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1 of 18 proprietary & confidential GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 GN2014A xfp tx signal cond itioner with vcsel driver www.gennum.com features ? xfp datacom compliant tran smit signal conditioner ? integrated vcsel driver with cross point adjust functionality to optimi ze optical performance ? single 3.3v supply ? power dissipation: 300mw (typical, assuming 700mvppd data output amplitude) ? multi-rate operation: 9.95gb/s ? 11.3gb/s ? no reference clock required ? laser shut down option ? automatic input offset correction ? on chip 100 differential i/o termination ? loss of lock indicator ? loopback differential output ? cdr bypass option ? bit inversion capability applications ? transmit path signal conditioner for xfp and sfp+ transceiver modules general description the GN2014A is a transmit path signal cond itioner with integrated vcsel driver designed to offer power and cost savings relative to external laser driver solutions. the GN2014A provides integrated modulation and eye shaping capability while maintaining pin compatibility with previous generation parts. figure a: GN2014A block diagram figure b: typical usage phase detector vco charge pump/ loop filter lbwctrl lf lben polinv sdop sdo buf sdon mux 1 0 s equalizer eqip eqin dc offset correction circuit rten d q clk lock detector inverter lbo buf lbop lbon swngsel cpa cpapol lddisable los circuit (note 1) lol los note 1: the los threshold is set by defualt to 100mvppd. 10 gb /s 10 gb /s s erde s / a s i c xfp module line c ard photo diode la s er diode tia g n1052 g n2003 s g n2014a 10 gb /s 10 gb /s s erde s / a s i c xfp module line c ard la s er diode g n2014a tia g n1052 photo diode g n2003 s
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 2 of 18 proprietary & confidential contents features....................................................................................................................... ..........................................1 applications................................................................................................................... ......................................1 general description ............................................................................................................ ..............................1 1. pin configuration and descriptions.......................... ................................................................ ..............3 2. electrical characteristics .................................................................................................. ..........................5 2.1 dc electrical characteristics ...... ....................................................................................... ...........6 2.2 ac electrical characterist ics ............................................................................................. ...........7 3. detailed description........................................................................................................ .............................8 3.1 typical electrical application schematic ................ .................................................................8 3.2 vco supply recommendations ................................................................................................ ..9 3.3 control interface ......................................................................................................... ......................9 3.3.1 GN2014A laser driver power down .......................................................................... 11 3.4 GN2014A data output driver swing control .......... ............................................................ 11 3.5 GN2014A cross point adjust ................................................................................................ ..... 13 4. packaging and ordering information.......................................................................................... ........ 15 4.1 package dimensions ........................................................................................................ ............. 15 4.2 ordering information ...................................................................................................... ............. 17 revision history ............................................................................................................... ............................... 17
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 3 of 18 proprietary & confidential 1. pin configuration and descriptions figure 1-1: GN2014A pin configuration table 1-1: pin descriptions pin# pin symbol description 1polinv sdo output polarity in version control input 2 rten retimer enable control input 3 eqvcc equalizer power supply 4 eqvee equalizer ground 5 eqinp serial data input (positive) 6 eqinn serial data input (negative) 7 pdvcc cdr power supply 8 pdvee cdr ground 9 swngsel serial data output amplitude select control input 10 cpapol cross point adjust polarity 11 lddisable laser driver power down g n2014a 1 24 23 22 21 20 19 18 17 1 6 15 14 13 12 11 10 9 8 7 6 5 4 3 2 polinv s dov cc s dovee s don s dop lb s don lb s dop eqinn eqinp eqvee eqv cc rten lben v c ovee lol v c ov cc lf lbw c trl pdv cc pdvee lddisa b le c pa s wn gs el c papol
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 4 of 18 proprietary & confidential 12 cpa cross point adjust 13 sdovcc sdo output buffer power supply 14 sdovee sdo output buffer ground 15 sdon serial data output (negative) 16 sdop serial data output (positive) 17 lbsdon loop back serial data output (negative) 18 lbsdop loop back serial data output (positive) 19 lbwctrl pll loop bandwidth control input 20 lf pll loop filter capacitor 21 vcovcc vco power supply 22 vcovee vco ground 23 lol loss of lock monitor output 24 lben loop back enable control input table 1-1: pin descriptions (continued) pin# pin symbol description
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 5 of 18 proprietary & confidential 2. electrical characteristics table 2-1: absolute maximum ratings parameter value supply voltage, v cc -0.3v to 3.6v input voltage range -0.3 to v cc +0.3 esd protection (including high-speed i/os) 2kv (hbm) operating temperature range, t c -40c to 95c reflow profile (tmax) 255c + 5c (3 sec) storage temperature -40c to 100c note: stress above those listed under absolu te maximum ratings may cause permanent damage to the device. this is a stress rating on ly and functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not applied. exposure to ab solute maximum rating conditions for extended periods may affect device reliability.
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 6 of 18 proprietary & confidential 2.1 dc electrical characteristics table 2-2: dc electrical characteristics v cc = +2.8v to +3.47v, t c = -40c to 95c. typical values are at v cc = +3.3v and t a = 25c, unless otherwise specified. note: mvppd refers to mv peak-to-peak differential value. parameter symbol min ty p max units note supply voltage v cc -15% 3.3 +5% v C power consumption C C 300 485 mw C cml input specifications input amplitude v in 120 C 1000 mvppd note 1, note 2 input termination C 80 100 120 differential cml sdo output specifications output amplitude C 300 (3ma mod current) C 1500 (15ma mod current) mvppd controlled using voltage to swingsel, lddisable = low output termination C 80 100 120 differential output with lddisable = high C C C 100 appd C swing select input current C 0 C 150 a required for 0 C 1400mvppd output range cpa input current C C C 250 a required for up to 25% change cml lbsdo output specifications output amplitude v 0lb 160 195 300 mvppd ac coupled with the lbsdi from gn2003s output termination C 80 100 120 differential output buffer switching current i olb C3.9 CmaC control logic input specifications input low voltage v il 0C0.8vC input high voltage v ih 2.0 C v cc vC input low current i il C-100 C av il = 0v input high current i ih C 100 C a v ih = +3.3v, v cc = 3.3v notes: 1. xfp msa revision 4.0 (table 17). 2. if input signal is below 100m v threshold, lol may trigger.
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 7 of 18 proprietary & confidential 2.2 ac electrical characteristics table 2-3: ac electrical characteristics v cc = +2.8v to +3.47v, t c = -40c to 95c. typical values are at v cc = +3.3v and t a = 25c, unless otherwise specified. note: mvppd refers to mv peak-to-peak differential value. parameter symbol min ty p max units note input data rate C 9.95 C 11.3 gb/s nrz input sinusoidal jitter tolerance C 2.4 12.7 C uipp f = 120khz, note 1 C 0.07 0.6 C uipp f = 4mhz C 0.07 0.45 C uipp f = 80mhz equalization gain C 6 C C db note 2 jitter transfer bandwidth setting range C1C8mhz prbs 2 31 -1 data (note 3) jitter peaking C C C 0.03 db all frequencies (with 8mhz lbw) total output jitter C C 0.1 0.15 uipp C sdo output rise/fall time tr, tf C C 30 ps 20% - 80% lock time C C 10 20 ms C notes: 1. at jitter frequencies <120khz the GN2014A jitter tolerance performa nce exceeds the xfi module tr ansmitter input telecom sinus oidal jitter tolerance specifications (xfp msa revision 4.0, figure 16). 2. at 5.35ghz (dielectric loss) 3. 8mhz bandwidth can be obtained using the loop filter components r1, r2. the values for these components should be selected at module level.
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 8 of 18 proprietary & confidential 3. detailed description 3.1 typical electrical application schematic figure 3-1: GN2014A typical electrical application schematic the application schematic for the gn2 014a is highly rela ted to the gn2004s. v cc v cc retimer ena b le polarity inversion eqinn 100n c 9 c6 100n c 7 c 2 100n c 1 100n 100n c 10 10n eqinp u1 g n2014a polinv 1 rten 2 eqv cc 3 eqvee 4 eqinp 5 eqinn 6 pdv cc 7 pdvee 8 9 lddisa b le c pa lol loss of lo c k 10 11 c ross point a d just polarity from/to c ontroller s win gs el output s win g s ele c t c papol lben 12 24 23 v c ovee 22 v c ov cc 21 lf 20 lbw c trl 19 lb s dop 18 lb s don lb s dop lb s don 17 s dop 1 6 s don 15 s dovee 14 s dov cc 13 10n c 8 10n c 5 from/to c ontroller loop b a c k ena b le open r1 (note 3) notes: 1. all passive c omponents are surfa c e mount c omponents with the 0402 footprint size. 2. a c c ouplin g b etween loop ba c k i/os is re c ommen d e d for new d esi g ns. 3. value of this c omponent shoul d b e optomize d a cc or d in g to d esi g n re q uirements. 4. laser driver disa b le may b e c onne c te d d ire c tly to g roun d . 5. this resistor shoul d b e populate d only if any of the followin g c on d itions apply: w this parti c ular input is c ontrolle d b y a separate supply sour c e w this parti c ular input is c ontrolle d b y the d evi c e powere d usin g a separate sour c e an d its output is c apa b le of sour c in g c urrent >40ma to g n2003 s (note 2) v cc c 12 4.7 220n r4 10k laser driver disa b le (note 4) c ross point a d just c 13 100n r3 11k c 12 100n da c v cc c 11 r5 (note 1) 3.9 r2 (note 3) 6 8.1k s dop s don r (note 5) 1k r (note 5) 1k r (note 5) 1k r (note 5) 1k r (note 5) 1k
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 9 of 18 proprietary & confidential 3.2 vco supply recommendations when the host board power supply output is used to power the GN2014A device, additional filtering for the vcovcc supply input is recommended. this filtering is required to improve power line noise rejection. typically, a 1st order rc filter provides sufficient supply noise attenuation (i.e. r5, c1 and c12 in figure 3-1 ). the capacitor c1 = 100nf the capacitor c12 = 4.7 f the maximum value of the resistor r5 can be calculated using the following information: ? minimum operational voltage (after regulation and including supply noise) at the vcovcc supply input (pin 21): vcovcc (min) = 2.74vdc ? maximum operational current into the vcovcc supply input: i vcovcc (max) = 14.9ma 3.3 control interface the GN2014A control interface co nsists of five inputs that determine the mo de in which the device is operating: ? polarity inversion (polinv ) ? loop back enable (lben) ? retimer enable (rten) ? cross point adjust polarity (cpapol) table 3-1 describes the conditions at these inputs to enable or disable a particular mode. figure 3-2 shows a simplified equivalent circuit common for all control inputs. example 3-1: calcula ting resistor values vcc = 2.8vdc. r5 (max) = (vcc - vcovcc (min) ) / i vcovcc (max) = 60mv / 14.9ma = 4 the closest lower standard resistor valu e, which can be used for r5 is 3.9 . when an external ldo voltage regulator is used to power the GN2014A device, r5 =
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 10 of 18 proprietary & confidential figure 3-2: GN2014A control input equivalent circuits when left unconnected, the polinv , lben and rten input level defaults to logic high and the cpapol input defaults to logic low (see figure 7-1). note: since the GN2014A device is specified to operate at vcc values down to 2.8v, special care must be taken when driving control inputs from a controller that uses separate supply line. under no condition should the controller's v oh exceed GN2014A's vcc + 0.3v. table 3-1: operational modes pin# pin symbol description 1polinv serial data output polarity inversion control input 0 inverted polarity (sdop/lbsdop = eqinn and sdon/lbsdon = eqinp) 1 normal polarity (sdop/lbsdop = eqinp and sdon/lbsdon = eqinn) 2 rten retimer enable control input 0 cdr bypassed 1 cdr in path 10 cpapol cross point adjust polarity control input 0 negative cross point adjust 1 positive cross point adjust 24 lben loop back enable control input 0 loop back disabled (data available only on sdop/sdon) 1 loop back enabled (data available on sdop/sdon and lbsdop/lbsdon) 1.5k cpapol vcc vref polinv or 1.5k lben or rten v cc vref iref
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 11 of 18 proprietary & confidential 3.3.1 GN2014A laser driver power down lddisable is a digital control pin which is used to shut down laser modulation when set to high (default level). when set to low, the driver operates normally. 3.4 GN2014A data output driver swing control the GN2014A data output amplitude is controlled using the swngsel control pin. the swngsel control application circuit is shown in figure 3-3 . output voltage from a dac, applied to the swngsel control input via external resistor r 3 , is used to control the data output amplitude of the gn2014. table 3-3 shows expected GN2014A data outp ut amplitude for a given swngsel voltage. note: the dac should be able to source up to150 a of current. table 3-2: control logic input specifications pin # pin symbol description 11 lddisable laser driver power down 1 laser driver power down (default) 0 laser driver enabled
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 12 of 18 proprietary & confidential figure 3-3: GN2014A swngsel control application circuit table 3-3: GN2014A output amplitude vs. swing select voltage swing select voltage at dac (assumes 11k resistor in series) GN2014A output (typical, lddisable low) comments 0-0.8 soft turn on 1.2v 150mvpp single ended 3ma modulation current 1.8v 350mvpp single ended 7ma modulation current 2.3v 500mvpp single ended 10ma modulation current 2.8v (recommended max) 750m vpp single ended 15ma modulation current 3.3v (reliability max) not recommended 18ma modulation max current GN2014A 10k q1 q2 1k 1k 9 swngsel digital to analog converter r 3 11k 0v to 3.0v to current mirror c 12 100nf see table 3-3 for more details
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 13 of 18 proprietary & confidential 3.5 GN2014A cross point adjust the GN2014A cross point adjust is used to pre-distort the output signal to optimize optical performance. this is accomplished using two control pins: 1. cpapol (pin 10) ? controls directio n of crosspoint change, digital pin 2. cpa (pin 12) ? controls magnitude of crosspoint change, analog control with cpa voltage set to nominal 0.8v, the output waveform will have a cross point at the 50% level, as indicated in figure 3-4 . figure 3-4: GN2014A output signal with cpa voltage set to 0.8v to increase the cross point to the 75% level, the cpa polarity (pin 10:cpapol) must be set high, and the cpa voltage (pin 12:cpa) increased to 3.1v. this results in the output waveform illustrated in figure 3-5 . figure 3-5: GN2014A output signal when cpa polarity control input is set high, cpa = 3.1v the cross point can be set to an intermediate level between 50% and 75% by setting the cpa to a voltage between 0.8v and 3.1v. 75 % 50 % 25 % 0ps 6 0ps 120ps 180ps time (s) c rossin g point is at 50 % level c rosspoint 75 % 50 % 25 % 0ps 6 0ps 120ps 180ps time(s)
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 14 of 18 proprietary & confidential to decrease the cross point to the 25% level, the cpa polarity (pin 10:cpapol) must be set low, and the cpa voltage (pin 12:cpa) incr eased to 3.1v. this results in the output waveform illustrated in figure 3-6 . figure 3-6: GN2014A output signal when cpa polarity control input is set low, cpa = 3.1v the cross point can be set to an intermediate level between 50% and 25% by setting the cpa to a voltage between 0.8v and 3.1v. note: when the cpa control function is not used, connect cpa (pin 12: cpa) to v cc using a 200k resistor. the cpapol pin (pin 10: cpapol) may be left open. c rosspoint 75 % 50 % 25 % 0ps 6 0ps 120ps 180ps time(s)
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 15 of 18 proprietary & confidential 4. packaging and ordering information 4.1 package dimensions figure 4-1 shows the GN2014A footprint. figure 4-1: GN2014A footprint 0.25 3.8 0.5 3.8 pin1 2.1 2.1 0.3 0.6 0.5 0.25 4.0 4.0 package ou tline pad de tails 0.3 0.6 c.l. of pa ckage c.l. of package metal area for p addle ground notes: 1. controlling dimensions in mm. 2. dimension tolerances are 0.1 unless otherwise specified.
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 16 of 18 proprietary & confidential figure 4-2: package information
GN2014A xfp tx signal conditioner with vcsel driver data sheet 39260 - 8 may 2010 17 of 18 proprietary & confidential figure 4-3: package marking 4.2 ordering information revision history GN2014A package mark xxxx last 4 digits of work order yyww date code e3 pb-free indicator GN2014A xxxxe3 yyww gennum pin 1 indicator part number package case temperature GN2014Acne3 24-pin qfn -40c to +95c version ecr date changes and / or modifications 3 144211 february 2007 updated table 8.1 4 144650 march 2007 missing information on cpapol 5 145750 june 2007 update esd info, remove reference to swing select control input in section 7 6 148393 november 2007 close car #5632 7 152775 october 2009 changed figure 4-2: package information . 8 154165 may 2010 converted document back to data sheet.
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