? 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. RO2156D_RO2156D-1_RO2156D-2 _090503 electrical characteristics characteristic sym notes minimum typical maximum units frequency at +25c nominal frequency RO2156D f c 2,3,4,5 868.875 869.025 mhz RO2156D-1 868.875 869.175 RO2156D-2 868.850 869.050 tolerance from 868.95 mhz RO2156D d f c 75 khz RO2156D-1 -75 +225 RO2156D-2 100 insertion loss il 2,5,6 1.1 2.0 db quality factor unloaded q q u 5,6,7 20,000 50 w loaded q q l 2,400 temperature stability turnover temperature t o 6,7,8 10 25 40 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 15 w motional inductance l m 50 h motional capacitance c m 0.7 ff shunt static capacitance c o 5, 6, 7, 9 2.3 pf lid symbolization (in addition to lot and/ or date code) 433 / ywwd standard reel quanitity 3000 pieces / reel ? ideal for european 868.95 mhz transmitters ? very low series resistance ? quartz stability ? complies with directive 2002/95/ec (rohs) the RO2156D 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 fixed-frequency transmitters operat- ing at 868.95 mhz. this saw is designed specifically for remote-control and wireless security transmitters operating under etsi-ets 300 220 in europe and under ftz 17 tr 2100 in germany. absolute maximum ratings rating value units input power level 10 dbm dc voltage 12 vdc storage temperature -40 to +85 c soldering temperature (10 seconds / 5 cycles max.) 260 c 868.95 mhz saw resonator RO2156D RO2156D-1 RO2156D-2 caution: electrostatic sensitive device. observe precautions for handling. notes: 1. lifetime (10 year) frequency aging. 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 . 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 gov- ernment approval, which is the responsibility of the equipment manufacturer. 5. unless noted otherwise, case temperature t c =+25c2c for all specifica- tions. 6. the design, manufacturing process, and specifications of this device are sub- ject 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 cal- culated from: f=f o [1-ftc(t o -t c ) 2 ]. 9. this equivalent rlc model approximates 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 (10mhz) with a capacitance meter. the measurement includes parasitic capacitance with ?nc? pads unconnected. case parasitic capacitance is approximately 0.05pf. transducer parallel capacitance can be calculated as: c p ? c o - 0.05pf. sm3838-6 case 3.8 x 3.8 pb
868.95 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. RO2156D_RO2156D-1_RO2156D-2 _090503 -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 g h i case dimensions dimension mm inches min nom max min nom max a 3.60 3.80 4.0 0.14 0.15 0.16 b 3.60 3.80 4.0 0.14 0.15 0.16 c 1.00 1.20 1.40 0.04 0.05 0.055 d 0.95 1.10 1.25 0.037 0.043 0.05 e 2.39 2.54 2.69 0.090 0.10 0.110 g 0.90 1.0 1.10 0.035 0.04 0.043 h 1.90 2.0 2.10 0.75 0.08 0.83 i 0.50 0.6 0.70 0.020 0.024 0.028 j 1.70 1.8 1.90 0.067 0.07 0.075
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