View MAX3845UCQD_8695754.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

general description the max3845 is a tmds 2-to-4 fanout switch and cable driver for multimonitor distribution of dvi ? or hdmi ? signaling up to 1.65gbps. both inputs and out- puts are standard tmds signaling as per dvi and hdmistandards. because tmds links are ?oint-to-point, buffering is required for fanout applications. four dvi/hdmi tmds outputs are provided for fanout distribution. each tmds output can be independently sourced from either input or can be turned off. each tmds input or output is composed of four differential channels that can be arbitrarily assigned to the three data signals and the 1/10th-rate clock. the data rate depends on resolution, but it can vary from 250mbps (vga) to 1.65gbps (uxga or 1080p/60). typical applications include multiroom display of the same video source or industrial/commercial signage applications such as airport monitors or trading room floor displays. the max3845 includes selectable output preemphasis that extends output cable reach up to an additional 7m. for ddc switching, use the companion max4814e 2:4 low-resistance cmos crosspoint switch. ddc switching is not required for applications that connect ddc to one reference monitor only. the max3845 can be configured to create a 2 x 8 or 4 x 4 switch (see the typical operating circuit diagrams). the max3845 is available in a 14mm 14mm, 100-pin tqfp-ep package and operates over the -10 c to +85 c temperature range. applications digital signage and industrial displaypc monitor distribution home a/v receivers dvi/hdmi distribution amplifiers dvi/hdmi crosspoint switches features ? two dvi/hdmi tmds-compatible inputs and fourdvi/hdmi tmds-compatible outputs ? save power by turning off unused outputs ? each output independently selects input 1 orinput 2 ? three preemphasis settings extend cable reachup to 7m ? operation up to 1.65gbps ? 14mm x 14mm, 100-pin tqfp package withexposed paddle for heat sinking ? 3.3v power supply ? tmds data (x3) and clock (x1) can be arbitrarilyassigned to the four identical switched paths (a, b, c, and d) max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver ________________________________________________________________ maxim integrated products 1 ordering information 19-0798; rev 0; 4/07 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. + denotes a lead-free package. ep = exposed pad. typical operating circuits continued at end of data sheet. tmds is a registered trademark of silicon image, inc. dvi is a trademark of digital display working group. hdmi is a trademark of hdmi licensing, llc. evaluation kit available pin configuration appears at end of data sheet. part temp range pin-package pkg code max3845ucq+ -10 c to +85 c 100 tqfp-ep c100e-3 max3845 2:4 fanout/switch application in_sel[1:4] hotplug[1:4] preemph[1:4] control signals video source 1video source 2 output to display 2 output to display 1output to display 3 output to display 4 2:4 cmos switch x5 buffer 2:4 dvi/hdmi tmds fanout switch and cable driver ddc data, ddc clk,hotplug, 5v, gnd, (cec) typical operating circuit downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics(v cc = 3.0v to +3.6v, t a = -10? to +85?. typical values are at v cc = +3.3v, external terminations = 50 ?%, tmds rate = 250mbps to 1.65gbps, t a = +25?, unless otherwise noted.) (note 1) 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. supply voltage range (v cc ) ................................-0.3v to +5.5v voltage range at hotplugx pins ......................-0.3v to +6.0v voltage range at lvttl, lvcmos, i/o pins .......-0.3v to +5.5v voltage range at cml output pins ......................-0.3v to +5.5v voltage range at cml input pins (cml short to gnd duration < 1s)....................-0.3v to +4.0v voltage between any input cml i/o complementary pair ......................................................?.3v voltage range at losmute_en ..........................-0.3v to +5.5v voltage between any output cml i/o complementary pair.......................................................?.6v continuous power dissipation (t a = +70 c) 100-pin tqfp-ep (derate 45.5mw/ c above +70 c) ............................................................3636mw operating junction temperature .....................-55? to +150? storage temperature range ............................-55? to +150? die attach temperature ..................................................+400? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units power-supply current i cc preemph[1:4] = high, out_level = high, current into v cc pins, 1200mv p-p = v in 454 626 ma supply-noise tolerance dc to 500khz 50 mv p-p skin-effect equalizer peaking fixed rx equalizer compensation gain at 825mhz 1 preemphx pin = low 0 preemphx pin = open 3 settable tx preemphasis preemphx pin = high 6 db jitter performance 0db cable loss, no preemphasis 0.04 0.12 3db cable loss, +3db preemphasis 0.05 0.12 200 back termination 6db cable loss, +6db preemphasis 0.07 0.12 0db cable loss, no preemphasis 0.07 0.2 3db cable loss, +3db preemphasis 0.08 0.2 residual deterministic jitter (measured at end of cable having ideal skin-effect loss and connectors, e.g., gore twin coax, amphenol skewclear twinax, with sma connectors) (note 2) no back termination 6db cable loss, +6db preemphasis 0.10 0.2 ui residual random jitter (note 3) measured with source t r /t f = 250ps 1.5 2 ps rms cml inputs (source side) differential-input voltage swing v id at cable input 400 2000 mv p-p common-mode input voltage v cm v cc - 1000 v cc input voltage when disconnected v cc - 10 v cc + 10 mv downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver _______________________________________________________________________________________ 3 note 1: ac specifications are guaranteed by design and characterization. note 2: test pattern is a 2 10 - 1 prbs + 20 ones + 2 10 - 1 prbs (inverted) + 20 zeros. note 3: test pattern is a 1111 0000 pattern at 1.65gbps. electrical characteristics (continued)(v cc = 3.0v to +3.6v, t a = -10? to +85?. typical values are at v cc = +3.3v, external terminations = 50 ?%, tmds rate = 250mbps to 1.65gbps, t a = +25?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units input resistance r in single-ended 45 50 55 input los/mute threshold differential peak-peak 150 mv deassert mute 1.2 input los/mute response time assert mute 0.6 s input return loss differential, 1.6ghz 19 db cml outputs (cable side) no preemphasis, no back termination, out_level = low 900 1050 1200 differential-output voltage swing v od no preemphasis, 200 back termination, out_level = high 825 925 1050 mv p-p output-voltage high v oh single-ended, no back termination v cc - 10 v cc + 10 output voltage during power- down v off single-ended, pwrdwn_x = low or v cc = 0v v cc - 10 v cc + 10 mv rise/fall time 20% to 80% (t a = 0 c to +85 c) 75 90 140 intrapair skew 12 40 interpair skew worst case among a, b, c, and d of an output 35 60 ps control interface lvttl input high voltage v ih 2.0 all except in_selx pins 1.0 lvttl input low voltage v il in_selx pins 0.8 v lvttl input high current v ih(min) < v in < v ih(max) 100 all except out_level pin 150 lvttl input low current v il(min) < v in < v il(max) out_level pin 500 a hotplugx input high voltage typical input 30k to gnd v cc - 0.2 5.5 hotplugx input low voltage 1.5 v downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver 4 _______________________________________________________________________________________ typical operating characteristics (typical values are at v cc = +3.3v, t a = +25?, data pattern = 2 10 - 1 prbs + 20 ones + 2 10 - 1 prbs (inverted) + 20 zeros, unless otherwise noted.) supply current vs. ambient temperature max3845 toc01 ambient temperature ( c) i cc (ma) 80 65 5 20 35 50 360 380 400 420 440 460 480 500340 -10 out_level = low,all inputs/outputs active, preemphasis same on all output channels 0db preemphasis 3db preemphasis 6db preemphasis supply current vs. ambient temperature max3845 toc02 ambient temperature ( c) i cc (ma) 80 65 5 20 35 50 360 380 400 420 440 460 480 500340 -10 out_level = high,all inputs/outputs active, preemphasis same on all output channels 0db preemphasis 3db preemphasis 6db preemphasis output eye diagram at 1.65gbps short low-loss sma cable max3845 toc03 100ps/div 150mv/div 0db preemphasis200 back termination output eye diagram at 2.25gbps short low-loss sma cable max3845 toc04 80ps/div 150mv/div 0db preemphasis200 back termination output eye diagram at 1.65gbps 6db loss, 24awg, 25ft twin-ax cable max3845 toc05 100ps/div 150mv/div 6db preemphasis200 back termination output eye diagram at 2.25gbps 6db loss, 24awg, 25ft twin-ax cable max3845 toc06 80ps/div 150mv/div 6db preemphasis200 back termination output eye diagram at 1.65gbps through 2m dvi to hdmi cable max3845 toc07 100ps/div 150mv/div 6db preemphasis200 back termination jitter vs. input-side cable loss at 825 mhz max3845 toc08 cable loss (db) jitter (ps p-p ) 6 4 2 20 40 60 80 100 120 140 160 0 08 data rate = 1.65gbps200 back termination jitter vs. output-side cable loss at 825 mhz max3845 toc09 cable loss (db) jitter (ps p-p ) 6 4 2 20 40 60 80 100 120 0 08 0db preemphasis 3db preemphasis 6db preemphasis data rate = 1.65gbps200 back termination downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver _______________________________________________________________________________________ 5 differential-input return loss vs. frequency max3845 toc10 frequency (mhz) gain (db) 2500 2000 500 1000 1500 -35 -30 -25 -20 -15 -10 -5 0 -40 0 3000 temp voltage vs. junction temperature max3845 toc11 junction temperature ( c) temp (v) 130 110 10 30 50 70 90 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.60.8 -10 150 power dissipation vs. ambient temperature max3845 toc12 ambient temperature ( c) power dissipation (mw) 80 65 50 35 20 5 500 1000 1500 2000 2500 3000 0 -10 all inputs/outputs active,preemphasis same on all output channels 0db preemphasisout_level = low 6db preemphasisout_level = high typical operating characteristics (continued) (typical values are at v cc = +3.3v, t a = +25?, data pattern = 2 10 - 1 prbs + 20 ones + 2 10 - 1 prbs (inverted) + 20 zeros, unless otherwise noted.) pin description pin name function 1, 4, 7, 10, 97, 100 v cc1 positive power-supply connection. powers input channel 1 and output channels 1 and 2. 2, 5, 8, 98 in1_b+, in1_c+, in1_d+, in1_a+ noninverting tmds cml input, channel 1 3, 6, 9, 99 in1_b-, in1_c-, in1_d-, in1_a- inverting tmds cml input, channel 1 11 pwrdwn_1 power-down, lvttl/lvcmos input. force high or leave open to power down inpu t channel 1. force low to enable input channel 1. the max3845 powers down if both pwrdwn_1 and pwrdwn_2 are forced high or left open. 12 v cc3 positive power-supply connection. powers the temp-sense circuitry. 13 losmute_en los mute enable input. connect to v cc for typical operation. connect to gnd to disable the los mute function. 14 temp junction temperature sensor. attach a gr ound-referenced voltage dmm to this pin to measure the dies junction temperature (see the v cc3 pin description). leave open if not used. 15 pwrdwn_2 power-down, lvttl/lvcmos input. force high or leave open to power down inpu t channel 2. force low to enable input channel 2. the max3845 powers down if both pwrdwn_1 and pwrdwn_2 are forced high or left open. 16, 19, 22, 25, 26, 29 v cc2 positive power-supply connection. powers input channel 2 and output channels 3 and 4. downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver 6 _______________________________________________________________________________________ pin description (continued) pin name function 17, 20, 23, 27 in2_a+, in2_b+, in2_c+, in2_d+ noninverting tmds, cml input, channel 2 18, 21, 24, 28 in2_a-, in2_b-, in2_c-, in2_d- inverting tmds, cml input, channel 2 30, 61, 65, 96 in_sel4, in_sel3, in_sel2, in_sel1 input select, lvttl input. force high to select input channel 1. for ce low to select input channel 2. leave open to disable the output channel. 31, 62, 64, 95 preemph4, preemph3, preemph2, preemph1 preemphasis select, lvttl/lvcmos input. force high for 6db of output preemphasis. lea ve open for 3db of output preemphasis. force low for 0db of output preemphasis (normal). 32, 46, 80, 94 hotplug4, hotplug3, hotplug2, hotplug1 hotplug sense input. connect this pin to the displays hotplugx signa l (buffered) to allow automatic power-down of the associated output when the display is di sconnected. a low-cost quad 5v, noninverting cmos gate (74act32 series) is recommended to buffer t he max3845 from the hotplugx pin to match hotplug level specifications. if this feature is not used, connect to v cc . 33, 36, 39, 42, 45, 47, 50, 51, 54, 57, 60 gnd2 supply ground. ground connection for input cha nnel 2 and output channels 3 and 4. 34, 37, 40, 43 out4_d-, out4_c-, out4_b-, out4_a- inverting tmds, cml output, channel 4 35, 38, 41, 44 out4_d+, out4_c+, out4_b+, out4_a+ noninverting tmds, cml output, channel 4 48, 52, 55, 58 out3_d-, out3_c-, out3_b-, out3_a-, inverting tmds, cml output, channel 3 49, 53, 56, 59 out3_d+, out3_c+, out3_b+, out3_a+, noninverting tmds, cml output, channel 3 downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver _______________________________________________________________________________________ 7 pin description (continued) pin name function 63 out_level output level select, lvttl/lvcmos input. force pin low when no back terminatio n is used (11ma of tail current). force pin high when 200 back termination resistors are used (14ma of tail current). 66, 69, 72, 75, 76, 79, 81, 84, 87, 90, 93 gnd1 supply ground. ground connection for input cha nnel 1 and output channels 1 and 2. 67, 70, 73, 77 out2_d-, out2_c-, out2_b-, out2_a- inverting tmds, cml output, channel 2 68, 71, 74, 78 out2_d+, out2_c+, out2_b+, out2_a+ noninverting tmds, cml output, channel 2 82, 85, 88, 91 out1_d-, out1_c-, out1_b-, out1_a- inverting tmds, cml output, channel 1 83, 86, 89, 92 out1_d+, out1_c+, out1_b+, out1_a+ noninverting tmds, cml output, channel 1 ep ground. the exposed pad must be soldered to the circuit board ground for prope r thermal and electrical operation. downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver 8 _______________________________________________________________________________________ detailed description the max3845 2:4 dvi/hdmi fanout switch and cabledriver accept differential cml input data at rates of 250mbps up to 1.65gbps (individual channel data rate). the input portion of the device consists of two independent tmds inputs, each having four fixed-level equalizers, four limiting amplifiers, a loss-of-signal (los) detector, and power-down control. the output portion of the device consists of four independent tmds outputs, each having four multiplexers, four out- put buffers with selectable preemphasis, hotplug detection, and channel selection control (figure 1). fixed input equalization all four differential pairs on the max3845? tmdsinputs have fixed-level equalizers to compensate for 0in to 6in of fr4 pcb losses. the signal boost is approxi- mately 1db at 825mhz. if more equalization is desired, use the max3814 or max3815 in front of the max3845 to accommodate long cable lengths. limiting amplifiers limiting amplifiers follow the equalizer block to ensureproper signal levels are achieved for the multiplexers. loss-of-signal (los) detectors input channel 1 has an los detector attached to thein1_b pair. for input channel 2 the los detector is attached to the in2_c pair. if the received-signal ampli- tude is smaller than 150mv p-p (typical) at in1_b, all output channels selected to input 1 are muted.likewise, if a signal smaller than 150mv p-p (typical) is at in2_c, all output channels selected to input 2 aremuted. multiplexers each max3845 output has four multiplexers, one foreach signal pair contained in the tmds channel. these connect the output to either input 1 or input 2. the in_selx pins control the multiplexers. preemphasis drivers the preemphasis drivers have three selectable levelsof preemphasis: 0db, 3db, and 6db. the preemphasis drivers provide a precompensated signal that allows for extended length cables to be used at the output. applications information max3845 in hdmi 1.3 systems the max3845 is designed and characterized to oper-ate from 250mbps to 1.65gbps. hdmi 1.3 specifies up to 2.25gbps for 1080p ?eep color?and allows a maxi- mum data rate of 3.4gbps on each of the three data pairs. the max3845 operates normally in an hdmi 1.3 system up to 1.65gbps. the max3845 operates at data rates above 1.65gbps with reduced jitter performance. see the typical operating characteristics section for more information. max3845 in hdcp systems high-bandwidth digital content protection (hdcp) is acopy protection system employed in some dvi and most hdmi interfaces. video data is encrypted at the transmitter and decrypted at the receiver. the data scrambling is dependent upon shared keys established during the authentication protocol that occurs over the ddc channel (between the video source and the dis- play). the max3845 does not decrypt or reencrypt data. therefore, hdcp-encrypted video routed through the max3845 is only viewable on the display to which the ddc channel is connected. for applications that employ hdcp, the max3845 acts as a dual 1:4 switch and not as a fanout device. this means that one video source can be selected to drive any one of four dis- plays, but the video source cannot be replicated on more than one display at the time. fanout is possible in non-hdcp applications, allowing one video source to simultaneously drive up to four displays. output level control, back termination, and ac-coupling the out_level pin is an lvttl input that allows theuser to select between standard output drive current (11ma) or increased output drive current (14ma). the increased output current setting allows back termina- tion resistors to be used on the outputs. the use of back terminations is highly recommended for best sig- nal integrity (see figures 2 and 3). if out_level is set low, the standard output drive cur- rent (11ma) is consistent with dvi/hdmi architecture and common-mode levels. as per standard, no back termination is used so no reflected energy can be absorbed. if out_level is set high, the output drive current is increased to 14ma and allows the use of back termina- tion resistors. two options are available: a differential back termination resistor or two single-ended pullup resistors (see figures 2 and 3). downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver _______________________________________________________________________________________ 9 output macro 1 out1_[a-d]hotplug1 preemph1 in_sel1 dvi or hdmi connector pe output macro 2 out2_[a-d]hotplug2 preemph2 in_sel2 dvi or hdmi connector pe output macro 3 out3_[a-d]hotplug3 preemph3 in_sel3 dvi or hdmi connector pe output macro 4 out4_[a-d]hotplug4 preemph4 in_sel4 dvi or hdmi connector pe out_level eq eq la los 1 - >mute pd input macro 1 in1_[a-d] clklos pwrdwn_1 losmute_en example: max3815 eq eq la los 2 - >mute pd input macro 2 in2_[a-d] clklos pwrdwn_2 temp (die temp sense) example: max3815 2:4 dvi fanoutswitch and cable driver analog temp sense power-down logic for each of 4 output macros pwrdwn_ [output macro x], where x = 1, 2, 3, or 4, if: [pwrdwn_1 = low] or [los 1 = high] and [in_selx = high] or [pwrdwn_2 = high] or [los 2 = high] and [in_selx = low] or [in_selx = open] [hotplugx = low or open] on-chip signal:power-down output macro x high low open decoder in_selx r 2 x r figure 1. functional diagram downloaded from: http:///
max3845 back termination greatly reduces signal degradationcaused by reflections coming off dvi/hdmi connectors and any other transmission line discontinuities. much of the reflected energy off a dvi connector, for example, is absorbed by the back termination resistance rather than reflected forward, causing eye closure. for the cases shown in figures 2 and 3, the return loss is approximately 9.5db. in other words, about 90% of the reflected energy is absorbed by the back termination resistors. maxim strongly recommends using back ter- mination to maximize the max3845? performance. the differential back termination options reduce thecommon-mode output voltage seen by the tmds receiver to approximately v cc - 350mv (table 1). the single-ended back termination option allows forac-coupling between the max3845 and a tmds receiver, so long as the tmds receiver is tolerant of an input common-mode voltage equal to v cc (hdmi 1.2 or later). dvi/hdmi 2:4 tmds fanout switch and cable driver 10 ______________________________________________________________________________________ max3845 50 200 * or 300 * tmds output pair 50 +3.3v rx tmds receiver z 0(diff) = 100 *back termination resistor is located as close as possible to the max3845. figure 2. dc-coupled differential back termination max3845 50 tmds output pair 50 +3.3v 100 * 100 * +3.3v rx tmds receiver z 0(diff) = 100 *back termination resistors are located as close as possible to the max3845. 0.1 f 0.1 f figure 3. ac-coupled single-ended back termination downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver ______________________________________________________________________________________ 11 temperature sense pin 14, temp, allows the on-die temperature to besensed as an analog voltage output. to sense the die temperature, measure the dc voltage at temp. the approximate die temperature can be determined using the following equation: t j = (v temp - 0.93) x 297 also see the typical operating characteristics section for more information. power-down the power-down inputs (pwrdwn_1 and pwrdwn_2)reduce power consumption by powering down the cho- sen input and all outputs that are selected to that input. for example, when output channels 1 and 4 are select- ed to transmit input channel 2, and channel 2 is pow- ered down, both outputs 1 and 4 are also powered down. hotplug detect each output channel has a hotplugx detection pinassociated with it. this pin is designed to detect whether a monitor? hotplug connection is attached. if hotplugx is low (less than 1.5v), the associated out- put is powered down. if hotplugx is higher than v cc - 0.2v, up to 5.5v, the associated output is pow- ered up. activating an output several things must occur for an output to be active.table 2 lists the required inputs to enable an output. cable selection good quality cable is recommended for good perfor-mance. deterministic jitter (dj) can be caused by dif- ferential-to-common-mode conversion (or vice versa) within a twisted pair (stp or utp), usually a result of cable twist or dielectric imbalance. refer to application note hfan-4.5.4: ?itter happens?when a twisted pair is unbalanced for more information. voltages at the input of the tmds receiver (typical) conditions v diff v cm v h v l preemph = low, out_level = low (output drive current = 11ma) no back termination 1100mv p-p v cc - 275mv v cc v cc - 550mv preemph = low, out_level = high (output drive current = 14ma) differential 200 back terminations (dc-coupled) 950mv p-p v cc - 350mv v cc - 120mv v cc - 585mv differential 300 back terminations (dc-coupled) 1 050mv p-p v cc - 350mv v cc - 90mv v cc - 615mv single-ended, 2x 100 back terminations (ac-coupled) 950mv p-p v cc v cc + 240mv v cc - 240mv table 1. output levels with and without back termination output state in_sel condition hotplug condition pwrdwn_1 condition pwrdwn_2 condition los 1 condition los 2 condition input 1 high high low dont care low dont care input 2 low high dont care low dont care low table 2. output enable requirements downloaded from: http:///
max3845 layout considerations the data inputs and outputs are the max3845? mostcritical paths, and great care should be taken to mini- mize discontinuities on these transmission lines between the connector and the ic. here are some sug- gestions for maximizing the performance of the max3845: maintain 100 differential transmission line imped- ance into and out of the max3845. the data and clock inputs should be wired directly between the cable connector and ic without stubs. an uninterrupted ground plane should be posi- tioned beneath the high-speed i/os. ground path vias should be placed close to the ic and the input/output interfaces to allow a return cur-rent path to the ic and the dvi/hdmi cable. use good high-frequency layout techniques and multilayer boards with an uninterrupted groundplane to minimize emi and crosstalk. for more information, refer to the schematic and boardlayers of the maxim evaluation kit, max3845evkit . exposed-pad package and thermal considerations the exposed pad on the 100-pin tqfp-ep provides avery low thermal resistance path for heat removal from the ic. the pad is also electrical ground on the max3845 and must be soldered to the circuit board ground for proper thermal and electrical performance. refer to maxim application note hfan-08.1: thermal considerations of qfn and other exposed-paddle packages for additional information. because the max3845 is a high-power device, it isimportant to ensure that good heat dissipation is incor- porated into the pcb design. the device? temperature- sense pin (temp) allows estimation of the junction temperature to be made while the max3845 is operat- ing. this information can be used to determine if the pcb layout is dissipating heat properly. dvi/hdmi 2:4 tmds fanout switch and cable driver 12 ______________________________________________________________________________________ interface models max3845 equalization network 50 v cc 50 v cc tmds input+ tmds input- figure 4. simplified input circuit schematic max3845 tmdsoutput+ tmds output- tvs* tvs* *tvs is a "transient voltage suppressor" clamp-circuit. figure 5. simplified output circuit schematic downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver ______________________________________________________________________________________ 13 gnd1out2_b+ gnd1 out2_c+ out2_d+ out2_d- gnd2 out2_c-gnd1 out2_b- gnd1preemph2 out_level gnd2 out3_a+ preemph3in_sel3 in_sel2 gnd2out3_b+ out3_c+ out3_c- out3_b-gnd2 out3_a- int1_b- v cc1 in1_c+ v cc1 in1_d+ in1_d- v cc2 int1_b+ v cc1 12 3 4 5 6 7 8 9 1011 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 100 7574 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 in_sel4 preemph4 hotplug4 out4_d- gnd2 v cc2 in2_d- in2_d+ v cc2 in1_a-in1_a+ v cc1 in_sel1preemph1 hotplug1 gnd1 out1_a+ out1_a-gnd1 out1_b+ out1_b- gnd1 out1_c+ gnd1 out1_d+out1_d- gnd1 hotplug2 gnd1 out2_a+ out2_a- gnd1 v cc1 max3845 top view in1_c- pwrdwn_1 v cc3 losmute_en pwrdwn_2 v cc2 in2_a+ v cc1 temp in2_a- v cc2 in2_b+ v cc2 in2_c+ in2_c- in2_b- out4_c+ gnd2 out4_b- gnd2 out4_c- gnd2 out4_d+ out4_b+ gnd2 hotplug3 gnd2 out3_d+ out4_a+ out4_a- out3_d- tqfp-ep* *exposed pad must be connected to ground. gnd2 out1_c- + pin configuration downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver 14 ______________________________________________________________________________________ max3845 dvi/hdmi dual 1:4 switch configuration hdcp* application movie with hdcp off sports with hdcp off hdmi/dvi cable hdmi/dvi cable hdmi/dvi cable hdmi/dvi cable hdmi/dvi cable hdmi/dvi cable movie with hdcp blu-ray?, hd-dvd, cable stb, satellite stb sports with hdcp blu-ray, hd-dvd, cable stb, satellite stb driver selects (8) in_selx: high = input 1, open = off, low = input 2 preemphx: high = 6db, open = 3db, low = 0db * because the max3845 is a transparent switch, hdcp sources can only be connected to one hdcp-compliant display at a time and cannot be fanned out through the max3845. blu-ray is a trademark of blu-ray disc association. typical operating circuits (continued) downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver ______________________________________________________________________________________ 15 max3845 dvi/hdmi 2:4 fanout buffer max3815 dvi/hdmi equalizer non-hdcp application video footage video display computer graphics video display hdmi/dvi cable hdmi/dvi cable hdmi/dvi cable pcb traces pcb traces eq long hdmi cable hdmi/dvi cable graphics asic scaling and picture processing engine with tdms output driver selects (8) in_selx: high = input 1, open = off, low = input 2 preemphx: high = 6db, open = 3db, low = 0db for applications that are not hdcp encoded, the max3845 can be used to fan out dvi and hdmi signals. video footage video capture card on pc/mac computer graphics video card on pc/mac computer graphics video display typical operating circuits (continued) downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver 16 ______________________________________________________________________________________ max3845 dvi/hdmi dual 1:4 switch configuration 1 1 50 50 26 26 100 50 76 26 side view 4 x 4 matrix application max3845 dvi/hdmi 2:4 fanout buffer driver selects 2x(8) in_selx (part a): high = input 2, open = off, low = input 4in_selx (part b): high = input 1, open = off, low = input 3 preemphx: high = 6db, open = 3db, low = 0db for 4 x 4 matrix operation, two max3845 parts are located on either side of the board with the axis of rotation about pins 13 and 63. input 1 output 1output 2 output 3 output 4 part b part a input 3 input 2input 4 top view typical operating circuits (continued) downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver ______________________________________________________________________________________ 17 max3845 dvi/hdmi 2:4 fanout switch and cable driver 2:8 fanout/switch application (8) minimumloss power splitters max3845 dvi/hdmi 2:4 fanout switch and cable driver output 1 input 1 output 2output 3 output 4 output 5 output 6 output 7 output 8 (8) minimumloss power splitters max3814 dvi/hdmi cable equalizer and driver (use 200 back term) input 2 max3814 dvi/hdmi cable equalizer and driver (use 200 back term) 16 16 16 50 matched minimum loss power splitter: through loss (any port to any port) is 6db. signal 1 z 0 = 50 signal 3 z 0 = 50 signal 2 z 0 = 50 typical operating circuits (continued) downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver 18 ______________________________________________________________________________________ package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) 14x14x1.00l tqpf, exp. pad.eps package outline, 100l tqfp 21-0116 2 1 d 14x14x1.00mm with exposed pad option downloaded from: http:///
max3845 dvi/hdmi 2:4 tmds fanout switch and cable driver 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 19 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) package outline, 100l tqfp 21-0116 2 2 d 14x14x1.00mm with exposed pad option downloaded from: http:///

▲Up To Search▲

Price & Availability of MAX3845UCQD

	To Download MAX3845UCQD Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .