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general description the max9247 digital video parallel-to-serial converterserializes 27 bits of parallel data into a serial-data stream. eighteen bits of video data and 9 bits of control data are encoded and multiplexed onto the serial interface, reduc- ing the serial-data rate. the data-enable input determines when the video or control data is serialized. the max9247 pairs with the max9248/max9250 dese- rializers to form a complete digital video serial link. interconnect can be controlled-impedance pcb traces or twisted-pair cable. proprietary data encoding reduces emi and provides dc balance. dc balance allows ac- coupling, providing isolation between the transmitting and receiving ends of the interface. the lvds output is internally terminated with 100 ? . for operating frequen- cies less than 35mhz, the max9247 can also pair withthe max9218 deserializer. esd tolerance is specified for iso 10605 with ?0kv contact discharge and ?0kv air-gap discharge. the max9247 operates from a +3.3v core supply and features a separate input supply for interfacing to 1.8v to 3.3v logic levels. this device is available in a 48-lead lqfp package and is specified from -40? to +85? or -40? to +105?. applications navigation system displaysin-vehicle entertainment systems video cameras lcds features ? preemphasis improves eye diagram and signalintegrity at the output ? proprietary data encoding for dc balance andreduced emi ? control data sent during video blanking ? five control data inputs are single-bit-errortolerant ? programmable phase-shifted lvds signalingreduces emi ? output common-mode filter reduces emi ? greater than 10m stp cable drive ? wide ?% reference clock tolerance ? iso 10605 and iec 61000-4-2 level 4esd protection ? separate input supply allows interface to 1.8vto 3.3v logic ? +3.3v core supply ? space-saving lqfp package ? -40? to +85? and -40? to +105? operatingtemperature ranges max9247 ________________________________________________________________ maxim integrated products 1 rng0rng1 v cclvds out+out- lvdsgnd lvdsgnd cmf pwrdwn v ccpll pllgndpre gnd v ccin rgb_in10rgb_in11 rgb_in12 rgb_in13 rgb_in14 rgb_in15 rgb_in16 rgb_in17 cntl_in0 cntl_in1 12 3 4 5 6 7 8 9 1011 12 3635 34 33 32 31 30 29 28 27 26 25 gnd v cc cntl_in2 cntl_in3cntl_in4 cntl_in5 cntl_in6 cntl_in7 cntl_in8 de_in pclk_in i.c. lqfp + max9247 1314 15 16 17 18 19 20 21 22 23 24 4847 46 45 44 43 42 41 40 39 38 37 rgb_in9rgb_in8 rgb_in7 rgb_in6 rgb_in5 rgb_in4 rgb_in3 rgb_in2 rgb_in1 rgb_in0 v cc gnd top view part temp range pin-package max9247ecm+ -40 c to +85 c 48 lqfp max9247ecm/v+ -40 c to +85 c 48 lqfp max9247gcm+ -40 c to +105 c 48 lqfp max9247gcm/v+ -40 c to +105 c 48 lqfp pin configuration ordering information 19-3955; rev 4; 4/12 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. evaluation kit available + denotes a lead(pb)-free/rohs-compliant package. /v denotes an automotive qualified part. 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics(v cc_ = +3.0v to +3.6v, r l = 100 ? ?%, pwrdwn = high, pre = low, t a = -40? to +105?, unless otherwise noted. typical values are at v cc_ = +3.3v, t a = +25?.) (notes 1, 2) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v cc_ to _gnd........................................................-0.5v to +4.0v any ground to any ground...................................-0.5v to +0.5v out+, out-, cmf to lvdsgnd...........................-0.5v to +4.0v out+, out- short circuit to lvdsgnd or v cclvds .............................................................continuous out+, out- short through 0.125? (or smaller), 25v series capacitor..........................................-0.5v to +16v rgb_in[17:0], cntl_in[8:0], de_in, rng0, rng1, pre, pclk_in, pwrdwn to gnd ...............................-0.5v to (v ccin + 0.5v) continuous power dissipation (t a = +70?) 48-lead lqfp (derate 20.8mw/? above +70?)....1666.7mw esd protection machine model (r d = 0 ? , c s = 200pf) all pins to gnd ..............................................................?00v human body model (r d = 1.5k ? , c s = 100pf) all pins to gnd ................................................................?kv iso 10605 (r d = 2k ? , c s = 330pf) contact discharge (out+, out-) to lvdsgnd ...........?0kv air-gap discharge (out+, out-) to lvdsgnd ...........?0kv iec 61000-4-2 (r d = 330 ? , c s = 150pf) contact discharge (out+, out-) to lvdsgnd ...........?0kv air-gap discharge (out+, out-) to lvdsgnd ...........?5kv storage temperature range .............................-65? to +150? junction temperature ......................................................+150? lead temperature (soldering, 10s)..................................+300? soldering temperature (reflow) .......................................+260? parameter symbol conditions min typ max units single-ended inputs (rgb_in[17:0], cntl_in[8:0], de_in, pclk_in, pwrdwn , rng_, pre) v ccin = 1.71v to < 3v (note 3) 0.65 x v ccin v ccin + 0.3 high-level input voltage v ih v ccin = 3.0v to 3.6v 2 0.3 + v ccin v v ccin = 1.71v to < 3v (note 3) -0.3 0.3 x v ccin low-level input voltage v il v ccin = 3.0v to 3.6v -0.3 +0.8 v v in = -0.3v to 0v (max9247ecm),v in = -0.15v to 0v (max9247gcm) -100 +20 input current i in v ccin = 1.71v to 3.6v,pwrdwn = high or low v in = 0v to ( v c c in + 0.3v) -20 +20 ? input clamp voltage v cl i cl = -18ma -1.5 v lvds outputs (out+, out-) differential output voltage v od figure 1 250 335 450 mv change in v od between complementary output states ? v od figure 1 20 mv common-mode voltage v os figure 1 1.125 1.29 1.475 v change in v os between complementary output states ? v os figure 1 20 mv output short-circuit current i os v out+ or v out- = 0v or 3.6v -15 ? +15 ma magnitude of differentialoutput short-circuit current i osd v od = 0v 5.5 15 ma v out+ = 0v, v out- = 3.6v output high-impedancecurrent i oz pwrdwn = low or v cc_ = 0v v ou t + = 3.6v , v out- = 0v -1 +1 ? downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer _______________________________________________________________________________________ 3 ac electrical characteristics(v cc_ = +3.0v to +3.6v, r l = 100 ? ?%, c l = 5pf, pwrdwn = high, pre = low, t a = -40? to +105?, unless otherwise noted. typical values are at v cc_ = +3.3v, t a = +25?.) (note 3) parameter symbol conditions min typ max units pclk_in timing requirements max9247ecm 23.8 400.0 clock period t t figure 2 max9247gcm 28.6 400.0 ns max9247ecm 2.5 42.0 clock frequency f clk max9247gcm 2.5 35.0 mhz clock frequency difference fromdeserializer reference clock ? f clk -2 +2 % clock duty cycle dc t high /t t or t low /t t , figure 2 35 50 65 % clock transition time t r , t f figure 2 2.5 ns switching characteristics pre = low 280 370 output rise time t rise 20% to 80%,v od 250mv, figure 3 pre = high 240 320 ps pre = low 280 370 output fall time t fall 80% to 20%,v od 250mv, figure 3 pre = high 240 320 ps input setup time t set figure 4 3 ns input hold time t hold figure 4 3 ns dc electrical characteristics (continued)(v cc_ = +3.0v to +3.6v, r l = 100 ? ?%, pwrdwn = high, pre = low, t a = -40? to +105?, unless otherwise noted. typical values are at v cc_ = +3.3v, t a = +25?.) (notes 1, 2) parameter symbol conditions min typ max units differential output resistance r o 78 110 147 pre = 0 15 25 2.5mhz pre = 1 27 pre = 0 18 25 5mhz pre = 1 27 pre = 0 23 28 10mhz pre = 1 30 pre = 0 33 39 20mhz pre = 1 42 pre = 0 50 65 35mhz pre = 1 69 pre = 0 60 70 worst-case supply current i ccw r l = 100 1%, c l = 5pf, continuous 10transition words 42mhz pre = 1 75 ma power-down supply current i ccz (note 4) 50 ? downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer 4 _______________________________________________________________________________________ ac electrical characteristics (continued)(v cc_ = +3.0v to +3.6v, r l = 100 ? ?%, c l = 5pf, pwrdwn = high, pre = low, t a = -40? to +105?, unless otherwise noted. typical values are at v cc_ = +3.3v, t a = +25?.) (note 3) parameter symbol conditions min typ max units serializer delay t sd figure 5 3.10 x t t + 2.0 3.10 x t t + 8.0 ns pll lock time t lock figure 6 17,100 x t t ns power-down delay t pd figure 7 1 ? peak-to-peak output jitter t jitt measured with prbs input pattern at840mbps data rate 150 ps 840mbps data rate,cmf open, figure 8 22 70 peak-to-peak output offsetvoltage v os ( p-p ) 840mbps data rate,cmf 0.1? to ground, figure 8 12 50 mv note 1: current into a pin is defined as positive. current out of a pin is defined as negative. all voltages are referenced to ground, except v od , ? v od , and ? v os . note 2: maximum and minimum limits over temperature are guaranteed by design and characterization. devices are productiontested at t a = +25?. note 3: parameters are guaranteed by design and characterization and are not production tested. limits are set at ? sigma. note 4: all lvttl/lvcmos inputs, except pwrdwn at 0.3v or v ccin - 0.3v. pwrdwn is 0.3v. downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer _______________________________________________________________________________________ 5 worst-case pattern supply current vs. frequency max9247 toc01 frequency (mhz) supply current (ma) 40 30 20 10 10 20 30 40 50 60 70 0 0 with preemphasis without preemphasis eye diagram with preemphasis max9247 toc03 100mv/div 200ps/div f refclk = 42mhz 2 meter cat5 cable gnd 100 termination pre = high eye diagram without preemphasis max9247 toc02 100mv/div 200ps/div f refclk = 42mhz 2 meter cat5 cable gnd 100 termination pre = low bit-error rate vs. cable length max9247 toc04 cat5 cable length (m) bit-error rate 81012 6 4 2 1.00e-11 1.00e-12 1.00e-13 1.00e-141.00e-10 0 cat5 cable f refclk = 42mhz 840mbps data ratefor cable length < 10m ber < 10 -12 cable length vs. frequency bit-error rate < 10 -9 max9247 toc05 cable length (m) frequency (mhz) 15 25 35 45 5 20 30 4010 18 16 14 12 10 8642 02 0 typical operating characteristics (v cc_ = +3.3v, r l = 100 ? , t a = +25?, unless otherwise noted.) downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer 6 _______________________________________________________________________________________ pin description pin name function 1, 13, 37 gnd input buffer supply and digital supply ground 2v ccin input buffer supply voltage. bypass to gnd with 0.1? and 0.001? capacitors in parallel asclose to the device as possible, with the smallest value capacitor closest to the supply pin. 3?0, 39?8 rgb_in10 rgb_in17, rgb_in0 rgb_in9 lvttl/lvcmos red, green, and blue digital video data inputs. eighteen data bits are loadedinto the input latch on the rising edge of pclk_in when de_in is high. internally pulled down to gnd. 11, 12, 15?1 cntl_in0,cntl_in1, cntl_in2 cntl_in8 lvttl/lvcmos control data inputs. control data are latched on the rising edge of pclk_inwhen de_in is low. internally pulled down to gnd. 14, 38 v cc digital supply voltage. bypass to gnd with 0.1? and 0.001? capacitors in parallel as close tothe device as possible, with the smallest value capacitor closest to the supply pin. 22 de_in lvttl/lvcmos data-enable input. logic-high selects rgb_in[17:0] to be latched. logic-lowselects cntl_in[8:0] to be latched. de_in must be switching for proper operation. internally pulled down to gnd. 23 pclk_in lvttl/lvcmos parallel clock input. latches data and control inputs and provides the pllreference clock. internally pulled down to gnd. 24 i.c. internally connected. leave unconnected for normal operation. 25 pre preemphasis enable input. drive pre high to enable preemphasis. 26 pllgnd pll supply ground 27 v ccpll pll supply voltage. bypass to pllgnd with 0.1? and 0.001? capacitors in parallel as close tothe device as possible, with the smallest value capacitor closest to the supply pin. 28 pwrdwn lvttl/lvcmos power-down input. internally pulled down to gnd. 29 cmf common-mode filter. optionally connect a capacitor between cmf and lvdsgnd to filtercommon-mode switching noise. 30, 31 lvdsgnd lvds supply ground 32 out- inverting lvds serial-data output 33 out+ noninverting lvds serial-data output 34 v cclvds lvds supply voltage. bypass to lvdsgnd with 0.1? and 0.001? capacitors in parallel asclose to the device as possible, with the smallest value capacitor closest to the supply pin. 35 rng1 lvttl/lvcmos frequency range select input. set to the frequency range that includes thepclk_in frequency as shown in table 3. internally pulled down to gnd. 36 rng0 lvttl/lvcmos frequency range select input. set to the frequency range that includes thepclk_in frequency as shown in table 3. internally pulled down to gnd. downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer _______________________________________________________________________________________ 7 functional diagram max9247 timing and control dc balance/ encode input latch rgb_in cntl_in de_in pclk_in rng0 rng1 pwrdwn 1 0 out+ out- pll par-to-ser cmf pre out- v od v os gnd r l /2 r l /2 out+ out- out+ (out+) - (out-) v os (-) v os (+) ((out+) + (out-))/2 v os (-) v od (-) v od (-) v od = 0v ? v os = | v os (+) - v os (-) | ? v od = | v od (+) - v od (-) | v od (+) figure 1. lvds dc output load and parameters downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer 8 _______________________________________________________________________________________ v ilmax t high t low t t t r t f v ihmin pclk_in figure 2. parallel clock requirements out- c l c l r l out+ t fall 20% 20% (out+) - (out-) 80% 80% t rise figure 3. output rise and fall times v ihmin v ihmin v ihmin v ilmax v ilmax v ilmax pclk_in rgb_in[17:0] cntl_in[8:0] de_in t hold t set figure 4. synchronous input timing downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer _______________________________________________________________________________________ 9 t sd bit 0 bit 19 n n + 3 expanded time scale n + 4 n n + 1 n + 2 n - 1 rgb_in cntl_in pclk_in out_ figure 5. serializer delay v od = 0v high impedance v ilmax t lock pwrdwn (out+) - (out-) pclk_in figure 6. pll lock time high impedance v ilmax t pd pwrdwn (out+) - (out-) pclk_in figure 7. power-down delay downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer 10 ______________________________________________________________________________________ detailed description the max9247 dc-balanced serializer operates at a2.5mhz-to-42mhz parallel clock frequency, serializing 18 bits of parallel video data rgb_in[17:0] when the data-enable input de_in is high, or 9 bits of parallel control data cntl_in[8:0] when de_in is low. the rgb video input data are encoded using 2 overhead bits, en0 and en1, resulting in a serial word length of 20 bits (see table 1). control inputs are mapped to 19 bits and encoded with 1 overhead bit, en0, also result- ing in a 20-bit serial word. encoding reduces emi and maintains dc balance across the serial cable. twotransition words, which contain a unique bit sequence, are inserted at the transition boundaries of video-to- control and control-to-video phases. control data inputs c0 to c4 are mapped to 3 bits each in the serial control word (see table 2). at the deserial- izer, 2 or 3 bits at the same state determine the state of the recovered bit, providing single-bit-error tolerance for c0 to c4. control data that may be visible if an error occurs, such as vsync and hsync, can be connect- ed to these inputs. control data inputs c5 to c8 are mapped to 1 bit each. out- out+ ((out+) + (out-))/2 v os(p-p) v os(p-p) 01234567891 01 11 21 31 41 51 61 71 81 9 en0 en1 s0 s1 s2 s3 s4 s5 s6 s7 s8 s9 s10 s11 s12 s13 s14 s15 s16 s17 figure 8. peak-to-peak output offset voltage bit 0 is the lsb and is serialized first. en[1:0] are encoding bits. s[17:0] are encoded symbols. table 1. serial video phase word format 01234567891 01 11 21 31 41 51 61 71 81 9 e n 0c0c0c0c1c1c1c2c2c2c3c3c3c4c4c4c5c6c7c8 bit 0 is the lsb and is serialized first. c[8:0] are the control inputs. table 2. serial control phase word format downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer ______________________________________________________________________________________ 11 transition timing the transition words require interconnect bandwidthand displace control data. therefore, control data is not sampled (see figure 9): two clock cycles before de_in goes high during the video phase two clock cycles after de_in goes low the last sampled control data are latched at the deserial- izer control data outputs during the transition and video phases. video data are latched at the deserializer rgb data outputs during the transition and control phases. applications information ac-coupling benefits ac-coupling increases the common-mode voltage tothe voltage rating of the capacitor. two capacitors are sufficient for isolation, but four capacitors?wo at the serializer output and two at the deserializer input?ro- vide protection if either end of the cable is shorted to a high voltage. ac-coupling blocks low-frequency ground shifts and common-mode noise. the max9247 serializer can also be dc-coupled to the max9248/ max9250 deserializers. figures 10 and 12 show an ac-coupled serializer and deserializer with two capacitors per link. figures 11 and 13 show the ac-coupled serializer and deserializer withfour capacitors per link. selection of ac-coupling capacitors see figure 14 for calculating the capacitor values forac-coupling depending on the parallel clock frequen- cy. the plot shows capacitor values for two- and four- capacitor-per-link systems. for applications using less than 18mhz clock frequency, use 0.1? capacitors. frequency-range setting rng[1:0] the rng[1:0] inputs select the operating frequencyrange of the max9247 serializer. an external clock with- in this range is required for operation. table 3 shows the selectable frequency ranges and corresponding data rates for the max9247. rng1 rng0 parallel clock (mhz) serial-data rate (mbps) 0 0 2.5 to 5 50 to 100 0 1 5 to10 100 to 200 1 0 10 to 20 200 to 400 1 1 20 to 42 400 to 840 table 3. parallel clock frequency rangeselect figure 9. transition timing pclk_in cntl_in de_in rgb_in = not sampled by pclk_in control phase control phase transition phase transition phase video phase downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer 12 ______________________________________________________________________________________ max9247 par-to-ser timing and control dc balance/ encode input latch rgb_in cntl_in de_in pclk_in rng0 rng1 pwrdwn 1 0 130 v cc 130 in out 82 82 cmf pre rng1 rng0 max9250 ser-to-par timing and control pll dc balance/ decode 1 0 outenrgb_out lock pwrdwn ref_in pclk_out de_out cntl_out r/f ceramic rf surface-mount capacitor 100 differential stp cable pll * * *capacitors can be at either end. figure 10. ac-coupled max9247 serializer and max9250 deserializer with two capacitors per link max9247 par-to-ser timing and control dc balance/ encode input latch rgb_in cntl_in de_in pclk_in rng0 rng1 pwrdwn 1 0 130 v cc 130 in out 82 82 rng1 rng0 max9250 ser-to-par timing and control pll dc balance/ decode 1 0 outenrgb_out lock pwrdwn ref_in pclk_out de_out cntl_out ceramic rf surface-mount capacitor 100 differential stp cable pll cmf pre r/f figure 11. ac-coupled max9247 serializer and max9250 deserializer with four capacitors per link downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer ______________________________________________________________________________________ 13 max9247 par-to-ser timing and control dc balance/ encode input latch rgb_in cntl_in de_in pclk_in rng0 rng1 pwrdwn 1 0 130 v cc 130 in+in- out 82 82 cmf pre refclk max9248 ser-to-par timing and control pll dc balance/ decode 1 0 rgb_out lock pwrdwn ss pclk_out de_out cntl_out ceramic rf surface-mount capacitor 100 differential stp cable pll * * *capacitors can be at either end. sspll fifo rng[0:1] r/f figure 12. ac-coupled max9247 serializer and max9248 deserializer with two capacitors per link max9247 par-to-ser timing and control dc balance/ encode input latch rgb_in cntl_in de_in pclk_in rng0 rng1 pwrdwn 1 0 130 v cc 130 in+in- out 82 82 cmf pre refclk max9248 ser-to-par timing and control pll dc balance/ decode 1 0 rgb_out lock pwrdwn ss pclk_out de_out cntl_out ceramic rf surface-mount capacitor 100 differential stp cable pll sspll fifo rng[0:1] r/f figure 13. ac-coupled max9247 serializer and max9248 deserializer with four capacitors per link downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer 14 ______________________________________________________________________________________ termination the max9247 has an integrated 100 ? output-termina- tion resistor. this resistor damps reflections frominduced noise and mismatches between the transmis- sion line impedance and termination resistors at the deserializer input. with pwrdwn = low or with the sup- ply off, the output termination is switched out and thelvds output is high impedance. common-mode filter the integrated 100 ? output termination is made up of two 50 ? resistors in series. the junction of the resistors is connected to the cmf pin for connecting an optionalcommon-mode filter capacitor. connect the filter capacitor to ground close to the max9247 as shown in figure 15. the capacitor shunts common-mode switch- ing current to ground to reduce emi. lvds output preemphasis (pre) the max9247 features a preemphasis mode where extracurrent is added to the output and causes the ampli- tude to increase by 40% to 50% at the transition point. preemphasis helps to get a faster transition, better eye diagram, and improve signal integrity. see the typical operating characteristics . the additional current is turned on for a short time (360ps, typ) during data transi-tion, and then turned off. enable preemphasis by driving pre high. power-down and power-off driving pwrdwn low stops the pll, switches out the integrated 100 ? output termination, and puts the output in high impedance to ground and differential. with pwrd- wn 0.3v and all lvttl/lvcmos inputs 0.3v or v ccin - 0.3v, supply current is reduced to 50? or less. driving pwrdwn high starts pll lock to pclk_in and switches in the 100 ? output termination resistor. the lvds output is not driven until the pll locks. the lvdsoutput is high impedance to ground and 100 ? differen- tial. the 100 ? integrated termination pulls out+ and out- together while the pll is locking so that v od = 0v. if v cc = 0, the output resistor is switched out and the lvds outputs are high impedance to ground and differential. pll lock time the pll lock time is set by an internal counter. the locktime is 17,100 pclk_in cycles. power and clock should be stable to meet the lock-time specification. input buffer supply the single-ended inputs (rgb_in[17:0], cntl_in[8:0],de_in, rng0, rng1, pre, pclk_in, and pwrdwn ) are powered from v ccin . v ccin can be connected to a 1.71v to 3.6v supply, allowing logic inputs with a nomi-nal swing of v ccin . if no power is applied to v ccin when power is applied to v cc , the inputs are disabled and pwrdwn is internally driven low, putting the device in the power-down state. power-supply sequencing of max9247 and max9248/max9250 video link the max9247 and max9248/max9250 video link canbe powered up in several ways. the best approach is to keep both max9247 and max9248 powered down while supplies are ramping up and pclk_in of the max9247 and refclk of the max9248/max9250 are stabilizing. after all of the power supplies of the max9247 and max9248/max9250 are stable, including pclk_in and refclk, do the following: 1) power up the max9247 first ac-coupling capacitor value vs. parallel clock frequency parallel clock frequency (mhz) capacitor value (nf) 21 24 27 33 36 39 30 120 8060 40 20 100 140 0 18 42 four capacitors per link two capacitors per link figure 14. ac-coupling capacitor values vs. clock frequency of 18mhz to 42mhz out+ r o /2 r o /2 cmf out- c cmf figure 15. common-mode filter capacitor connection downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer ______________________________________________________________________________________ 15 2) wait for at least t lock of max9247 (or 17100 x t t ) to get activity on the link 3) power up the max9248 power-supply circuits and bypassing the max9247 has isolated on-chip power domains. thedigital core supply (v cc ) and single-ended input supply (v ccin ) are isolated but have a common ground (gnd). the pll has separate power and ground (v ccpll and pllgnd) and the lvds input also has separate powerand ground (v cclvds and lvdsgnd). the grounds are isolated by diode connections. bypass each v cc , v ccin , v ccpll , and v cclvds pin with high-frequency, surface- mount ceramic 0.1? and 0.001? capacitors in parallelas close to the device as possible, with the smallest value capacitor closest to the supply pin. lvds output the lvds output is a current source. the voltage swingis proportional to the termination resistance. the output is rated for a differential load of 100 ? ?%. cables and connectors interconnect for lvds typically has a differential imped-ance of 100 ? . use cables and connectors that have matched differential impedance to minimize impedancediscontinuities. twisted-pair and shielded twisted-pair cables offersuperior signal quality compared to ribbon cable and tend to generate less emi due to magnetic field cancel- ing effects. balanced cables pick up noise as common mode, which is rejected by the lvds receiver. board layout separate the lvttl/lvcmos inputs and lvds outputto prevent crosstalk. a four-layer pcb with separate lay- ers for power, ground, and signals is recommended. esd protection the max9247 esd tolerance is rated for iec 61000-4-2, human body model, machine model, and iso 10605 standards. iec 61000-4-2 and iso 10605 specify esd tolerance for electronic systems. the iec 61000-4-2 discharge components are c s = 150pf and r d = 330 ? (figure 16). for iec 61000-4-2, the lvds outputs are rated for ?kv contact discharge and ?5kv air-gap discharge. the human body model discharge components are c s = 100pf and r d = 1.5k ? (figure 17). for the human body model, all pins are rated for?kv contact discharge. the iso 10605 discharge components are c s = 330pf and r d = 2k ? (figure 18). for iso 10605, the lvds outputs are rated for?0kv contact and ?0kv air discharge. the machine model discharge components are c s = 200pf and r d = 0 ? (figure 19). c s 150pf storage capacitor high- voltage dc source device under test charge-current- limit resistor discharge resistance r d 330 figure 16. iec 61000-4-2 contact discharge esd test circuit storage capacitor high- voltage dc source device under test charge-current- limit resistor discharge resistance 1m r d 1.5k c s 100pf figure 17. human body esd test circuit storage capacitor high- voltage dc source device under test charge-current- limit resistor discharge resistance r d 2k c s 330pf figure 18. iso 10605 contact discharge esd test circuit storage capacitor high- voltage dc source device under test charge-current- limit resistor discharge resistance r d 0 c s 200pf figure 19. machine model esd test circuit downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer 16 ______________________________________________________________________________________ chip information process: cmos package information for the latest package outline information and land patterns(footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only.package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package type package code outline no. land pattern no. 48 lqfp c48+5 21-0054 90-0093 downloaded from: http:///
max9247 27-bit, 2.5mhz-to-42mhz dc-balanced lvds serializer maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. 17 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 2 5/08 corrected lqfp package, added +105 c part, changed temperature limits for +105 c rated part, and added machine model esd text and diagram 1?, 15?9 3 4/09 added /v parts in the ordering information table and added new power- supply sequencing of max9247 and max9248/max9250 video link section 1, 14 4 4/12 corrected errors in absolute maximum ratings and pin description sections 2, 6 downloaded from: http:///

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