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m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support M21528-13 1 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 applications ? 3g/hd/sd video switchers ? 3g/hd/sd video routers ? 3g/hd/sd distribution amplifiers ? dvb-asi equipment ? smpte 259c/d, 292m, 424m, dvb asi 270mb/s features ? dual channel cable driver ? two pairs of non-inverting, smpte compliant outputs ? typical output jitter of 12 ps peak?to?peak at 2.97 gbps ? exceptional output return loss with no matching network ? very low power design; 40 mw/channel @1.8v ? selectable slew rate for sd and 3g/hd operation the m21528 is a very low power, highly integrated, dual cable driver for smpte compliant digital video applications. it can dri ve 2 pairs of 75 ? coaxial cables, or 50 ? equivalent loads, at sdi data rates from 270 mbps to 2.97 gbps. the device is capable of outputting sdi signals with typical jitter values of 12 ps peak?to?peak , when operating at 2.97 gbps. the dual cable driver includes a 2x2 input crosspoint and integrated input and output termination resistors. the m21528, with i nput equalization for up to 36" of fr4 trace in addition to two connectors and exceptional output return loss (orl), is ideal for hi gh speed, 3g-sdi, designs. the device features integrated supply regulators, allowing it to be powered from 1.8v, 2.5v, or 3.3v supply voltages. when oper ating at 1.8v, it consumes only 40 mw per channel at 2.97 gbps. furthermore, the power rails for the input and output circuitry are elec trically isolated on-chip and as such may be connected to different voltage rails on the board. this feature enables the m21528 to be dc cou- pled to any upstream device in the 1.2v to 3.3v range. the integrated 2x2 crosspoint allows for either input to be routed to either output, eliminating the need for an external multi plexer. addi- tionally, one input may be routed to both outputs. the cable driver also provides cable detect and loss of signal (los) functio nality. it can be configured to automatically power down at cable disconnect or loss of input signal. the m21528 is offered in a green and rohs compliant 24 pin qfn package. m21528 block diagram sdi0p sdi1p sdi1n los los ie ie sdi0n 75 ? /50 ? sdo0a sdo0b sdo1b sdo1a 2 x 2 crosspoint 75 ? /50 ? 75 ? /50 ? 75 ? /50 ? ? input equalization for up to 36" of fr4 + 2 connectors ? integrated, selectable 75 ? or 50 ? output termination ? integrated 50 ? input termination ? integrated 2x2 crosspoint switch with broadcast mode ? on-chip regulators for operation from 1.8v to 3.3v dc supply ? universal dc coupling at the input, from 1.2v to 3.3v ? cable detect with automatic power down and power up upon cable disconnect and re-connect ? loss of input signal detection ? independent channel mute and power down ? industrial operating temperature range: -40c to 85c ? 4 kv hbm and 500v cdm esd rating ? 4 mm x 4 mm 24 pin qfn package ? green and rohs compliant
ordering information part number package operating temperature m21528g-13 4 mm x 4 mm 24-pin qfn (rohs compliant) ?40 c to 85 c * the letter ?g? designator after the part number indicates that the device is rohs compliant. the rohs compliant devices are b a ckwards compatible with 225 c reflow profiles. revision history revision level date description v4 release december 2015 added footnotes to figure 3-7 . v3 release may 2015 revised z_ctrl resistor value for 75 : output impedance in table 3-1 . revised section 4.3 . updated marking diagram. updated figure 3-7 with new package diagram. e (v2) release march 2010 corrected figure 3-7 center pad dimensions. revised table 1-5 ; drin min, jao 3g, hd max. d (v1) release december 2009 added marking diagram. added eye diagams in section 2.0 . revised typical and maximum values in table 1-3 . revised table 1-4 . revised figure 3-2 and figure 3-3 . c (v1p) preliminary may 2009 added note 5 to table 1-5 . removed note 2 from table 3-1 (2-state/i-digital inputs have an internal 100k : resistor to av dd i). revised figure 4-3 , figure 4-4 , figure 4-5 . added input/output circuits in section 3.0 . b (v2a) advance february 2009 major revisions th ro ughout document. a (v1a) advance june 2008 initial release. m21528 marking diagram par t num ber lot num ber date countr y of origin xxxx .x yywwco 52813 M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 2 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4
m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support M21528-13 3 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 table of contents ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.0 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.0 typical performance characteri stics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.0 pinout diagram, pin description, and package drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.0 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 4.2 input description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 4.3 output description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 4.4 power supply description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 4.5 logic control signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 4.5.1 slew rate control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.5.2 crosspoint control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.5.3 powerdown mode control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.6 cable detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support M21528-13 4 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 1.0 electrical characteristics unless noted otherwise, specificat ions apply for typical recommended operating conditions shown in ta b l e 1-2 , with a v dd o = 1.8v, av dd i = 1.2v, cml inputs at 80 0 mv differential (rl = 50 : ), prbs 2 15 ? 1 test pattern at 2.97 gbps. table 1-1. absolute maximum ratings symbol parameter note minimum typical maximum unit av dd i analog supply for input circuitry 1 -0.5 ? 3.6 v av dd o0/1 analog supply for output circuitry 1 -0.5 ? 3.6 v t st storage temperature 1 -65 ? 150 oc esd human body model (hbm) 1 -4 ? 4 kv esd charge device model (cdm) 1 -500 ? 500 v lu latch up @ 85oc 1 -200 ? 200 ma hsic maximum high-speed input current 1 -100 ? 100 ma hsoc maximum high-speed output short circuit current 1 -100 ? 100 ma v inmax input voltage range 1 -0.5 ? av dd i+0.5 v notes: 1. exposure to these conditions over extended periods of time may affect device reliability table 1-2. recommended operating conditions symbol parameter note minimum typical maximum unit av dd i analog supply for input circuitry ? 1.14 1.2, 1.8, 2. 5, or 3.3 3.465 v av dd o0/1 analog supply for output circuitry ? 1.71 1.8, 2.5, or 3.3 3.465 v t case operating temperature 1 -40 25 +85 o c esd human body model (hbm) ? -4 ? 4 kv notes: 1. case temperature.
table 1-3. power consumption specifications symbol parameter conditions note minimum typical maximum unit p diss total power consumption av dd i = 1.2v av dd o = 1.8v both channels active, 4 outputs on 1 ? 78 122 mw av dd i = 1.2v av dd o = 1.8v both channels active, one output per channel on 1 ? 61 95 mw av dd i = 1.2v av dd o = 1.8v one channel active, one output on 1 ? 49 86 mw i_ av dd i total av dd i supply current av dd i = 1.2v 1 ? 1 3.0 ma i_ av dd i total av dd i supply current av dd i = 1.8v 1 ? 3 7.0 ma i_ av dd i total av dd i supply current av dd i = 3.3v 1 ? 10 17.0 ma i_ av dd o total av dd o supply current both channels active 1,2 ? 43 68.0 ma i_ av dd o total av dd o supply current only channel 0 active 1,2 ? 43 68.0 ma i_ av dd o0 total av dd o0 supply current only channel 1 active 1,2 ? 27 49.0 ma ja junction to ambient thermal resistance 3 ? 63 ? o c/w notes: 1. recommended operating condition?see table 1-2 . 2. current consumption does not change with av dd o = 1.8v, 2.5v or 3.3v. 3. airflow = 0 m/s. table 1-4. digital input specifications symbol parameter note minimum typical maximum unit v ih input logic high ? 0.85 x av dd i ? av dd i + 0.5 v v if input logic floating state ? 0.25 x av dd i ? 0.75 x av dd i v v il input logic low ? 0 ? 0.15 x av dd i v i ih input current?logic high ? -100 ? 100 p a i il input current?logic low ? -100 ? 100 p a M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 5 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4
table 1-5. high speed input/output electrical specifications symbol parameter note minimum typical maximum unit v o output voltage range 1 730 800 850 mv t r /t f sd rise/fall time (20?80%) 1,3,4 400 600 800 ps t r /t f 3g/hd rise/fall time (20?80%) 1 ? 70 90 ps t r -t f sd rise/fall time mismatch 1,3,4 ? ? 125 ps t r -t f 3g/hd rise/fall time mismatch 1,3 ? ? 30 ps dcd duty cycle distortion, sd 1,4 ? ? 100 ps dcd duty cycle distortion, 3g, hd 1,3 ? ? 30 ps jao pp additive output jitter, sd 1,2,4 ? 60 100 ps jao pp additive output jitter, 3g, hd 1,2 ? 12 29 ps s 22 output return loss (5 mhz to 1.5 ghz) 6,8 20 ? ? db s 22 output return loss (5 mhz to 3.0 ghz) 5,8 11 ? ? db s 22 output return loss (5 mhz to 3.0 ghz) 6,8 14 ? ? db dr in input data rate ? 270 ? 2970 mbps v id differential input voltage (p?p) 7 400 ? 1600 mv v ic input common mode range ? av dd i ? 0.6 ? av dd i + 0.1 v ie input equalizer gain off (en_eq = 0) ? ? 0 ? db input equalizer gain med (en_eq = f) ? ? 4 ? db input equalizer gain high (en_eq = h) ? ? 6 ? db r int input termination to av dd i ? 40 50 60 ? 1. measured ac coupled into 1m coaxial cable, terminated with appropriate 75 ? or 50 ? load. 2. measured with prbs 2 15 -1 test pattern. 3. for data rates above 360 mb/s, the cable driver must be in hd mode (sd/xhd = 0). 4. sd/xhd = 1, measured at 270 mb/s. 5. without external matching network. 6. with external matching network r matching =75 ? , l matching =1nh, only applicable to 75 ? mode. 7. eq_en = l (input equalization off) pd_mode = f (los enabled), point blank. 8. as measured on macom evm at bnc connector with output impedance set to 75 ? . M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 6 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4
m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support M21528-13 7 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 2.0 typical performance characteristics figure 2-1. eye diagram at 270 mbps figure 2-2. eye diagram at 1485 mbps figure 2-3. eye diagram at 2970 mbps
m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support M21528-13 8 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 3.0 pinout diagram, pin description, and package drawing figure 3-1. pinout diagram (top view) m21528 4mmx4mm qfn sd/xhd0 24 pd0 23 z_ctrl 22 xpt_ctrl 21 av dd reg0 20 sdo0a 19 sdo0b 18 av dd reg0 17 av dd o0 16 av dd o1 15 av dd reg1 14 sdo1b 13 sd/xhd1 7 pd1 8 av dd i9 pd_mode 10 av dd reg1 11 sdo1a 12 sdi0p 1 sdi0n 2 en_eq0 3 en_eq1 4 sdi1p 5 sdi1n 6
M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 9 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 table 3-1. pin description (1 of 2) pin name pin number type description av ss center ground paddle power chip ground av dd i 9 power positive supply for inputs circuitry av dd reg0 17,20 power regulator0 bypass capacitor connection, positive supply for output0 av dd reg1 11,14 power regulator1 bypass capacitor connection, positive supply for output1 av dd o0 16 power positive supply for reglator0 av dd o1 15 power positive supply for reglator1 sdo0a 19 o-analog high speed serial output, channel0, output a sdo0b 18 o-analog high speed serial output, channel0, output b sdo1a 12 o-analog high speed serial output, channel1, output a sdo1b 13 o-analog high speed serial output, channel1 output b sdi0p/n 1,2 i-analog high speed serial video data input, channel0 sdi1p/n 5,6 i-analog high speed serial video data input, channel1 z_ctrl 22 i-analog sets output impedance through an external z_ctrl resistor connected to av ss z_ctrl=665 ? to set 75 ? output impedance ? z_ctrl=250 ? to set 50 ? output impedance sd/xhd0 24 i-digital output slew rate control for channel 0 l = sdo0 has 3g/hd slew rate ? h = sdo0 has sd slew rate sd/xhd1 7 i-digital output slew rate control for channel 1 l = sdo1 has 3g/hd slew rate ? h = sdo1 has sd slew rate pd0 23 3-state/i-digital power down control for channel 0 l = sdo0a on, sdo0b power down ? f = both outputs on ? h = power down both outputs pd1 8 3-state/i-digital power down control for channel 1 l = sdo1a on, sdo1b power down ? f = both outputs on ? h = power down both outputs xpt_ctrl 21 3-state/i-digital crosspoint control l = sdi0 to sdo1, sdi1 to sdo0 ? f = sdi0 to sdo0, sdi1 to sdo1 ? h = sdi0 to sdo0 and sdo1
M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 10 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 pd_mode 10 3-state/i-digital power down and cable detect control l = cable detect disabled, pd upon los disabled ? f = cable detect enabled, pd upon los enabled ? h = cable detect enabled, pd upon los disabled en_eq0 3 3-state/i-digital input equalization control for channel 0 l = no input equalization on sdi0p/n ? f = medium input equalization on sdi0p/n ? h = high input equalization on sdi0p/n en_eq1 4 3-state/i-digital input equalization control for channel 1 l = no input equalization on sdi1p/n ? f = medium input equalization on sdi1p/n ? h = high input equalization on sdi1p/n notes: 1. 3-state inputs have a default of f (floating). 2. a z_ctrl resistance of 665 ? will also provide 80 0mvpp output swing. figure 3-2. differential input (sdip, sdin) sdip av dd i av ss sdin av dd i av ss 50? 50? input buffer with trace equalizer table 3-1. pin description (2 of 2) pin name pin number type description
figure 3-3. single-ended output (sdo 0a, sdo0b, sdo1a, sdo1b) 50? ? ? M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 11 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4
figure 3-5. state logic input (pd0, pd1, xpt _ctrl, pd_mode, en_eq0, en_eq1) av ss av dd i av ss av dd i input av dd i av ss vref_low vref_high 2.0k ? M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 12 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 the m21528 is assembled in 24 pin 4 mm x 4 mm quad flat no-lead (qfn) package. the exposed die paddle serves as the ic ground (av ss ), and the primary means of thermal dissipation. this die paddle should be soldered to the pcb ground. a cross-section of the qfn package can be found in figure 3-6 . figure 3-6. qfn package cross section mold compound gold wire die attach material exposed die paddle ground bond down bond cu leadframe solder plating ag plating die
figure 3-7. package drawing 1. for dimension reference a, min. is 0.800, nom. is 0.850 and max. is 0.900. 2. new unisem package and old amkor package have the same footprint dimensions. M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 13 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4
m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support M21528-13 14 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 4.0 functional description 4.1 block diagram figure 4-1 is the functional block diagram of the m21528. the subse quent sections provide additional detail on the operation of the device. figure 4-1. m21528 functional block diagram sdi 0p sdi0 n los sdi 1p sdi1 n 2 x 2 xpoint input buff & fr4 eq av dd i regulator control logic cable detect z control sdo 0a sdo 0b sdo 1a sdo 1b z_ c t rl r r r r pd1 pd0 sd/xhd1 sd/xhd0 pd_mode xpt_ ctrl av dd reg0 av dd reg1 av dd reg0 av dd reg1 av dd o1 av dd o0 en_e q0 en_e q1
M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 15 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 4.2 input description the m21528 has differential inputs, with integrated 50 ? pull ups to av dd i. av dd i may be supplied from a 1.2v, 1.8v, 2.5v, or 3.3v supply. the input buffers are compatible with pcml, lvds or lvpecl signal levels. to improve signal integrity in large s ystems, all inputs have programmable input equalization (ie) with three gain levels: 0 db, 4 db, 6 db. setting the gain to 0db effectively disables the ie featur e. the pins en_eq0 and en_eq1 allow for the selecting the proper level of input equalization based on the bo ard characteristics for each input. the maximum level of equalization compensates for up to 36? of fr4 trace. the operation of the en_eq0 /1 pin is summarized in ta b l e 4-1 below. table 4-1. operation of eq_en0 and eq_en1 pins pin level function en_eq0 l sdi0p/n ie eq gain = 0 db f sdi0p/n ie eq gain = 4 db h sdi0p/n ie eq gain = 6 db en_eq1 l sdi1p/n ie eq gain = 0 db f sdi1p/n ie eq gain = 4 db h sdi1p/n ie eq gain = 6 db in 3g/hd/sd sdi applications, it is best to avoid ac coupling data interfaces between devices, if possible. dc coupling will result in increased system jitter margin. also, dc coupling eliminates the requirement for additional components on the board. in order to accommodate dc coupling to the upstream device, the av dd i domain of the m21528 is electrically isolated from all other power do mains on chip. this allows for it to be tied to the v dd of the previous device?s driver enabling a fully dc coupled system, as shown below. upstream m21528 av dd i 1.2v ? 3.3v v dd 50? 50 ?
M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 16 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 alternatively, a ?self-biasing? scheme can be used at the input. this offers the benefit of having the v dd of the previous device and the power domain(s) of the m21528 completely separated, while allowing dc coupling: 0.1uf previous device m21528 av dd i v dd 50 ? 50 ? in this configuration, the minimum input co mmon mode that can be tolerated, is 1.2v. if, for any reason, ac coupling is necessar y, then a capacitor of 4.7 f or greater must be used. a loss of signal (los) detector circuit monitors each input an d issues an internal alarm when the input signal goes below the detection threshold. the detec tion threshold is 90 mvpp with +90 mv hysteresis. this means that if the input signal level drops below 90 mvpp, then the internal los alarm is asserted. for the alarm to be de-asserted, the input signal must increase to greater than 180 mvpp; the hysteresis prevents the internal los alarm from chattering. depending on the state of the pd_mode pin, the los alarm at a p articular input can power down the associated signal path and forces the corresponding output to low level. 4.3 output description the m21528 contains two independent si gnal channels, each with two positive polarity cable driver outputs. unlike conventional smpte compliant cable drivers, the m21528 uses a voltage mode implementation as opposed to current mode. this allows for significant power savings when compared to previous generation cable drivers with the added benefit of two positive polarity outputs per channel. internally an output buffer drives a 1.6v amplitude signa l th rough an integrated impedance load. the impedance of the load is set by the external z_ctrl resistor to av ss . for most applications z_ctrl should be 665 ? , which set s the output load to 75 ? and provides 800mvpp output swi ng. if the application requires a 50 ? output imp edance, z_ctrl may be 250 ? . in both cases z_ctrl must have 1% tolerance. the m21528 can meet smpte orl specification s without the need for an ex ternal matching network. however, for additional margin a matching network consisting of a 75 ? resistor and a 1 nh inductor may be used. each channel has a dedicated power down pin, pd0 and pd1. the operation of the pd pin is summarized in ta b l e 4-2 below. when powered down, the signal at the output is set to low.
table 4-2. operation of pd0 and pd1 pins pin level function pd0 l sdo0a on, sdo0b powered down f both sdo0a and sdo0b on h both sdo0a and sdo0b powered down pd1 l sdo1a on, sdo1b powered down f both sdo1a and sdo1b on h both sdo1a and sdo1b powered down M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 17 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 figure 4-2 shows a typical output circuit. when the cable detect function is enabled, only the outputs used need to be connected, unused outputs may be le ft floating. however, if the cable detection function is disabled, unused outputs must be powered down or properly terminated. figure 4-2. typical output circuit (all outputs connected) m21528 circuit a sdo0a sdo0b circuit a sdo1a circuit a sdo1b circuit a 4.7 f
M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 18 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 4.4 power supply description the device features two internal regulators to suppl y the power for the output drivers for each channel. av dd o0 and av dd o1 supply the voltage to each channel?s respective regulator. these pins may be connected to dc voltages ranging from 1.8v to 3.3v. each regulator requires an external 1f bypass capacitor to ground, which must be connected to av dd reg0 and av dd reg1. it is recommended to add a secondary 10 nf bypass capacitor on each regulator output as close to the pin as possible. in addition to supplying the output stage for channel1, av dd o1 is also used to power the core circuitry for both channels. a completely separate supply domain, a v dd i, provides the supply for the high-speed serial input pins. the input termination and esd protection for the sdi pins and the digi tal control input pins are referenced to this supply. the isolated domain allows dc coupling to an upstream devi ce that is running from a different supply voltage. for example, if, in order to save power, av dd o0/1 are connected to 1.8v, but the cable driver must interface to a reclocker that uses a 3.3v su pply, then dc coupling can be achieved by simply connecting av dd i to the 3.3v rail. figure 4-3 to 4-5 show three examples of how the cable driver ca n be co nfigured. note that even when only one channel is enabled, both output regulators must be supplied with the correct voltage. figure 4-3. supply configuration, both channels and both a and b outputs used 1.2v to 3.3v 1.8v to 3.3v 0.1uf av dd reg0 av dd o0 av dd o1 av dd reg1 pd1 pd0 av dd i 1 f 1 f 10 nf 10 nf
figure 4-4. supply configuration, channel0, out put s a and b used, channel 1 powered down 1.2v to 3.3v 1.8v to 3.3v 0.1uf av dd reg0 av dd o0 av dd reg1 pd1 pd0 av dd i 1 M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 19 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4
M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 20 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 4.5 logic control signals the digital logic control signals are esd protected and referenced to the av dd i. this allows the device to interface to many different logic levels from different supply domains. some pins have a state called ?f?; this stands for ?floa ting?. to assert this state leave the pin unconnected. 4.5.1 slew rate control pins sd/xhd0 and sd/xhd1 control the slew rate of the associated channel outputs. to comply with the smpte sd specification the slew rate is slowed down to approximately 600 ps when in sd mode. note that there is no pull- up on the sd/xhd pins, so it should not be left floating. table 4-3. operation of sd/xhd0 and sd/xhd1 pins pin level function sd/xhd0 l set sdo0a/b slew rate to 3g/hd levels h set sdo0a/b slew rate to sd levels sd/xhd1 l set sdo1a/b slew rate to 3g/hd levels h set sdo1a/b slew rate to sd levels 4.5.2 crosspoint control the xpt_ctrl pin controls the 2 x 2 crosspoint at the input. it can be used to redirect the input signal to the other output or from channel 0 to make broadcast mode, so the input on channel 0 appears on both channel 0 and 1 outputs. this last mode is useful in distribution amplifiers where one input can drive fours positive outputs. the crossover feature can be used in routers to select a second input bank. the functionality of the xpt_ctrl pin is summarized in the table below. table 4-4. operation of xpt_ctrl pin pin level function xpt_ctrl l crossover mode: sdi0 routed to sdo1 ? sdi1 routed to sdo0 f default mode: sdi0 routed to sdo0 ? sdi1 routed to sdo1 h broadcast mode: sdi0 routed to sdo0 and sdo1
M21528-13 m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support 21 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4 4.5.3 powerdown mode control the m21528 has integrated output cable detection and input los detection circuitry. depending on the setting of the pd_mode pin, the device can automatically power down each channel when output cables are disconnected or there is no signal present at the input. the functionality of the pd_mode pi n is summarized in the table below. table 4-5. operation of pd_mode pin level function pd_mode l cable detection disabled power down on los disabled f cable detection enabled power down on los enabled h cable detection enabled power down on los disabled 4.6 cable detection the m21528 features an integrated near-end cable detecto r. this circuit can detect whether a cable has been disconnected from an output and whether or not it is reconnected without requiring any additional external components. utilizing the cable detection feature has s everal system level advantages such as: ? reduced power consumption when no cable is connected to both outputs of a single channel ? reduced emi ? eliminate the requirement for external termination depending on the state of the pd_mode pin, when both ou tput a and b of either channel are disconnected, the device can automatically power down the channel resulting in a 75% power reduction for that channel. furthermore, if output b is manually powered down (pd = l) , then disconnecting output a will result in completely powering down the channel (both outputs). due to the detection mechanism, the signal at each output within a channel will experience a phase step of approximately 15 ps when the other output?s state is changed: po wer ed down, powered up, disconnected, or re- connected. if one output is disconnected but the other remains connec ted, and both outputs are to ggling, the signal at the connected output may experience up to 10% ov ershoot for a period of approximately 500 ns. the overshoot is ca used by the reflections coupled from the un connected output to the connected one. 500 ns is the duration re quired by the circuit to detect the disconnection. if c able detection is disabled an d the output is not properly terminated, the overshoot will persist. therefor e, it is strongly recommended to enable cable detection, or terminate both outputs properly; when both outputs of one channel are turned on. the cable detection function may be disabled by setting pd_mode=l.
m/a-com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: http://www.macom.com/support m/a-com technology solutions inc. all rights reserved. information in this document is provided in connect ion with m/a-com technology solutions inc ("macom") products. these materials are provided by macom as a service to its customers and may be used for informational purposes only. except as provided in macom ' s terms and conditions of sale for such products or in any separate agreement related to this document, macom assumes no liability whatsoever. macom assumes no responsibility for errors or omissi ons in these materials. macom may make changes to specifications and product descriptions at any time, without notice. ma com makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incompatibilities ar ising from future changes to its specifications and product descriptions. no license, ex press or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. these materials are provided "as is" without warranty of any kind, either express or implied, relating to sale and/or use of macom products incl uding liability or warranties relating to fitness for a particul ar purpose, consequential or incidental damages, merchantability, or infringeme nt of any patent, copyright or other intellectual property right. macom further does not warrant the accuracy or completeness of the information, text, graph ics or other items contained within these materials. macom shall not be liable for any special, indirect, incidental, or consequential damages, including without li mitation, lost revenues or lost profits, which may result from the use of these materials. macom products are not intended for use in medical, lifes aving or life sustaining applications. macom customers using or selling macom products for use in such applications do so at their own risk and agree to fully indemnify macom for any damages resulting from such improper use or sale. M21528-13 22 dual 3g/hd/sd-sdi multi- rate video cable driver rev v4

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