vectron international 267 lowell rd, hudson nh 03051 tel:1-88-vectron-1 e-mail: vectron@vectron.com s-type voltage controlled crystal oscillator the s-type voltage controlled crystal oscillator block diagram figure 1 features ? output frequencies to 65.536mhz ? 5 or 3.3 vdc operation ? tri-state output ? low jitter < 6ps rms (for freq >12mhz) ? vcxo with cmos outputs ? 0/70 or ?40/85 c temperature range ? hermetically sealed ceramic smd package product is free of lead and compliant to ec rohs directive applications ? sonet/sdh ? xdsl ? digital video ? low jitter pll?s description the vi s-type voltage controlled crystal oscillator (vcxo) is a quartz stabilized square wave generator with a cmos output and is tested at cmos (3.3 and 5v operation) and ttl (5 v operation) logic levels. devices are tested for absolute pull range (apr) and start-up over the operating temperature range which insures the performance and reliability. vc f o output buffer / tri state input buffer esd diodes
s-type voltage controlled crystal oscillator vectron international 267 lowell rd, hudson nh 03051 tel:1-88-vectron-1 e-mail: vectron@vectron.com performance characteristics table 1. electrical performance parameter symbo l min typical maximum units supply voltage 1 (+5 or +3.3 v) v dd 0.9*v dd 1.1*v dd v supply current i dd 10ma +0.25ma/mhz ma output logic levels output logic high 2 output logic low 2 v oh v ol 0.8*v dd 0.1v dd v v transition times rise time 2 fall time 2 t r t f 5 5 ns ns symmetry or duty cycle 3 sym 45/55 % nominal output frequency options f o 1.024 65.536 mhz test conditions for apr (+5v option) v c 0.5 4.5 v test conditions for apr (+3.3v option) v c 0.3 3.0 v absolute pull range ( ordering option ) apr 50,80 or 100 ppm gain transfer positive operating temperature ( ordering option ) 0/70 or ?40/85 c control voltage leakage current i vcxo 1 ua control voltage bandwidth (-3db) bw 10 khz 1. a 0.01uf capacitor should be located as close to the supply as possible (to gr ound) and a 0.1uf is also recommended. 2. figure 1 defines these parameters. figure 2 illustrates the equivalent five gate ttl l oad and operating conditions under wh ich these parameters are tested and specified. 3. symmetry is defined as (on time/period with vs=-1.4 v for ttl and vs=2.5 v for cmos, 5 volt operation, and vs=1.65v for 3.3 volt operation. ttl/cmos pin should be grounded for frequencies <12mhz. figure 2. output waveform figure 3. output test conditions (25 5c) absolute maximum ratings stresses in excess of the absolute maximum rati ngs can permanently damage the device. functional operation is not implied at these or any other c onditions in excess of conditions represented in the operational sections of this data sheet. exposure to absolute maximum ratings for extended periods may adversely affect device reliability. table 2. absolute maximum ratings parameter symbol ratings unit power supply v dd 7 vdc storage temperature tstorage -55/125 c voltage control range v c 0 to v dd v 80 % 50% 20 % t f t r period on time + - + - i c v c 4 3 . 1 f .01 f 15pf 25 6 1 i dd 650 ? v dd 1.8k
s-type voltage controlled crystal oscillator vectron international 267 lowell rd, hudson nh 03051 tel:1-88-vectron-1 e-mail: vectron@vectron.com qualification conformance the s-type has undergone the following mil-std qualification. table 3. environmental compliance parameter conditions mechanical shock mil-std-883c 2002.3, test b mechanical vibration mil-std-883c 2007.1, test c solderability mil-std-883c 2003.5 gross and fine leak mil-std-883c 1014.7, 100% tested resistance to solvents mil-std-883c 2016 handling precautions although esd protection circuitrry has been designed in to the the s-type, proper precautions should be taken when handling and mounting. vi employs a human body model and a charged-device model (cdm) for esd susceptibility testing and design protecti on evaluation. esd thresholds are dependent on the circuit parameters used to define the model. al though no industry wide standard has been adopted for the cdm, a standard hbm of resistanc e=1.5kohms and capacitance = 100pf is widely used and therefore can be used for comparison purposes. table 4. esd ratings model minimum human body model 1500 v (mil-std-883d, method 3015, class 1) charged device model 1500 v absolute pull range (apr) specification the frequency deviation of the s-type vcxo is specified in terms of absolute pull range (apr). apr provides the user with a guaranteed specification for minimum available frequency deviation over all operating conditions. operating conditions include operat ing temperature range, power supply variation, differences in output loading and changes due to aging. an s-type vcxo with an apr of +/-50 ppm will track a +/-50 ppm reference source over all operating conditions. the same device will typically demonstrate a total pull capability of 150 to 350 ppm. absolute pull range (apr) is specified by the f ourth character of the product code in table 6. please see vectron?s web site, www.vectron.com , for the apr application note. oscillator aging quartz stabilized oscillators typically exhibit a sm all shift in output frequency during aging. the major factors which lead to this shift are changes in t he mechanical stress on the crystal and mass-loading of foreign material on the crystal. as the oscillator ages, relaxation of the crystal mounting stress or transfe r of environmental stress through the package to the crystal mounting arr angement can lead to frequency variations. vi has minimized these two effects through the use of a miniat ure at-cut strip resonator crystal which allows a superior mounting arrangement and results in minima l relaxation and almost negligible environmental stress transfer.
s-type voltage controlled crystal oscillator vectron international 267 lowell rd, hudson nh 03051 tel:1-88-vectron-1 e-mail: vectron@vectron.com 25 217 200 150 260 temperature (degc) time (sec) t s t amb-p t l t p r up r dn oscillator aging mass-loading on the crystal generally results in a frequency decrease and is typically due to out-gassing of material within a hermetic package or from contam ination by external material in a less than hermetic package. vi has minimized the impact of mass loadi ng by ensuring hermetic integrity and minimizing out- gassing by limiting the number of internal com ponents through the use of asic technology. under normal operating conditions with an operating tem perature of 40c, the s-ty pe will typically exhibit 2 ppm aging in the first year of operation. the dev ice will then typically exhibit 1 ppm aging the following year with a logarithmic decline each year thereafter. figure 4. suggested ir profile figure 5. tape and reel
s-type voltage controlled crystal oscillator vectron international 267 lowell rd, hudson nh 03051 tel:1-88-vectron-1 e-mail: vectron@vectron.com figure 6. outline diagram
s-type voltage controlled crystal oscillator vectron international 267 lowell rd, hudson nh 03051 tel:1-88-vectron-1 e-mail: vectron@vectron.com table 5. pin function pin symbol function 1 v c vcxo control voltage 2 tri-state ttl low to disable output. ttl high, or no connect, to enable output. 3 gnd case ground 4 output vcxo output 5 ttl/cmos ttl logic low for cmos optimized symmetry. ttl logic high, or no connect, for ttl optimized symmetry. 6 v dd power supply voltage (3.3 v 10% or 5.0 v 10%) ordering information table 6. standard frequencies 1.024 1.544 2.000 2.048 3.088 3.580 3.686 4.000 4.032 4.096 4.434 5.000 5.760 6.144 6.176 6.312 6.400 8.000 8.192 8.448 9.192 10.000 11.000 11.2896 11.290 12.000 12.288 12.352 12.900 13.000 13.500 14.318 15.360 15.440 16.000 16.123 16.384 17.734 18.432 19.440 19.985 20.000 20.480 24.000 24.576 24.704 27.000 30.000 32.000 32.768 34.368 35.328 38.880 40.000 40.960 44.736 50.000 51.840 52.000 other frequencies may be available upon request table 7. part number ordering information s g u g l a - 44.736 (frequency in mhz) package size symmetry s-type a: 45/55% supply voltage temperature range t: thru hole c: 0 to 70 c g: gull wing l: -40 to 85 c e: 0 to 85 c output, symmetry absolute pull range (stability xo) u: vcxo, +5v, standard linearity g: 50 ppm l: vcxo, +5v, 10% linearity n: 80 ppm m: vcxo, +5v, 20 ppm temper ature stability h: 100 ppm d: vcxo, +3.3v, standard linearity k: vcxo, +3.3v, 10% linearity f: xo, +5v www.vectron.com vectron international reserves the right to make changes to the product(s) and/or in formation contained her ein without notice. no liability is assumed as a result of their use or app lication. no rights under any patent accompany the sale of any su ch product(s) or information. stype.doc (revision date: 10/15/10) for additional information, please contact: usa: vectron international ? 267 lowell rd, hudson nh 03051 ? tel: 1-88-vectron-1 ? fax: 1-888-fax-vectron europe: in denmark, finland, ireland, israel, norway, spain, uk: tel: 44 (0) 1703 766 288 ? fax: 44 (0) 1703 766 822 in austria,belgium,france,germany,italy, luxenburg,netherlands,sweden,switzerland:tel: 49(0)7263 6480 ? fax:49(0)7263 6196 asia: in china, taiwan, japan: tel: 01 603 598 0070 ? fax: 01 603 598 0075 in korea, singapore, australia, india: tel: 01 203 853 4433 ? fax: 01 203 853 1423
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