preliminary rf monolithics, inc. phone: (972) 233-2903 fax: (972) 387-8148 e-mail: info@rfm.com page 1 of 5 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. OP4008B-041003 electrical characteristics characteristic sym notes minimum typical maximum units operating frequency absolute frequency f o 1, 9 669.327 mhz tuning range 2 100 ppm tuning voltage 1 0 +3 v tuning linearity 1, 8 3 % tuning sensitivity df/dv 2,10 140 300 ppm/v modulation bandwidth 125 265 khz q and q output voltage into 50 w (vswr 1.2) v o 1,3 0.60 1.1 v p-p operating load vswr 1,3 2:1 symmetry 3, 4, 5 49 51 % harmonic spurious 3, 4, 6 -30 dbc nonharmonic spurious 3, 4, 6, 7 -60 dbc phase noise @100 hz offset -75 dbc/hz @ 1 khz offset -105 dbc/hz @ 10 k offset -125 dbc/hz noise floor -155 dbc/hz q and q jitter rms jitter 3, 4, 6, 7 2 ps p-p no noise on v cc 3, 4, 6, 7 12 ps p-p with 200 mv p-p noise added from 1 mhz to ? f o 3 12 ps p-p output dc resistance (between q & q ) 1, 3 50 k w dc power supply operating voltage v cc 1, 3 3.13 3.3, 5.0 5.25 vdc operating current i cc 1, 3 70 ma operating case temperature t c 1, 3 -40 +85 c lid symbolization (yy=year, ww=week) rfm OP4008B yyww smc-08 ? quartz saw stabilized and filtered ?diff sine? technology ? fundamental-mode oscillation at 669.327 mhz ? voltage tunable for phase lock loop operations ? optical timing reference for forward error correction applications the output of this device is generated and filtered by narrow-band quartz saw elements at 669.327 mhz. the configuration of this clock provides a pure signal for optical timing applications in noisy signal environ- ments. the q/ q differential output swing of 1 volt about 0 vdc has symmetry better than 1% into loads from 40 to 70 ohms, determined by customer application. the long term frequency accuracy is set by an external reference source allowing this device to complete a phase lock loop design without the usual noise and jitter problems associated with pll?s. absolute maximum ratings rating value units dc suppy voltage 0 to 5.5 vdc tuning voltage 0 to 6 vdc case temperature -55 to 100 c 669.327 mhz optical timing clock OP4008B caution: electrostatic sensitive device. observe precautions for handling. cocom caution: approval by the u.s. department of commerce is required prior to export of this device. notes: 1. unless otherwise noted, all specifications include any combination of load vswr, vcc, and temperature, with q and q terminated into 50ohm loads to ground (see typical test circuit). 2. useful tuning range is in excess of what is required over temp, aging, pushing, pulling & accuracy. 3. the design, manufacturing process, and specifications of this device are subject to change without notice. 4. only under the nominal conditions of 50 w load impedance with vswr 1.2 and nominal power supply voltage. 5. symmetry is defined as the pulse width (in percent of total period) measured at the 50% points of q or q (see timing definitions). 6. jitter and other spurious outputs induced by externally generated electrical noise on v cc or mechanical vibration are not included in this specification, except where noted. external voltage regulation and careful pcb layout are recommended for optimum perfor- mance. 7. applies to period jitter of q and q . measurements are made with the tektronix csa803 signal analyzer with at least 1000 samples. 8. linearity is a function of the percentage variation from a permitted linear deviation versus the amount of frequency tune range (see linearity definition). 9. one or more of the following united states patents apply: 4,616,197; 4,670,681; 4,760,352. 10. over the range of 669.327 mhz 25 ppm and the conditions of note 1. block diagram q v cc buffer amplifier saw oscillator _ v tune q
669.327 mhz optical timing clock rf monolithics, inc. phone: (972) 233-2903 fax: (972) 387-8148 e-mail: info@rfm.com page 2 of 5 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. OP4008B-041003 OP4008B tuning the OP4008B will tune from 0 to 5 volts as shown in the adjacent plot. for normal use in a pll, the tuning voltage will not change much from the nominal oper- ating point. the operating point is determined by: (1) the temperature of the OP4008B case, (2) the refer- ence frequency from the pll, and (3) the internal characteristics of the key components used in the OP4008B part. although the nominal operating point may be different from part to part by up to 1 volt, the locked operation of the part in a pll will not tune more than 0.5 volts, allowing good linearity over the operating range. OP4008B 669 669.1 669.2 669.3 669.4 669.5 669.6 669.7 669.8 0 4 6 mhz tune volts 2 ref holdover xtal loop filter tune +vcc q q n . . typical pll OP4008B rfm's opb-series voltage controlled saw clocks are designed for use in phase lock loops (pll?s) for optical timing ap- plications. pll operating parameters such as loop bandwidth are typically determined by optical timing requirements, and noise reduction demands in a given system. the phase noise in the OP4008B clock is good enough to allow the loop band- width to be set at 100 hz or less. optical timing systems containing multiple or cascaded timing loops have additional con- siderations that apply. for example, jitter peaking is often determined by vco linearity.
669.327 mhz optical timing clock rf monolithics, inc. phone: (972) 233-2903 fax: (972) 387-8148 e-mail: info@rfm.com page 3 of 5 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. OP4008B-041003 load recommendations for the OP4008B the q and q outputs of rfm's opb-series of saw clocks are ac-coupled internally. this allows customers to set the dc level of the outputs with a simple resistor pair on each output to drive most any application. r1 v r1 r2 r2 3.3v v load v op4005b dc load v dc tune 1) 2) v load x r1 r1 + r2 1 + 1 = 1 r1 r2 50 vdc= load type vdc r1 r2 v load 10k 3.3 v pecl 1.95 120 91 3.3 v 100k 3.3 v pecl 1.88 120 91 3.3 v 10k 5 v pecl 3.65 180 68 5.0 v 100k 5 v pecl 3.58 180 68 5.0 v 10k -5 v necl -1.30 240 62 -5.0 v 100k -5 v necl -1.42 240 62 -5.0 v note that the opb parts will drive negative ecl loads by applying negative voltage to the v load points in the circuit. vdc is the dc level desired on the outputs. v load is the dc supply on the load resistors (typically 3.3 v). equations 1 & 2 describe the voltage divider created by r1 & r2 and the equilivent load impedence set by the parrellel com- bination of r1 & r2 . a given load type will have specifications that set vdc . choose an available v load that is 2x to 3x larger than the desired vdc . this will allow r1 to be expressed in terms of r2 as in equation 1. by substituting this result in equation 2, a value for r2 will result. solving equation 1 for r1 with the known r2 is the last step. table 1 has some typical values for vdc & v load for various ecl loads along with r1 & r2 values that are standard.
669.327 mhz optical timing clock rf monolithics, inc. phone: (972) 233-2903 fax: (972) 387-8148 e-mail: info@rfm.com page 4 of 5 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. OP4008B-041003 single sideband phase noise jitter jitter with 200 mv of power supply noise symmetry
669.327 mhz optical timing clock rf monolithics, inc. phone: (972) 233-2903 fax: (972) 387-8148 e-mail: info@rfm.com page 5 of 5 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. OP4008B-041003 smc-8 8-terminal surface mount case dimen- sion mm inches min max min max a 13.46 13.97 0.530 0.550 b 9.14 9.66 0.360 0.380 c 1.93 nominal 0.076 nominal d 3.56 nominal 0.141 nominal e 2.24 nominal 0.088 nominal f 1.27 nominal 0.050 nominal g 2.54 nominal 0.100 nominal h 3.05 nominal 0.120 nominal j 1.93 nominal 0.076 nominal k 5.54 nominal 0.218 nominal l 4.32 nominal 0.170 nominal m 4.83 nominal 0.190 nominal n 0.50 nominal 0.020 nominal a b n j l (x2) d (x8) k (x8) c h g m (x3) e f terminal number connection 1 v cc 2 ground 3 ground 4 q output 5 q output 6 ground 7 8 tune input lid ground 1 2 3 4 8 7 6 5 top view electrical connections typically 0.01" to 0.05" or 0.25 mm to 1.25 mm (8 places) (the optimum value of this dimension is dependent on the pcb assembly process employed.) typical printed circuit board land pattern a typical land pattern for a circuit board is shown below. grounding of the metallic center pad is optional.
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