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AK8185A draft-e-02 dec. 2012 - 1 - - features - low phase noise pll rms jitter 0.4ps typ. (12khz to 20mhz) on chip vco 4x output available pin-selectable lvpecl, lvds, or 2-lvcmos lvcmos bypass output available 3.3v for core operating temperature range: -40 to +85 pin package: 5mm x 5mm 32-pin leadless qfn (pb-free) - description - AK8185A is a low ? jitter clock generator with sub pico-second jitter performance. also low power consumption is the advantage for advanced optimized application. - application - ethernet sonet fibre channel san cost-effective high-frequ ency crystal oscillator replacement - block diagram - phase frequency detector vcc_vco vcc_vdd xin charge pump xo / lvcmos loop filter vco vcc_out vcc_pll2 vcc_pll1 vcc_in lvpecl lvcmos lvds lvpecl lvcmos lvds lvpecl lvcmos lvds lvpecl lvcmos lvds prescaler divider +3 +4 +5 rstn lvcmos output driver feedback divider +25 +24 +20 +15 . . . output divider +1 +6 +8 +4 pr[1...0] od[2...0] os[1...0] input frequency range: 21.875mhz-28.47mhz output frequency range: 43.75mhz-683.264mhz low - jitter clock generator with integrated vco AK8185A fi g . 1 -preliminary-
AK8185A draft-e-02 dec. 2012 - 2 - - pin assignments - (top view) v cc _out outn1 outp1 v cc _out ce 3 4 7 5 2 1 outn0 6 outp0 8 nc v cc _pll2 od1 od0 rstn os0 os1 v cc _vco 10 14 16 15 od2 9 11 13 12 v cc _pll1 osc_out xin v cc _in reg_cap2 gnd1 23 21 22 19 17 18 24 reg_cap1 20 nc outn2 v cc _out outp3 outn3 pr1 pr0 26 32 28 30 29 31 25 outp2 v cc _out 27 AK8185A thermal pad (must be soldered to ground) fi g . 2
AK8185A draft-e-02 dec. 2012 - 3 - - pin descriptions - pin no. pin name pin type description 1 v cc _out pwr 3.3v power supply for output buffers 2 outn1 out differential output pair or two single-ended outputs 3 outp1 out differential output pair or two single-ended outputs 4 v cc _out pwr 3.3v power supply for output buffers 5 outn0 out differential output pair or two single-ended outputs 6 outp0 out differential output pair or two single-ended outputs 7 ce in chip enable control pin 8 nc no connection 9 v cc _vco pwr 3.3v power supply for internal vco 10 os1 in output type select control pin 11 os0 in output type select control pin 12 rstn in device reset (active low) 13 od0 in output divider control pins 14 od1 in output divider control pins 15 od2 in output divider control pins 16 v cc _pll2 pwr 3.3v power supply for pll circuitry 17 reg_cap2 out capacitor for internal regulator (connect to a 10- f y5v capacitor to gnd) 18 v cc _pll1 pwr 3.3v power supply for pll circuitry 19 reg_cap1 out capacitor for internal regulator (connect to a 10- f y5v capacitor to gnd) 20 v cc _in pwr 3.3v power supply for input buffers 21 xin in parallel resonant crystal or lvcmos inputs 22 gnd1 ground additional ground for device 23 osc_out out bypass lvcmos output 24 nc no connection 25 pr0 in prescaler and feedback divider control pins 26 pr1 in prescaler and feedback divider control pins 27 v cc _out pwr 3.3v power supply for output buffers 28 outn3 out differential output pair or two single-ended outputs 29 outp3 out differential output pair or two single-ended outputs 30 v cc _out pwr 3.3v power supply for output buffers 31 outn2 out differential output pair or two single-ended outputs 32 outp2 out differential output pair or two single-ended outputs epad gnd ground thermal pad (must be soldered to ground)
AK8185A draft-e-02 dec. 2012 - 4 - absolute maximum rating over operating free-air temperat ure range unless otherwise noted (1) parameter value unit supply voltage range (v _out, vcc_ pll1 ,vcc_ pll2 , vcc_ vco , vcc_ in ) -0.3 to 4.3v v input voltage range gnd-0.3 to v cc +0.3 v input current range -10 to +10 ma storage temperature -55to 125 ? c note (1) stress beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only. functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating conditions? is not implied. exposure to absolute-maximum-rating conditions for extended periods may affect device reliabi lity. electrical parameters are guaranteed only over the recommended operating temperature range. this device is manufactured on a cmos proce ss, therefore, generically susceptible to damage by excessive static voltage. fa ilure to observe proper handling and installation procedures can cause damage. akm recommends that this device is handled with appropriate precautions. recommended operating conditions parameter symbol min typ max unit output supply voltage v _out 3.0 3.3 3.6 v pll supply voltage vcc_ pll1 3.0 3.3 3.6 v pll supply voltage vcc_ pll2 3.0 3.3 3.6 v on-chip vco supply voltage vcc_ vco 3.0 3.3 3.6 v input supply voltage vcc_ in 3.0 3.3 3.6 v ambient temperature ta -40 85 ? c esd sensitive device
AK8185A draft-e-02 dec. 2012 - 5 - electrical characteristics all specifications at vdd=vdd_lvds=vcp= 3.3v ? 5%, ta: -40 to +85 , unless otherwise noted parameter conditions min typ max unit control pin lvcmos input characteristics input high voltage (v ih ) 0.6vcc v input low voltage (v il ) 0.4vcc v input high current (i ih ) 200 ua input low current (i il ) -200 ua lvcmos output characteristics bypass output frequency 21.875 28.47 mhz output frequency 43.75 250 mhz output high voltage vcc-0.5 v output low voltage 0.3 rms phase jitter 250mhz (10khz to 20mhz) 0.4 ps, rms output rise/fall slew rate 20% ? 80% 2.4 output duty cycle 45 55 % skew between outputs 10 ps lvpecl output characteristics output frequency 43.75 683.264 mhz output high voltage vcc-1.18 vcc-0.73 v output low voltage vcc-2 vcc-1.55 v differential output voltage 0.6 1.23 v rms phase jitter 625mhz (10khz to 20mhz) 0.4 ps, rms output rise/fall slew rate 20% ? 80% 175 ps output duty cycle 45 55 % skew between outputs 10 ps lvds output characteristics output frequency 43.75 683.264 mhz differential output vo ltage 0.247 0.454 v magnitude change 50 mv common-mode voltage 1.125 1.375 v magnitude change 50 mv rms phase jitter 625mhz (10khz to 20mhz) 0.4 ps, rms output rise/fall time 20% ? 80% 255 ps output duty cycle 45 55 % skew between outputs 10 ps
AK8185A draft-e-02 dec. 2012 - 6 - typical output phase noise characteristics all specifications at vdd=vdd_lvds=vcp= 3.3v ? 5%, ta: -40 to +85 , unless otherwise noted parameter conditions min typ max unit 250mhz lvcmos input characteristics phase noise @ 100hz offset -85 dbc/hz @ 1khz offset -113 dbc/hz @ 10khz offset -123 dbc/hz @ 100khz offset -125 dbc/hz @ 1mhz offset -136 dbc/hz @ 10mhz offset -154 dbc/hz @ 20mhz offset -154 dbc/hz rms phase jitter 10khz to 20mhz 384 ps, rms 625mhz lvpecl output characteristics phase noise @ 100hz offset -77 dbc/hz @ 1khz offset -105 dbc/hz @ 10khz offset -114 dbc/hz @ 100khz offset -117 dbc/hz @ 1mhz offset -128 dbc/hz @ 10mhz offset -150 dbc/hz @ 20mhz offset -151 dbc/hz rms phase jitter 10khz to 20mhz 387 ps, rms 625mhz lvds output characteristics phase noise @ 100hz offset -77 dbc/hz @ 1khz offset -105 dbc/hz @ 10khz offset -114 dbc/hz @ 100khz offset -117 dbc/hz @ 1mhz offset -127 dbc/hz @ 10mhz offset -150 dbc/hz @ 20mhz offset -152 dbc/hz rms phase jitter 10khz to 20mhz 395 ps, rms
AK8185A draft-e-02 dec. 2012 - 7 - crystal characteristics parameter min typ max unit frequency 21.875 28.47 mhz equivalent series resistance 50 on-chip load capacitance 8 10 pf drive level 0.1 1 mw maximum shunt capacitance 7 pf
AK8185A draft-e-02 dec. 2012 - 8 - device ? configuration ? common ? configuration ? ? ? input ? ? [mhz] ? prescaler ? divider ? feedback ? divider ? vco ? frequency ? [mhz] ? output ? divider output ? frequency ? ? [mhz] ? application ? 25 ? 4 ? 20 ? 2000 ? 8 ? 62.5 ? gige ? 24.75 ? 3 ? 24 ? 1782 ? 8 ? 74.25 ? hdtv ? 25 ? 3 ? 24 ? 1800 ? 8 ? 75 ? sata ? 24.8832 ? 3 ? 25 ? 1866.24 ? 8 ? 77.76 ? sonet ? 25 ? 3 ? 24 ? 1800 ? 6 ? 100 ? pci ? express ? 26.5625 ? 3 ? 24 ? 1912.5 ? 6 ? 106.25 ? fiber ? channel ? 25 ? 4 ? 20 ? 2000 ? 4 ? 125 ? gige ? 25 ? 3 ? 24 ? 1800 ? 4 ? 150 ? sata ? 24.8832 ? 3 ? 25 ? 1866.24 ? 4 ? 155.52 ? sonet ? 25 ? 3 ? 25 ? 1875 ? 4 ? 156.25 ? 10 ? gige ? 26.5625 ? 3 ? 24 ? 1912.5 ? 4 ? 159.375 ? 10 \ g ? fiber ? channel 25 ? 5 ? 15 ? 1875 ? 2 ? 187.5 ? 12 ? gige ? 25 ? 3 ? 24 ? 1800 ? 3 ? 200 ? pci ? express ? 26.5625 ? 3 ? 24 ? 1912.5 ? 3 ? 212.5 ? 4 \ g ? fiber ? channel ? 25 ? 4 ? 20 ? 2000 ? 2 ? 250 ? gige ? 24.8832 ? 3 ? 25 ? 1866.24 ? 2 ? 311.04 ? sonet ? 25 ? 3 ? 25 ? 1875 ? 2 ? 312.5 ? xgmii ? 24.8832 ? 3 ? 25 ? 1866.24 ? 1 ? 622.08 ? sonet ? 25 ? 3 ? 25 ? 1875 ? 1 ? 625 ? 10 ? gige ?
AK8185A draft-e-02 dec. 2012 - 9 - generic configuration programmable prescaler and feedback divider settings input frequency range [mhz] prescaler divider feedback divider vco frequency [mhz] output divider output frequency [mhz] 21.875 ? to ? 25.62 ? 4 ? 20 ? 1750 ? to ? 2050 ? 8 ? 54.6875 ? to ? 64.05 ? 21.875 ? to ? 25.62 ? 4 ? 20 1750 ? to ? 2050 6 ? 72.92 ? to ? 85.4 ? 21.875 ? to ? 25.62 ? 4 ? 20 1750 ? to ? 2050 4 ? 109.375 ? to ? 128.1 ? 21.875 ? to ? 25.62 ? 4 ? 20 1750 ? to ? 2050 3 ? 145.84 ? to ? 170.8 ? 21.875 ? to ? 25.62 ? 4 ? 20 1750 ? to ? 2050 2 ? 218.75 ? to ? 256.2 ? 21.875 ? to ? 25.62 ? 4 ? 20 1750 ? to ? 2050 1 ? 437.5 ? to ? 512.4 ? 23.33 ? to ? 27.33 ? 3 ? 25 ? 1750 ? to ? 2050 8 ? 72.906 ? to ? 85.408 ? 23.33 ? to ? 27.33 ? 3 ? 25 1750 ? to ? 2050 6 ? 97.21 ? to ? 113.875 ? 23.33 ? to ? 27.33 ? 3 ? 25 1750 ? to ? 2050 4 ? 145.821 ? to ? 170.816 ? 23.33 ? to ? 27.33 ? 3 ? 25 1750 ? to ? 2050 3 ? 194.42 ? to ? 227.75 ? 23.33 ? to ? 27.33 ? 3 ? 25 1750 ? to ? 2050 2 ? 291.624 ? to ? 341.632 ? 23.33 ? to ? 27.33 ? 3 ? 25 1750 ? to ? 2050 1 ? 583.248 ? to ? 683.264 ? 23.33 ? to ? 27.33 ? 5 ? 15 ? 1750 ? to ? 2050 8 ? 43.75 ? to ? 51.25 ? 23.33 ? to ? 27.33 ? 5 ? 15 1750 ? to ? 2050 6 ? 58.33 ? to ? 68.33 ? 23.33 ? to ? 27.33 ? 5 15 1750 ? to ? 2050 4 ? 87.5 ? to ? 102.5 ? 23.33 ? to ? 27.33 ? 5 15 1750 ? to ? 2050 3 ? 116.66 ? to ? 136.66 ? 23.33 ? to ? 27.33 ? 5 15 1750 ? to ? 2050 2 ? 175 ? to ? 205 ? 23.33 ? to ? 27.33 ? 5 15 1750 ? to ? 2050 1 ? 350 ? to ? 410 ? 24.305 ? to ? 28.47 ? 3 ? 24 ? 1750 ? to ? 2050 8 ? 72.915 ? to ? 85.41 ? 24.305 ? to ? 28.47 ? 3 ? 24 1750 ? to ? 2050 6 ? 97.22 ? to ? 113.88 ? 24.305 ? to ? 28.47 ? 3 ? 24 1750 ? to ? 2050 4 ? 145.83 ? to ? 170.82 ? 24.305 ? to ? 28.47 ? 3 ? 24 ? 1750 ? to ? 2050 3 ? 194.44 ? to ? 227.76 ? 24.305 ? to ? 28.47 ? 3 ? 24 1750 ? to ? 2050 2 ? 291.66 ? to ? 341.64 ? 24.305 ? to ? 28.47 ? 3 ? 24 1750 ? to ? 2050 1 ? 583.32 ? to ? 683.28 ? control inputs prescaler divider feedback divider pfd frequency pr1 ? pr0 ?? ? minimum ? maximum ? 0 ? 0 ? 3 ? 24 ? 24.305 ? 28.47 ? 0 ? 1 ? 5 15 23.33 ? 27.33 ? 1 ? 0 ? 3 25 23.33 ? 27.33 ? 1 ? 1 ? 4 20 21.875 ? 25.62 ?
AK8185A draft-e-02 dec. 2012 - 10 - programmable output divider settings ? ? programmable output type ? ? output enable ? ? reset ? control ? inputs ?? output ? divider od2 ? od1 ? od0 ?? 0 ? 0 ? 0 ? 1 ? 0 ? 0 ? 1 ? 2 ? 0 ? 1 ? 0 ? 3 ? 0 ? 1 ? 1 ? 4 ? 1 ? 0 ? 0 ? reserved ? 1 ? 0 ? 1 ? 6 ? 1 ? 1 ? 0 ? reserved ? 1 ? 1 ? 1 ? 8 ? ? control ? inputs ?? os1 ? os0 ? output ? type ? 0 ? 0 ? lvcmos, ? osc_out ? off 0 ? 1 ? lvds, ? osc_out ? off ? 1 ? 0 ? lvpecl, ? osc_out ? off ? 1 ? 1 ? lvpecl, ? osc_out ? on ? ? control ? inputs ?? ce ? operating ? condition output ?? 0 ? power ? down ? hi \ z ? 1 ? normal ? active ? ? control ? inputs ?? rstn _____ ? operating ? condition output ?? 0 ? device ? reset ? hi \ z ? 0 ? 1 ? pll ? recalibration ? hi \ z ? 1 ? normal ? active ?
AK8185A draft-e-02 dec. 2012 - 11 - package information ? mechanical data ? rohs compliance all integrated circuits form asahi kasei microdevices corporation (akm) assembled in ?lead-free? packages* are fully compliant with rohs. (*) rohs compliant products from akm are identified with ?pb free? letter indication on product label posted on the anti-shield bag and boxes.
AK8185A draft-e-02 dec. 2012 - 12 - important notice ? these products and their specifications are subject to change without notice. when you consider any use or application of these products, please make inquiries the sales office of asahi kasei microdevic es corporation (akm) or authori zed distributors as to current status of the products. ? akm assumes no liability for infringement of any patent, intellectual propert y, or other rights in the application or use of any information contained herein. ? any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, curren cy exchange, or strategic materials. ? akm products are neither intended nor authorized for use as critical components note1) in any safety, life support, or other hazard related device or system note2) , and akm assumes no responsibility for such use, except for the us e approved with the expr ess written consent by representative director of akm. as used here: note1) a critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly , in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. note2) a hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perf orm may reasonably be expected to result in loss of life or in significant injury or damage to person or property. ? it is the responsibility of the buyer or distributo r of akm products, who distributes, disposes of, or otherwise places the product with a third party, to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold akm harmless from any and all claims arising from the use of said product in the absence of such notification.

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