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www.gennum.com gs1575a / GS9075A hd-linx? ii multi-rate sdi automatic reclocker gs1575a / GS9075A data sheet 34716 - 0 december 2005 1 of 29 features gs1575a ? smpte 292m, 259m and 344m compliant ? supports data rates of 143, 177, 270, 360, 540, 1483.5, 1485 mb/s ? supports dvb-asi at 270mb/s ? pb-free and rohs compliant ? auto and manual modes for rate selection ? standards indication in auto mode ? 4:1 input multiplexer ? loss of signal (los) output ? lock detect output ? on-chip input and output termination ? differential 50 inputs and outputs ? mute, bypass and autobypass functions ? sd/hd indication output to control gs1528a dual slew-rate cable driver ? single 3.3v power supply ? operating temperature range: 0c to 70c GS9075A ? smpte 259m and 344m compliant ? supports data rates of 143, 177, 270, 360, and 540mb/s ? supports dvb-asi at 270mb/s ? pb-free and rohs compliant ? auto and manual modes for rate selection ? standards indication in auto mode ? 4:1 input multiplexer ? loss of signal (los) output ? lock detect output ? on-chip input and output termination ? differential 50 inputs and outputs ? mute, bypass and autobypass functions ? single 3.3v power supply ? operating temperature range: 0c to 70c applications gs1575a ? smpte 292m, smpte 259m and smpte 344m serial digital interfaces GS9075A ? smpte 259m and smpte 344m serial digital interfaces. description the gs1575a/9075a is a multi-rate serial digital reclocker designed to automatically recover the embedded clock from a digital video signal and re-time the incoming video data. the gs1575a serial digital reclocker will recover the embedded clock signal and re-time the data from a smpte 292m, smpte 25 9m or smpte 344m compliant digital video signal. the GS9075A serial digital reclocker will recover the embedded clock signal and re-time the data from a smpte 259m or smpte 344m compliant digital video signal. the gs1575a/9075a removes the high frequency jitter components from the bit-serial stream. input termination is on-chip for seamless matching to 50 transmission lin es. an lvpecl co mpliant output interfaces seamlessly to the gs1578a/gs9078a cable driver. the gs1575a/9075a can operate in either auto or manual rate selection mode. in auto mode the device will automatically detect and lock onto incoming smpte sdi data signals at any supp orted rate. for single rate data systems, the gs1575a/9075a can be configured to operate in manual mode. in both modes, the device requires only one external crystal to set the vco frequency when not locked and provides adjustment free operation. in systems which require passing of non-smpte data rates, the gs1575a/9075a can be configured to either automatically or manually enter a bypass mode in order to pass the signal without reclocking. the asi/177 input pin allows for manual selection of support of either 177mb/s or dvb-asi inputs. the gs1575a/9075a is pb-free, and the encapsulation compound does not contain halogenated flame retardant. this component and all homogeneous sub-components are rohs compliant.
gs1575a / GS9075A data sheet 34716 - 0 december 2005 2 of 29 gs1575a functional block diagram GS9075A functional block diagram xtal+ xtal- xtal out- xtal out+ ddi_sel[1:0] ddi 1 ddi 2 ddi 3 ddi 0 lf+ lf- kbb ddo_mute ddo/ddo autobypass bypass ld auto/man ss[2:0] asi/177 xtal osc buffer data buffer vco bypass logic divide by 2,4,6,8,12,16 phase frequency detector divide by 152, 160, 208 control logic charge pump m u x d a t a m u x m u x re-timer phase detector sd/hd sco_enable sco/sco clock buffer los xtal+ xtal- xtal out- xtal out+ ddi_sel[1:0] ddi 1 ddi 2 ddi 3 ddi 0 lf+ lf- kbb ddo_mute ddo/ddo autobypass bypass ld auto/man ss[2:0] asi/177 xtal osc buffer data buffer vco bypass logic divide by 2,4,6,8,12 phase frequency detector divide by 152, 160 control logic charge pump m u x d a t a m u x m u x re-timer phase detector sd/hd sco_enable sco/sco clock buffer los
gs1575a / GS9075A data sheet 34716 - 0 december 2005 3 of 29 contents features ....................................................................................................................... .1 applications................................................................................................................... 1 description .................................................................................................................... 1 1. pin out ..................................................................................................................... .4 1.1 gs1575a pin assignment ... .............. .............. .............. .............. ........... ........4 1.2 GS9075A pin assignment ... .............. .............. .............. .............. ........... ........5 1.3 pin descriptions ..............................................................................................6 2. electrical characteristics ...........................................................................................9 2.1 absolute maximum ratings ............................................................................9 2.2 dc electrical characteristics ............... ...........................................................9 2.3 ac electrical characteristics .............. ...........................................................10 2.4 solder reflow profiles ...................................................................................13 3. input / output circuits ............................ .................................................................14 4. detailed description .................................. ..............................................................17 4.1 slew rate phase lock loop (s-pll) .. .........................................................17 4.2 vco ..............................................................................................................18 4.3 charge pump ................................................................................................18 4.4 frequency acquisition loop ? the phas e-frequency detector ..................19 4.5 phase acquisition loop ? the phase detector ...........................................19 4.6 4:1 input mux ................................................................................................20 4.7 automatic and manual data rate select ion .................................................20 4.8 bypass mode ................................................................................................21 4.9 dvb-asi operation .......................................................................................21 4.10 lock and los .............................................................................................22 4.11 output drivers and serial clock output s ....................................................22 4.12 output mute ................................................................................................23 5. typical application circuits .....................................................................................24 6. package & ordering information .............................................................................26 6.1 package dimensions ....................................................................................26 6.2 recommended pcb footprint ............. .............. ............ ........... ........... .........27 6.3 packaging data .............................................................................................28 6.4 ordering information .....................................................................................28 7. revision history ......................................................................................................29
gs1575a / GS9075A data sheet 34716 - 0 december 2005 4 of 29 1. pin out 1.1 gs1575a pin assignment figure 1-1: 64-pin qfn ddi0 gnd 64-pin qfn (top view) 1 ddi0_vtt ddi0 gnd ddi1 ddi1_vtt ddi1 gnd ddi2 ddi2_vtt ddi2 gnd ddi3 ddi3_vtt ddi3 gnd lf+ nc nc nc nc nc xtal- xtal+ xtal_out- xtal_out+ gnd vee_ddo vcc_ddo nc gnd_drv vee_sco vcc_sco sco nc gnd sco_enable sco kbb ddi_sel0 ddi_sel1 bypass autobypass vcc_vco vee_vco locked ss0 ss1 ss2 los vcc_dig vee_dig gnd vcc_cp vee_cp asi/177 ddo ddo 16 17 32 33 48 49 64 2 3 4 5 6 7 8 9 10 11 12 13 14 15 18 19 20 21 23 24 25 26 27 28 29 30 31 22 34 35 36 37 38 39 40 41 42 43 44 45 46 47 50 51 52 53 54 55 56 57 58 59 60 61 62 63 lf- ground pad (bottom of package) nc auto/man ? ? ? ? ddo_mute sd/hd gs1575a ?
gs1575a / GS9075A data sheet 34716 - 0 december 2005 5 of 29 1.2 GS9075A pin assignment figure 1-2: 64-pin qfn ddi0 gnd 64-pin qfn (top view) 1 ddi0_vtt ddi0 gnd ddi1 ddi1_vtt ddi1 gnd ddi2 ddi2_vtt ddi2 gnd ddi3 ddi3_vtt ddi3 gnd lf+ nc nc nc nc nc xtal- xtal+ xtal_out- xtal_out+ gnd vee_ddo vcc_ddo nc gnd_drv vee_sco vcc_sco sco nc gnd sco_enable sco kbb ddi_sel0 ddi_sel1 bypass autobypass vcc_vco vee_vco locked ss0 ss1 ss2 los vcc_dig vee_dig gnd vcc_cp vee_cp asi/177 ddo ddo 16 17 32 33 48 49 64 2 3 4 5 6 7 8 9 10 11 12 13 14 15 18 19 20 21 23 24 25 26 27 28 29 30 31 22 34 35 36 37 38 39 40 41 42 43 44 45 46 47 50 51 52 53 54 55 56 57 58 59 60 61 62 63 lf- ground pad (bottom of package) nc auto/man ? ? ? ? ddo_mute sd GS9075A ?
gs1575a / GS9075A data sheet 34716 - 0 december 2005 6 of 29 1.3 pin descriptions table 1-1: pin descriptions pin number name type description 1, 3 ddi0, ddi0 input serial digital differential input 0. 2 ddi0_vtt passive center tap of two 50 on-chip termination resistors between ddi0 and ddi0 . 4, 8, 12,16, 32, 37, 43, 49, 64 gnd passive recommended connect to gnd. 5, 7 ddi1,ddi1 input serial digital differential input 1. 6 ddi1_vtt passive center tap of two 50 on-chip termination resistors between ddi1 and ddi1 . 9, 11 ddi2, ddi2 input serial digital differential input 2. 10 ddi2_vtt passive center tap of two 50 on-chip termination resistors between ddi2 and ddi2 . 13, 15 ddi3, ddi3 input serial digital differential input 3. 14 ddi3_vtt passive center tap of two 50 on-chip termination resistors between ddi3 and ddi3 . 17, 18 ddi_sel[1:0] logic input serial digital input select. 19 bypass logic input bypass the reclocker stage. when bypass is high, it overwrites the autobypass setting. 20 autobypass logic input automatically bypasses t he reclocker stage when the pll is not locked this pin is ignored when bypass is high. 21 auto/man logic input auto/manual select. when set high, the standard is automatically detected from the input data rate. when set low, the user must program the input standard using the ss[2:0] pins. 22 vcc_vco power most positive power supply connection fo r the internal vco section. connect to 3.3v. 23 vee_vco power most negative power supply connecti on for the internal vco section. connect to gnd. ddi_sel1 ddi_sel0 input selected 0 0 ddi0 0 1 ddi1 1 0 ddi2 1 1 ddi3
gs1575a / GS9075A data sheet 34716 - 0 december 2005 7 of 29 24, 25, 26 ss[2:0] bi-directional when auto/man is high, ss[0:2] are outputs, displaying the data rate to which the pll has locked. when auto/man is low, ss[0:2] are inputs, forcing the pll to lock only to a selected data rate . 27 asi/177 logic input when set high, the device disables the 177mb/s data rate in the data rate detection circuit. this prevents a fals e lock to 177mb/s when using dvb-asi. when set low, 177mb/s lock is possible , however, if a 270mb/s asi signal is applied, the device could false lock to the 177mhz signal. 28 locked output lock detect. this pin is set high by the device when the pll is locked. 29 los output loss of signal. set high when there are no transitions on the active ddi[3:0] input. see lock and los on page 22 . 30 vcc_dig power most positive power suppl y connection for the internal glue logic. connect to 3.3v. 31 vee_dig power most negative power supply connection for the internal glue logic. connect to gnd. 33 sd/hd (gs1575a only) output this signal will be set low by the device when the reclocker has locked to 1.485gbps or 1.485/1.001gbps, or when a non-smpte standard is applied (i.e. the device is not locked). it will be set high when the reclocker has locked to 143mbps, 177mbps, 270mbps, 360mbps, or 540mbps. 33 sd (GS9075A only) output this signal will go high when the recl ocker has locked to the input sd signal. it will be low otherwise. 34 kbb analog input controls the loop bandwidth of the pll. leave this pin floating for seri al reclocking applications. 35 sco_enable power serial clock output enable. connect to vcc to enable the serial clock output. connect to gnd to disable the serial clock output. note: this is not a ttl signal input. table 1-1: pin descriptions (continued) pin number name type description ss2 ss1 ss0 data rate selected/forced (mb/s) 0 0 0 143 0 0 1 177 0 1 0 270 0 1 1 360 1 0 0 540 1 0 1 1483.5/1485
gs1575a / GS9075A data sheet 34716 - 0 december 2005 8 of 29 36 ddo_mute logic input mutes the ddo/ddo outputs. this option is not available in bypass mode. 38, 40 sco , sco output serial clock output. when sco_enable is set high, a serial digital differential clock will be presented to the application layer at the selected data rate. 39, 45, 54 - 59 nc no connect not connected internally. 41 vcc_sco power most positive power supply connection for the sco/sco output driver. connect to 3.3v. 42 vee_sco power most negative power supply connection for the sco/sco output driver. connect to gnd. 43 gnd_drv passive recommended connect to gnd. 44, 46 ddo , ddo output differential serial digital outputs. 47 vcc_ddo power most positive powe r supply connection for the ddo/ddo output driver. connect to 3.3v. 48 vee_ddo power most negative power supply connection for the ddo/ddo output driver. connect to gnd. 50, 51 xtal_out+, xtal_out- output differential outputs of the reference oscillator used for monitoring or test purposes. 52, 53 xtal+, xtal- input reference crystal input. connect to the go1535 as shown in the typical application circuits on page 24 . 60 vee_cp power most negative power supply c onnection for the internal charge pump. connect to gnd. 61 vcc_cp power most positive power supply connec tion for the internal charge pump. connect to 3.3v. 62, 63 lf+, lf- passive loop filter capacito r connection. connect as shown in the typical application circuits on page 24 . ? center pad ? ground pad on bottom of package. solder to main ground plane following recommendations under recommended pcb footprint on page 27 . table 1-1: pin descriptions (continued) pin number name type description
gs1575a / GS9075A data sheet 34716 - 0 december 2005 9 of 29 2. electrical characteristics 2.1 absolute maximum ratings 2.2 dc electrical characteristics parameter value supply voltage +3.6 v dc input voltage vcc + 0.5v operating temperature range 0c to 70c storage temperature range -50c < t s < 125c input esd voltage 1kv solder reflow temperature 260c table 2-1: dc electrical characteristics v cc = 3.3v, t a = 0c to 70c, unless otherwise shown parameter symbol conditions min typ max units supply voltage v cc operating range 3.135 3.3 3.465 v supply current i cc sco enabled, t a =25c ? 215 260 ma i cc sco disabled, t a =25c ? 195 230 ma power consumption ? sco enabled, t a =25c ? 710 ? mw ? sco disabled, t a =25c ? 645 ? mw logic inputs ddi_sel[1:0], bypass, autobypass, auto/man , asi/177 , ddo_mute v ih high 2.0 ? ? v v il low ? ? 0.8 v logic outputs sd/hd , locked, los v oh 250ua load 2.8 ? ? v v ol 250ua load ? ? 0.5 v bi-directional pins (manual mode) ss[2:0], auto/man = 0 v ih high 2.0 ? ? v v il low ? ? 0.8 v
gs1575a / GS9075A data sheet 34716 - 0 december 2005 10 of 29 2.3 ac electrical characteristics bi-directional pins (auto mode) ss[2:0], auto/man = 1 v oh high, 250ua load 2.8 ? ? v v ol low, 250ua load ? ? 0.5 v xtal_out+, xtal_out- v oh high ? v cc ?v v ol low ? v cc - 0.285 ? v sco_enable ? 1.5ma of current delivered v cc - 0.165 ? v cc + 0.165 v serial input voltage ? common mode 1.65 + (v sid /2) ?v cc - (v sid /2) v serial output voltage sdo/sdo , sco/sco ? common mode ? v cc - (v od /2) ? v table 2-1: dc electrical characteristics (continued) v cc = 3.3v, t a = 0c to 70c, unless otherwise shown parameter symbol conditions min typ max units table 2-2: ac electrical characteristics v cc = 3.3v, t a = 0c to 70c, unless otherwise shown parameter symbol conditions min typ max units serial input data rate ? gs1575a 143 ? 1485 mb/s ? GS9075A 143 ? 540 mb/s serial input jitter tolerance ? worst case modulation (e.g. square wave modulation) 143, 270, 360, 1485 mb/s 0.8 ? ? ui pll lock time - asynchronous t alock ???10ms pll lock time - synchronous t slock c lf =47nf, sd/hd =0 ? ? 10 us t slock c lf =47nf, sd/hd =1 ? ? 39 us serial output rise/fall time sdo/sdo and sco/sco (20% - 80%) t rsdo ,t rsco 50 load (on chip) ? 114 ? ps t fsdo ,t fsco 50 load (on chip) ? 106 ? ps serial digital input signal swing v sid differential with internal 100 input termination see figure 2-1 100 ? 800 mv p-p serial digital output signal swing sdo/sdo and sco/sco v od 100 load differential see figure 2-2 1400 1600 2200 mv p-p
gs1575a / GS9075A data sheet 34716 - 0 december 2005 11 of 29 serial output jitter sdo/sdo and sco/sco kbb = float prn, 2 23 -1 measurement is output jitter that includes input jitter from bert. t oj 143 mb/s ? 0.02 ? ui t oj 177 mb/s ? 0.02 ? ui t oj 270 mb/s ? 0.02 0.09 ui t oj 360 mb/s ? 0.03 ? ui t oj 540 mb/s ? 0.03 0.09 ui t oj 1485 mb/s (gs1575a only) ? 0.06 0.13 ui t oj bypass ? 0.06 0.13 ui loop bandwidth bw loop 1.485 gb/s, kbb = float (gs1575a only) ?1.75?mhz bw loop 1.485 gb/s, kbb = gnd, <0.1db peaking (gs1575a only) ?3.2?mhz bw loop 270 mb/s, kbb = float ? 520 ? khz bw loop 270 mb/s, kbb = gnd ? 1000 ? khz table 2-2: ac electrical characteristics (continued) v cc = 3.3v, t a = 0c to 70c, unless otherwise shown parameter symbol conditions min typ max units
gs1575a / GS9075A data sheet 34716 - 0 december 2005 12 of 29 figure 2-1: serial digita l input signal swing figure 2-2: serial digital output signal swing v sid v sid 2 v sid 2 v sid 2 + 0 v sid 2 _ v sid 2 v cc _ v sid 2 v cc _ v cc v dd single-ended swing (ddix) single-ended swing (ddix) differential swing (ddix-ddix) v od v od 2 v od 2 v od 2 + 0 v od 2 _ v od 2 v cc _ v od 2 v cc _ v cc v dd single-ended swing (ddo, sco) single-ended swing (ddo, sco) differential swing (ddo-ddo) (sco-sco)
gs1575a / GS9075A data sheet 34716 - 0 december 2005 13 of 29 2.4 solder reflow profiles the device is manufactured with matte-sn te rminations and is compatible with both standard eutectic and pb-free solder re flow profiles. msl qualification was performed using the maximum pb-free reflow profile shown in figure 2-3 . the recommended standard pb reflow profile is shown in figure 2-4 . figure 2-3: maximum pb-free solder reflow profile (preferred) figure 2-4: standard pb solder reflow profile (pb-free package) 25?c 150?c 200?c 217?c 260?c 250?c time temperature 8 min. max 60-180 sec. max 60-150 sec. 20-40 sec. 3?c/sec max 6?c/sec max 25?c 100?c 150?c 183?c 230?c 220?c time temperature 6 min. max 120 sec. max 60-150 sec. 10-20 sec. 3?c/sec max 6?c/sec max
gs1575a / GS9075A data sheet 34716 - 0 december 2005 14 of 29 3. input / output circuits figure 3-1: ttl inputs figure 3-2: loop filter figure 3-3: crystal input v ref lf+ lf- 5k 10p 250r 250r 5k xtal+ xtal-
gs1575a / GS9075A data sheet 34716 - 0 december 2005 15 of 29 figure 3-4: crystal output buffer figure 3-5: serial data outp uts, serial clock outputs figure 3-6: kbb 1k 1k xtal out- xtal out+ 50 sdo/sco sdo/sco 50 500r v ref kbb
gs1575a / GS9075A data sheet 34716 - 0 december 2005 16 of 29 figure 3-7: indicator outputs: sd/hd , locked, los figure 3-8: standard select/indication bi-directional pins figure 3-9: serial data inputs v ref ss[2:0] 50 ddi[3:0] ddi[3:0] 1k 1k 50 ddi_vtt
gs1575a / GS9075A data sheet 34716 - 0 december 2005 17 of 29 4. detailed description the gs1575a/9075a is a multi-rate se rial digital reclocker designed to automatically recover the embedded clock from a digital video signal and re-time the incoming video data. the gs1575a will recover the em bedded clock signal and re-time the data from a smpte 292m, smpte 259m or smpte 344m compliant digital video signal. the GS9075A will recover the em bedded clock signal and re-time the data from a smpte 259m or smpte 344m compliant digital video signal. using the functional block diagram ( page 2 ) as a guide, slew rate phase lock loop (s-pll) on page 17 to output mute on page 23 describes each aspect of the gs1575a/9075a in detail. 4.1 slew rate phase lock loop (s-pll) the term ?slew? refers to the output phase of the pll in response to a step change at the input. linear plls have an output phase response characterized by an exponential response whereas an s-pll?s output is a ramp response (see figure 4-1 ). because of this non-linear response characteristic, traditional small signal analysis is not possible with an s-pll. figure 4-1: pll characteristics 0.2 0.1 0.0 input output slew pll response phase (ui) 0.2 0.1 0.0 input output linear (conventional) pll response phase (ui)
gs1575a / GS9075A data sheet 34716 - 0 december 2005 18 of 29 the s-pll offers several advantages over the linear pll. the loop bandwidth of an s-pll is independent of the transition density of the input data. pseudo-random data has a transition density of 0.5 ve rses a pathological signal which has a transition density of 0.05 . the loop bandwidth of a linear pll will change proportionally with this change in transition density. with an s-pll, the loop bandwidth is defined by the jitter at the data input. this translates to infinite loop bandwidth with a zero jitter input signal. this allows the loop to correct for small variations in the input jitte r quickly, resulting in very low output jit ter. the loop bandwidth of the gs1575a/9075a?s pll is defined at 0.2ui of input jitter. the pll consists of two acquisition loops. first is the frequency acquisition (fa) loop. this loop is active when the device is not locked and is used to achieve lock to the supported data rates. second is the phase acquisition (pa) loop. once locked, the pa loop tracks the incoming data and makes phased corrections to produce a re-clocked output. 4.2 vco the internal vco of the gs1 575a/9075a is a ring oscillato r. it is trimmed at the time of manufacture to capture all dat a rates over temperature and operation voltage ranges. integrated into the vco is a series of programmable dividers used to achieve all serial data rates, as well as additional dividers for the frequency acquisition loop. 4.3 charge pump a common charge pump is used for the pll of the gs1575a/9075a. during frequency acquisition, the charge pump has two states, ?pump-up? and ?pump-down,? which is produced by a leading or lagging phase difference between the input and the vco frequency. during phase acquisition, there are two levels of ?pump-up? and two levels of ?pump down? produced for leading and l agging phase difference between the input and vco frequency. this is to allow for greater precision of vco control. the charge pump produces these signal s by holding the integrated frequency information on the external loop-filter capacitor, c lf . the instantaneous frequency information is the result of the curren t flowing through an internal resistor connected to the loop-filter capacitor.
gs1575a / GS9075A data sheet 34716 - 0 december 2005 19 of 29 4.4 frequency acquisition loop ? the phase-frequency detector an external crystal of 14.140 mhz is us ed as a reference to keep the vco centered at the last known data rate. this allows the device to achieve a fast synchronous lock, especially in cases where a known data rate is interrupted. the crystal reference is also used to clock internal timers and counters. to keep the optimal performance of the reclocker over all ope rating conditions, the crystal frequency must be 14.140 mhz, +/-50ppm. the go 1535 meets this specification and is available from gennum. the vco is divided by a selected ratio which is dependant on the input data rate. the resultant is then compared to the crystal frequency. if the divided vco frequency and the crystal frequency are within 1% of each other, the pll is considered to be locked to the input data rate. 4.5 phase acquisition loop ? the phase detector the phase detector is a digital quadrature phase detector. it indicates whether the input data is leading or lagging with respect to a clock that is in phase with the vco (i-clk) and a quadrature clock (q-clk). when the phase acquisition loop (pa loop) is locked, the input data transition is aligned to the falling edge of i-clk and the output data is re-timed on t he rising edge of i-clk. during high input jitter conditions (>0.25ui), q-clk will sample a different value than i-clk. in this condition, two extra phase correction signals will be generat ed which instructs the charge pump to create larger frequency corrections for the vco. figure 4-2: phase detector characteristics when the pa loop is active, the crystal frequency and the incoming data rate are compared. if the resultant is more that 2%, the pll is considered to be unlocked and the system jumps to the fa loop. i-phase alignment edge data re-timing edge q-phase alignment edge 0.25ui 0.8ui i-clk q-clk input data with jitter re-timed output data
gs1575a / GS9075A data sheet 34716 - 0 december 2005 20 of 29 4.6 4:1 input mux the 4:1 input mux allows the connection of four independent streams of video/data. there are four differential inputs (ddi[3:0] and ddi[3:0] ). the active channel can be selected via the ddi_sel[1:0] pins. table 4-1 shows the input selected for a given state at ddi_sel[1:0]. the ddi inputs are designed to be dc interfaced with the output of the gs1524a/9064a cable equalizer. there are on chip 50 termination resistors which come to a common point at the ddi_vt pins. connect a 10nf capacitor to this pin and connect the other end of the capacitor to ground. this terminates the transmission line at the inputs for optimum performance. if only one input pair is used, connect t he unused positive inputs to +3.3v and leave the unused negative inputs floating. this helps to eliminate crosstalk from potential noise that would couple to the unused input pair. 4.7 automatic and manual data rate selection the gs1575a/9075a can be configured to manually lock to a specific data rate or automatically search for and lock to the incoming data rate. the auto/man pin selects automatic data rate detection mode (auto mode) when high and manual data rate selection mode (manual mode) when low. in auto mode, the ss[2:0] bi-directional pins become outputs and the bit pattern indicates the data rate that the pll is lo cked to (or previously locked to). the "search algorithm" cycles throug h the data rates and starts over if that data rate is not found (see figure 4-3 ). figure 4-3: data rate search pattern table 4-1: bit pattern for input select ddi_sel[1:0] selected input 00 ddi0 01 ddi1 10 ddi2 11 ddi3 143 mb\s 177 mb\s 270mb\s 360 mb\s 540 mb\s power-up 1.485mb\s (gs1575a only)
gs1575a / GS9075A data sheet 34716 - 0 december 2005 21 of 29 in manual mode, the ss[2:0] pins becom e inputs and the data rate can be programmed by the application layer. in this mode, the search algorithm is disabled and the pll will only lock to the data rate selected. table 4-2 shows the ss[2:0] pin settings for either the data rate selected (in manual mode) or the data rate that the pll has locked to (in auto mode). 4.8 bypass mode in bypass mode, the gs1575a/9075a passes the data at the inputs directly to the outputs. there are two pins that control the bypass function: bypass and autobypass. when bypass is set high by the applic ation layer, the gs1575a/9075a will be in bypass mode. when autobypass is set high by the application la yer, the gs1575a/9075a will be configured to enter bypass mode only when the pll has not locked to a data rate. when bypass is set high, autobypass will be ignored. when the pll is not lo cked, and both bypass and autobypass are set low, the serial digital output ddo/ddo will produce invalid data. 4.9 dvb-asi operation the gs1575a/9075a will also re-clock dvb-asi at 270 mb/s. when reclocking dvb-asi data set the asi/177 pin high to prevent a false lock to 177mb/s. if asi/177 is not set high, a false lock may occur since there is a harmonic present in idle patterns (k28.5) which is very close the 177 mb/s data rate (eic 1179). note that setting the asi/177 pin high will disable the 177 mb/s search when the device is in auto mode, consequent ly the gs1575a/9 075a will not lock to that data rate. table 4-2: data rate indication/selection bit pattern ss[2:0] data rate (mb/s) 000 143 001 177 010 270 011 360 100 540 101* 1485/1483.5 * this setting only applies to the gs1575a. for the GS9075A, when auto/man is low, the pin settings ss[0:2] = 101 will be ignored by the device.
gs1575a / GS9075A data sheet 34716 - 0 december 2005 22 of 29 4.10 lock and los the locked signal is an active high output which indicates when the pll is locked. the internal lock logic of the gs1575a/9075a includes a system which monitors the frequency acquisition loop and the phase acquisition loop as well as a monitor to detect harmonic lock. the los (loss of signal) output is an ac tive high output which indicates the absence of data transitions at the ddix inpu t. in order for this output to be asserted, transitions must not be present for a period of typically 5.14 us. after this output has been asserted, los will deassert typically 5.14 us after the appearance of a transition at the ddix input. this timing relationship is shown in figure 4-4 : figure 4-4: los signal timing note: los is sensitive to transitions appearing at the input, and does not distinguish between transitions caused by input data, and transitions due to noise. 4.11 output drivers and serial clock outputs the device?s serial digital data outputs (ddo/ddo ) have a nominal voltage of 800mv single ended or 1600mv differential when terminated into a 50 load . the gs1575a/9075a may also be configured to output a serial clock at the data output rate. the internal serial clock ou tput block is powered via the sco_enable pin. when sco_enable is conn ected to vcc, a di fferential serial clock output will be present on sco/sco . otherwise, when sco_enable is connected to gnd, the clock output block will be powered down and the device will have reduced power consumption. note: the sco_enable signal should hav e a 1.5ma drive strength to maintain a supply voltage of 3.3 +/- 0.165v. clock and data alignment is shown in figure 4-5 . data los 5.14 us 5.14 us
gs1575a / GS9075A data sheet 34716 - 0 december 2005 23 of 29 figure 4-5: clock and data alignment 4.12 output mute the ddo_mute pin is provided to allow muting of the re-timed output. when the pll is locked and the device is reclocking, setting ddo_mute = low will force the serial digital outputs ddo/ddo to mute. however, if the gs1575a/9075a is in bypass mode , (autobypass = high and/or bypass = high), ddo_mute will have no effect on the output. data sclk t cd for hd-sdi: t cd = 32ps (typ.), 36ps (max.) for sd-sdi: t cd = 30ps (typ.), 38ps (max.)
gs1575a / GS9075A data sheet 34716 - 0 december 2005 24 of 29 5. typical application circuits figure 5-1: gs1575a typical application circuit asi_177 ddi_sel1 sdo_mute ddi_sel0 locked sd/hd 3.3v 3.3v 3.3v 3.3v 10n 10n 10n 10n 47n gs1575a 1 2 3 4 5 6 7 8 9 10 11 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 51 52 53 54 55 56 57 58 59 60 61 62 63 64 ddi0 ddi0_vt ddi0 gnd ddi1 ddi1_vt ddi1 gnd ddi2 ddi2_vt ddi2 gnd ddi3 ddi3_vt ddi3 gnd ddi_sel0 ddi_sel1 bypass autobypass auto/man vcc_vco vee_vc0 ss0 ss1 ss2 asi/177 locked los vcc_dig vee_dig gnd sd/hd kbb sco_enable ddo_mute gnd nc sco vcc_sco vee_sco gnd ddo nc ddo vcc_ddo vee_ddo gnd xtal_out+ xtal_out- xtal+ xtal- nc vee_cp vcc_cp lf- lf+ gnd 10n (14.140mhz) 10n 10n 10n data input 1 data input 0 data input 3 data input 2 data output zo = 50 zo = 50 zo = 50 zo = 50 zo = 50 3.3v 10n 100 go1535 note: all resistors in ohms and all capacitors in farads. nc nc nc nc nc sco clock output zo = 50 los
gs1575a / GS9075A data sheet 34716 - 0 december 2005 25 of 29 figure 5-2: GS9075A typical application circuit asi_177 ddi_sel1 sdo_mute ddi_sel0 locked sd 3.3v 3.3v 3.3v 3.3v 10n 10n 10n 10n 47n GS9075A 1 2 3 4 5 6 7 8 9 10 11 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 51 52 53 54 55 56 57 58 59 60 61 62 63 64 ddi0 ddi0_vt ddi0 gnd ddi1 ddi1_vt ddi1 gnd ddi2 ddi2_vt ddi2 gnd ddi3 ddi3_vt ddi3 gnd ddi_sel0 ddi_sel1 bypass autobypass auto/man vcc_vco vee_vc0 ss0 ss1 ss2 asi/177 locked los vcc_dig vee_dig gnd sd kbb sco_enable ddo_mute gnd nc sco vcc_sco vee_sco gnd ddo nc ddo vcc_ddo vee_ddo gnd xtal_out+ xtal_out- xtal+ xtal- nc vee_cp vcc_cp lf- lf+ gnd 10n (14.140mhz) 10n 10n 10n data input 1 data input 0 data input 3 data input 2 data output zo = 50 zo = 50 zo = 50 zo = 50 zo = 50 3.3v 10n 100 go1535 note: all resistors in ohms and all capacitors in farads. nc nc nc nc nc sco clock output zo = 50 los
gs1575a / GS9075A data sheet 34716 - 0 december 2005 26 of 29 6. package & ordering information 6.1 package dimensions a b 9 . 00 4 . 50 4 . 50 9 . 00 2x 2x 0 .1 5 c 0 .1 5 c 0 .1 0 c 0 . 08 c 6 4 x s eatin g plan e 0 . 90 + / - 0 .1 0 +0 . 03 0 . 0 2- 0 . 02 0 .2 0 re f c 7 .1 0 + / - 0 .1 5 3 . 55 0 .4 0 + / - 0 . 05 0 . 95 + / - 0 . 05 7 .1 0 + / - 0 .1 5 3 . 55 +0 . 03 0 .2 5 - 0 . 02 6 4 x 0 .1 0 c a b c 0 . 05 0 . 50 a ll dimen s i o n s in m m pin 1 area centre tab 4 . 50 0 . 35 45 4 ?
gs1575a / GS9075A data sheet 34716 - 0 december 2005 27 of 29 6.2 recommended pcb footprint the center pad of the pcb footprint should be connected to the ground plane by a minimum of 36 vias. note: suggested dimensions only. final dimensions should conform to customer design rules and process optimizations. note: all dimensions are in millimeters. 7.10 7.10 8.70 8.70 0.50 0.25 0.55 center pad
gs1575a / GS9075A data sheet 34716 - 0 december 2005 28 of 29 6.3 packaging data 6.4 ordering information parameter value package type 9mm x 9mm 64-pin qfn moisture sensitivity level 3 junction to case thermal resistance, j-c 9.1c/w junction to air thermal resistance, j-a (at zero airflow) 21.5c/w psi, 0.2c/w pb-free and rohs compliant yes part number package temperature range gs1575a gs1575acne3 pb-free 64-pin qfn 0c to 70c GS9075A GS9075Acne3 pb-free 64-pin qfn 0c to 70c
caution electrostatic sensitive devices do not open packages or handle except at a static-free workstation gennum corporation mailing address: p.o. box 489, stn. a, burlington, ontario, canada l7r 3y3 shipping address: 970 fraser drive, burlington, ontario, canada l7l 5p5 tel. +1 (905) 632-2996 fax. +1 (905) 632-5946 gennum japan corporation shinjuku green tower building 27f, 6-14-1, nish i shinjuku, shinjuku-ku, tokyo, 160-0023 japan tel. +81 (03) 3349-5501, fax. +81 (03) 3349-5505 gennum uk limited 25 long garden walk, farnham, surrey, england gu9 7hx tel. +44 (0)1252 747 000 fax +44 (0)1252 726 523 gennum corporation assumes no liability for any errors or omissions in this document, or for the use of the circuits or devices described herein. the sale of the circuit or device described herein does not imply any patent license, and gennum makes no representation that the circuit or device is free from patent infringement. gennum and the g logo are registered trademarks of gennum corporation. ? copyright 2005 gennum corporation. all rights reserved. printed in canada. www.gennum.com gs1575a / GS9075A data sheet 34716 - 0 december 2005 29 29 of 29 document identification data sheet the product is in production. ge nnum reserves the right to make changes to the product at any time wit hout notice to improve reliability, function or design, in order to provide the best product possible. 7. revision history version ecr pcn date changes and/or modifications a 136456 ? april 2005 new document. 0 137416 ? december 2005 converted to data sheet. added block diagram, pinout, dc and ac electrical, and circuit information for serial clock output support. added information on GS9075A. added los support information. corrected minor typing errors. corrected maximum serial digital output swing to 2200 mv. corrected packaging diagram.

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