dbm dc voltage between terminals (observe esd precautions) 12 vdc storage temperature -40 to +125 c soldering temperature (10 seconds / 5 cycles max.) 260 c operating temperature range -40 to +125 c 433.92 mhz saw resonator RO2101A-17 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 tem- peratures above +65c. typically, agi ng is greatest the first year after manufacture, decreasi ng in subsequent 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 inductance, l test , is tuned for parallel 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, 3 db 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 approx imates resonator performance near the resonant frequency and is provided for reference only. the capacitance c o is the static (nonmotional) capacitance between the two terminals measured at low frequency (10 mhz) with a capacitance meter. the measurement includes parasitic capac itance 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. sm-2 case
www.rfm.com e-mail: info@rfm.com page 2 of 2 ?2008 by rf monolithics, inc. RO2101A-17 - 3/25/08 electrical connections the saw resonator is bidirectional and may be installed with either orientation. the two terminals are interchangeable and unnumbered. the callout nc indicates 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 . typical application circuits 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. typical circuit board land pattern the circuit board land pattern shown below is one possible design. the optimum land pattern is dependent on the circuit board assembly process which varies by manufacturer. the distance between adjacent land edges should be at a maximum to minimize parasitic capacitanc e. trace lengths from terminal lands to other components should be short and wide to minimize parasitic series inductances. case design the case material is black alumina with contrasting symbolization. all pads are nominally centered with respect to the base and consist of 40 to 70 microinches electroless gold on 60-350 micorinches electroless nickel. nc nc terminal terminal from 50 network analyzer network analyzer to 50 electrical test +9vdc 47 rf bypass l1 (antenna) c1 c2 200k modulation input roxxxxa bottom view 470 typical low-power transmitter application rf bypass l1 c1 c2 roxxxxa bottom view typical local oscillator application +vdc +vdc output dimensions millimeters inches min max min max a 5.74 5.99 0.226 0.236 b 3.73 3.99 0.147 0.157 c 1.70 2.29 0.067 0.090 d 0.94 1.10 0.037 0.043 e 0.83 1.20 0.033 0.047 f 1.16 1.53 0.046 0.060 g 0.94 1.10 0.037 0.043 h 0.43 0.59 0.017 0.023 k 0.43 0.59 0.017 0.023 m 5.08 5.33 0.200 0.210 n 0.38 0.64 0.015 0.025 p 3.05 3.30 0.120 0.130 0.05 pf* 0.05 pf c p c o + = *case parasitics c p rm lm c m -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) typical dimension: 0.010 to 0.047 inch (0.25 to 1.20 mm) (4 places)
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