m685 datasheet rev 0.7 revised 29jul2009 integrated device technology, inc. communication modules www.idt.com tel (508) 852-5400 m685 d ual saw, s electable f requency vcso preliminary information g eneral d escription the m685 is a dual saw, selectable frequency vcso frequency source for low-jitter clock generation. an integrated saw (surface acoustic wave) delay line implements the high-q vco (voltage controlled oscillator) function, which results in low output phase noise and very low jitter. the m685-01 is available in a range of center frequencies from 125 to 177 mhz. the m685-02 provides 500 to 708 mhz. guaranteed minimum pull-range of 120 ppm meets gbe requirements. (it als o fully satisfies 50 ppm minimum pull-range specification commonly required.) industry- standard kvco (vco gain) provides full replacement compatibility. the m685 is we ll suited for phase-locked loop implementations, clock and data recovery circuits, and other timing applications in telecom and optical fiber networking systems (e.g., oc-48). f eatures two integrated saw devices and selectable output frequency; supports multi-rate optical interfaces m685-01 output frequencies from 125 to 177 mhz m685-02 output frequencies from 500 to 708 mhz (specify center frequencies at time of order) industry-standard kvco for full compatibility low phase jitter 0.2ps rms typical for the m685-02 (50khz to 80mhz) differential 3.3v lvpecl output single 3.3v power supply small 5 x 7.5mm smt (s urface mount) package pb-free / compliant to ec rohs directive p in a ssignment (5 x 7.5mm smt) figure 1: pin assignment b lock d iagram figure 2: block diagram sample of available output frequencies vcso center frequencies 1 (mhz) note 1: specify vcso center frequencies at time of order applications 155.5200, 167.3316 sonet/sdh, sonet/sdh fec 156.2500, 161.1328 gigabit ethernet, gbe fec 622.0800, 669.3266 sonet/sdh, sonet/sdh fec 625.0000, 644.5313 gigabit ethernet, gbe fec table 1: sample of ava ilable output frequencies m680 (top view) 1 2 34 5 6 vin f _sel vcc nfo u gnd fou t m685 f_sel vin nfout saw delay line phase shifter m685 vcso fout saw delay line phase shifter vcso m685 dual saw, selectable frequency vcso
m685 datasheet rev 0.7 2 of 7 revised 29jul2009 integrated device technology, inc. communication modules www.idt.com tel (508) 852-5400 m685 d ual saw, s electable f requency vcso preliminary information p in d escriptions number name i/o configuration description 1vin input frequency control input. 2 f_sel input internal pull-down resistor 1 frequency select: logic 1 selects frequency 2 . logic 0 selects frequency 1 . 3gnd ground power supply ground connection. 4 5 fout nfout output no internal terminator clock output pair. differential lvpecl. 6vcc power power supply connection, connect to + 3.3 v. table 2: pin descriptions note 1: see ?frequency select? in table 5 (dc characteristics fo r m685-01 on pg. 3) and table 7 (dc characteristics for m685-02 on pg. 4). a bsolute m aximum r atings 1 note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these ratings are stress s pecifications only. functional operat ion of product at these conditions or any conditions beyond those li sted in recommended conditions of operation, dc characteristics, or ac characteristics is not implied. exposure to absolute maximum rating condi tions for extended periods may affect product reliability . symbol parameter rating unit v i inputs - 0.5 to v cc + 0.5 v v o outputs - 0.5 to v cc + 0.5 v v cc power supply voltage 4.6 v t s storage temperature - 55 to + 125 o c table 3: absolute maximum ratings r ecommended c onditions of o peration symbol parameter min typ max unit v cc positive supply voltage 2.97 3.3 3.63 v t a ambient operating temperature - 40 25 + 85 o c table 4: recommended c onditions of operation
m685 datasheet rev 0.7 3 of 7 revised 29jul2009 integrated device technology, inc. communication modules www.idt.com tel (508) 852-5400 m685 d ual saw, s electable f requency vcso preliminary information e lectrical s pecifications for m685-01 dc characteristics for m685-01 unless stated otherwise, v cc = 3.3 volts + 10%, t a = 0 to 85 o c, vcso freq.?s = 155.52, 167.3316mhz, outputs terminated into 180 ? to ground symbol parameter pin min typ max unit power supply v cc positive supply voltage vcc 2.97 3.3 3.63 v i cc power supply current 90 125 ma control voltage v in input control voltage range vin 0 3.3 v v in input impedence 100 k ? frequency select 1 note 1: internally pulled down to logi c 0 (frequency 1) if left unselected. v ih input high voltage f_sel 2 v cc + 0.3 v v il input low voltage - 0.3 0.8 v i ih input high current 5 a i il input low current -1 50 a r pulldown internal pull-down resistor 51 k ? differential outputs v oh output high voltage fout, nfout v cc - 0.98 v cc - 0.75 v v ol output low voltage v cc - 1.95 v cc - 1.63 v v p - p peak to peak output voltage 2 note 2: single-ended measurement. see figure 3, output rise and fall time, on pg. 5. 0.450 0.625 0.85 v p - p i out output current 20 ma table 5: dc characteristics for m685-01 ac characteristics for m685-01 unless stated otherwise, v cc = 3.3 volts + 10%, t a = 0 to 85 o c, vcso freq.?s = 155.52, 167.3316mhz, outputs terminated into 180 ? to ground symbol parameter min typ max unit notes control voltage v in modulation bandwidth vin 600 khz output f out output center frequency range m685-01 125 177 mhz apr absolute (guaranteed) pull-range 1 note 1: also fully meets 50 ppm minimum pull -range specification that is commonly required. 120 ppm f stab frequency stability 100 ppm p-p at any givin v in l in tuning linearity 6 % v in = 0.3 to 3.0 v best fit straight line k vco vco gain @ 155.52 mhz 400 ppm/v v in = 0.3 to 3.0 v non-harmonic spurious -50 -77 dbc n ssb (single sideband) phase noise, offset from carrier @ 155.52 mhz 100hz offset -48 dbc/hz 1khz offset -75 dbc/hz 10khz offset -99 dbc/hz 100khz offset -124 dbc/hz 1mhz offset -142 dbc/hz j(t) jitter (rms) @ 155.52 mhz 12khz to 20mhz 0.30 ps rms 50khz to 80mhz 0.18 ps rms odc output duty cycle 2 note 2: see parameter measurement information on pg. 5. 45 55 % t r output rise time 2 for fout, nfout 275 425 ps 20 % to 80 % t f output fall time 2 for fout, nfout 275 425 ps 20 % to 80 % table 6: ac characteristics for m685-01
m685 datasheet rev 0.7 4 of 7 revised 29jul2009 integrated device technology, inc. communication modules www.idt.com tel (508) 852-5400 m685 d ual saw, s electable f requency vcso preliminary information e lectrical s pecifications for m685-02 dc characteristics for m685-02 unless stated otherwise, v cc = 3.3 volts + 10%, t a = 0 to 85 o c, vcso freq.?s = 622.08, 669.3266mhz, outputs terminated into 180 ? to ground symbol parameter pin min typ max unit power supply v cc positive supply voltage vcc 2.97 3.3 3.63 v i cc power supply current 90 125 ma control voltage v in input control voltage range vin 0 3.3 v v in input impedence 100 k ? frequency select 1 note 1: internally pulled down to logi c 0 (frequency 1) if left unselected. v ih input high voltage f_sel 2 v cc + 0.3 v v il input low voltage - 0.3 0.8 v i ih input high current 5 a i il input low current -1 50 a r pulldown internal pull-down resistor 51 k ? differential outputs v oh output high voltage fout, nfout v cc - 0.98 v cc - 0.75 v v ol output low voltage v cc - 1.95 v cc - 1.63 v v p - p peak to peak output voltage 2 note 2: single-ended measuremen t. see figure 3, output rise and fall time, on pg. 5. 0.450 0.625 0.85 v p - p i out output current 20 ma table 7: dc characteristics for m685-02 ac characteristics for m685-02 unless stated otherwise, v cc = 3.3 volts + 10%, t a = 0 to 85 o c, vcso freq.?s = 622.08, 669.3266mhz, outputs terminated into 180 ? to ground symbol parameter min typ max unit notes control voltage v in modulation bandwidth vin 600 khz output f out output center frequency range m685-02 500 708 mhz apr absolute (guaranteed) pull-range 1 note 1: also fully meets 50 ppm minimum pull -range specification that is commonly required. 120 ppm f stab frequency stability 100 ppm p-p at any givin v in l in tuning linearity 6 % v in = 0.3 to 3.0 v best fit straight line k vco vco gain @ 622.08 mhz 400 ppm/v v in = 0.3 to 3.0 v non-harmonic spurious -50 -77 dbc n ssb (single sideband) phase noise, offset from carrier @ 622.08 mhz 100hz offset -42 dbc/hz 1khz offset -72 dbc/hz 10khz offset -102 dbc/hz 100khz offset -127 dbc/hz 1mhz offset -146 dbc/hz j(t) jitter (rms) @ 622.08 mhz 12khz to 20mhz 0.22 ps rms 50khz to 80mhz 0.16 ps rms odc output duty cycle 2 note 2: see parameter measurement information on pg. 5. 45 55 % t r output rise time 2 for fout, nfout 275 400 ps 20 % to 80 % t f output fall time 2 for fout, nfout 275 400 ps 20 % to 80 % table 8: ac characteristics for m685-02
m685 datasheet rev 0.7 5 of 7 revised 29jul2009 integrated device technology, inc. communication modules www.idt.com tel (508) 852-5400 m685 d ual saw, s electable f requency vcso preliminary information p arameter m easurement i nformation output rise and fall time figure 3: output rise and fall time output duty cycle figure 4: output duty cycle d evice p ackage - 5 x 7.5mm smt (s urface mount) package mechanical dimensions: figure 5: device package - 5 x 7.5mm smt (surface mount) package 20% 80% t r 20% t f 80% clock outputs v p-p t pw t period (output pulse width) t period t pw odc = nfout fout dimensions are in mm; dimensions in [ ] are in inches unless otherwise specified, all dimensions are 0.13 [0.005] m685 -02-aa-ah
m685 datasheet rev 0.7 6 of 7 revised 29jul2009 integrated device technology, inc. communication modules www.idt.com tel (508) 852-5400 while the information presented herein has been checked for both accuracy and reliabi lity, integrated circuit systems (ics) assumes no responsibility for either its use or for the infringemen t of any patents or other rights of third parties, which wou ld result from its use. no other ci rcuits, patents, or licenses are implied. this product is intended for use in normal commercial applications. any other applications such as those requiring extended te mperature range, high reliability, or other extraordina ry environmental requirements are not recomm ended without additional processing by ics. ics reserves the right to change any circuitry or specifications without notice. ics does not authorize or warrant any ics product for use in life support devices o r critical medical instruments. m685 d ual saw, s electable f requency vcso preliminary information o rdering i nformation part numbering scheme figure 6: part numbering scheme example order numbers m685-01 standard output frequencies & order codes m685-02 standard output frequencies & order codes consult idt for the avail ability of other frequencies for output frequencies (mhz) frequency 1 , frequency 2 order part number m685-0 y - xx - xx 155.5200, 167.3316 m685-01-ba-bh 156.2500, 161.1328 m685-01-bb-bd 622.0800, 669.3266 M685-02-AA-AH 625.0000, 644.5313 m685-02-ab-ad table 9: example order numbers m685 part number: m680-01 - xx -xx see tables 10 and 11 at right for frequency order codes. device number consult ics for other frequencies and order codes. m685 variant -01 = output frequencies 125 - 177 mhz -02 = output frequencies 500 - 708 mhz -0y output frequency 1 order code output frequency 2 order code 125.0000 da 168.0407 bj 155.5200 ba 172.6423 bk 156.2500 bb 173.3708 bl 156.8324 bc 164.3555 bm 161.1328 bd 153.6000 bo 166.6286 be 118.7500 bp 167.2820 bf 176.8382 bq 167.3280 bg 156.1762 br 167.3316 bh 174.1537 bu 167.7097 bi 174.7031 bv table 10: m685-01 standard ou tput frequencies & order codes 500.0000 ca 672.1627 aj 622.0800 aa 690.5692 ak 625.0000 ab 693.4830 al 627.3296 ac 657.4219 am 644.5313 ad 614.4000 ao 666.5143 ae 475.0000 ap 669.1281 af 707.3527 aq 669.3120 ag 624.7048 ar 669.3266 ah 696.6149 au 670.8386 ai 698.8123 av table 11: m685-02 standard ou tput frequencies & order codes
m685 datasheet rev 0.7 - errata revised 29jul2009 integrated device technology, inc. communication modules www.idt.com tel (508) 852-5400 m685 d ual saw, s electable f requency vcso errata p roduct a pplication c aution f_sel change during power-up can affect output frequency accuracy m685e1 the m685 features an f_sel input which is used to select the internal vcso frequency. the f_sel input logic level should not be changed while the m685 device is in operation (that is, voltage is applied to the pin vcc ), particularly when the pin vin (the control voltage input) is above 2.0v. changing the f_sel input logic level during operation may result in an erroneous output frequency. it is safe to change f_sel during operation if pin vin can be held low, or at least below 2.0v.
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