? preliminary 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. RO2166A-050901 electrical characteristics characteristic sym notes minimum typical maximum units frequency (+25 c) nominal frequency RO2166A f c 2, 3, 4, 5 857.575 857.725 mhz RO2166A-1 857.500 857.800 RO2166A-2 857.550 857.750 tolerance from 857.65 mhz RO2166A d f c 75 khz RO2166A-1 150 RO2166A-2 100 insertion loss il 2, 5, 6 1.1 2.0 db quality factor unloaded q q u 5, 6, 7 24,700 50 w loaded q q l 4,000 temperature stability turnover temperature t o 6, 7, 8 15 30 45 c turnover frequency f o f c khz frequency temperature coefficient ftc 0.032 ppm/c 2 frequency aging absolute value during the first year |fa| 1 10 ppm/yr dc insulation resistance between any two terminals 5 1.0 m w rf equivalent rlc model motional resistance r m 5, 6, 7, 9 19 w motional inductance l m 88.546 h motional capacitance c m 0.3889 ff transducer static capacitance c o 5, 6, 9 2.8 3.1 3.4 pf test fixture shunt inductance l test 2, 7 11.1086 nh lid symbolization 262 ? ideal for european 857.65 mhz transmitters ? very low series resistance ? quartz stability ? surface-mount ceramic case with 21 mm 2 footprint ? complies with directive 2002/95/ec (rohs) the RO2166A 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 857.65 mhz. this saw is designed for 868.35 mhz superhet receivers with 10.7 mhz if. applications include remote-control and wireless security receivers operating under etsi-ets 300 220 in europe and under ftz 17 tr 2100 in germany. absolute maximum ratings rating value units cw rf power dissipation +0 dbm dc voltage between terminals 30 vdc case temperature -40 to +85 c soldering temperature (10 seconds / 5 cycles max.) 260 c 857.65 mhz saw resonator RO2166A RO2166A-1 RO2166A-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 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 w test system (vswr 1.2:1). the shunt inductance, l test , is tuned for parallel resonance with c o at f c . typically, f os- cillator 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, 3db 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 frequency (10mhz) with a capacitance meter. the measurement includes para- sitic 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. sm-2 case
857.65 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. RO2166A-050901 electrical connections the saw resonator is bidirectional and may be in- stalled 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 recommend- ed to help reduce parasitic capacitance in the cir- cuit. typical test circuit the test circuit inductor, l test , is tuned to resonate with the static capaci- tance, c o , at f c . typical application circuits equivalent lc mode l temperature characteristics the curve shown on the right accounts for resonator contri- bution only and does not in- clude lc component tempera- ture contributions . typical circuit board land pattern the circuit board land pattern shown below is one possible design. the op- timum 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 capacitance. trace lengths from terminal lands to other components should be short and wide to mini- mize 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 w network analyzer network analyzer to 50 w electrical test +9vdc 47 rf bypass l1 (antenna) c1 c2 200k w 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 1.91 2.16 0.075 0.085 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 cm -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) typical dimension: 0.010 to 0.047 inch (0.25 to 1.20 mm) (4 places)
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