fms6143 rev. 3a 1 www.fairchildsemi.com ?005 fairchild semiconductor corporation f ebruary 2005 fms6143 low cost three channel 4th order standard de?ition video filter driver fms6143 low cost three channel 4th order standard de?ition video filter driver features three fourth-order 8mhz (sd) ?ters tr ansparent input clamping dual video load drive (2vpp, 75 ? ) ac or dc-coupled inputs ac or dc-coupled outputs dc-coupled outputs eliminate ac-coupling capacitors 5v only robust 8kv esd protection lead (pb) free soic-8 package applications cable set top boxes satellite set top boxes d vd players hdtv p ersonal video recorders (pvr) video on demand (vod) description the fms6143 low cost video filter (lcvf) is intended to replace passive lc ?ters and drivers with a low-cost integrated device. three 4th order ?ters provide improved image quality compared to typical 2nd or 3rd order passive solutions. the fms6143 may be directly driven by a dc-coupled dac out- put or an ac-coupled signal. internal diode clamps and bias cir- cuitry may be used if ac-coupled inputs are required (see applications section for details). the outputs can drive ac or dc-coupled single (150 ? ) or dual (75 ? ) loads. dc-coupling the outputs removes the need for out- put coupling capacitors. the input dc levels will be offset approximately +280mv at the output (see applications section f or details). functional block diagram in1 in2 in3 out1 out2 out3 8mhz, 4 th order 6d b tr ansparent clamp 6d b tr ansparent clamp 6d b tr ansparent clamp
www.fairchildsemi.com 2 fms6143 rev. 3a fms6143 low cost three channel 4th order standard de?ition video filter driver pin con?urations pin assignments reliability information absolute maximum ratings recommemded operating conditions pin# pin type description 1 in1 input video input, channel 1 2 in2 input video input, channel 2 3 in3 input video input, channel 3 4v cc input +5v supply, do not ?at 5 gnd output must be tied to ground, do not ?at 6 out3 output filtered output, channel 3 7 out2 output filtered output, channel 2 8 out1 output filtered output, channel 1 p arameter min. typ. max. unit j unction temperature 150 ? storage temperature range -65 150 ? lead temperature (soldering, 10s) 300 ? thermal resistance ( ja ), jedec standard multi-layer test boards, still air 115 ?/w esd (human body model) 8 kv p arameter min. max. unit dc supply voltage -0.3 6 v analog and digital i/o -0.3 v cc +0.3 v output current any one channel, do not exceed 50 ma p arameter min. typ. max. unit operating temperature range 0 70 c v cc range 4.75 5.0 5.25 v fms6143 8-pin soic in1 out1 in2 in3 out3 v cc out2 gnd 1 2 3 4 8 7 6 5
fms6143 rev.3a 3 www.fairchildsemi.com fms6143 low cost three channel 4th order standard de?ition video filter driver dc electrical characteristics operating conditions: (t c = 25?, v cc = 5.0v, r source = 37.5 ? , all inputs ac coupled with 0.1 f, all out- puts ac coupled with 220 f into 150 ? loads; unless otherwise noted) ac electrical characteristics operating conditions: (t c = 25?, v in = 1v pp , v cc = 5.0v, r source = 37.5 ? , all inputs ac coupled with 0.1 f, all outputs ac coupled with 220 f into 150 ? loads; unless otherwise noted) notes: 1. 100% tested at 25? symbol parameter conditions min. typ. max units i cc supply current 1 fms6143 no load 19 27 ma v in video input voltage range referenced to gnd if dc-coupled 1.4 v pp psrr power supply rejection ratio dc (all channels) -50 db symbol parameter conditions min. typ. max units av channel gain 1 all channels 5.6 6.0 6.6 db f 1db -1db bandwidth 1 all channels 4.5 6.5 mhz f c -3db bandwidth all channels 7.7 mhz f sb attenuation (stopband reject) all channels at f = 27mhz 48 db dg differential gain all channels 0.3 % d differential phase all channels 0.6 thd output distortion (all channels) v out = 1.8v pp , 1mhz 0.4 % x t alk crosstalk (channel-to-channel) at 1mhz -60 db snr signal-to-noise ratio all channels, ntc-7 weighting: 100khz to 4.2mhz 75 db t pd propagation delay delay from input-to-output, 4.5mhz 59 ns
www.fairchildsemi.com 4 fms6143 rev. 3a fms6143 low cost three channel 4th order standard de?ition video filter driver t ypical performance characteristics operating conditions: (t c = 25?, v cc = 5.0v, r source = 37.5 ? , all inputs ac coupled with 0.1 f, all out- puts ac coupled with 220 f into 150 ? loads; unless otherwise noted) figure 1. frequency response figure 2. group delay vs. frequency figure 3. noise vs. frequency figure 4. differential gain figure 5. differential phase 1 = 8.2mhz (12.63ns) 1 delay (ns) 400khz 5 10 15 25 20 30 fr equency (mhz) -60 -40 -50 -30 -20 -10 0 30 10 20 3 2 10 gain (db) 400khz 5 10 15 25 20 30 f requency (mhz) 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 1 mkr frequency gain ref 400khz 6db 1 6.53mhz -1db bw 2 7.72mhz -3db bw 3 27mhz -41.13db f sbsd = gain (ref) ? gain (3) = 47.13db -0.3 -0.2 0.2 differential gain (%) 1st 2nd 3rd 5th 4th 6th 0.1 -0.1 0 -60 noise (db) 400khz 1 2 3 5 46 f requency (mhz) -70 -80 -90 -100 -110 -120 -130 ntsc min = -0.20 max = 0.13 ppmax = 0.33 -0.4 -0.2 0 0.2 1.0 differential phase (deg) 1st 2nd 3rd 5th 4th 6th 0.8 0.4 0.6 ntsc min = 0.00 max = 0.59 ppmax = 0.59
fms6143 rev. 3a 5 www.fairchildsemi.com fms6143 low cost three channel 4th order standard de?ition video filter driver applications information application circuits the fms6143 low cost video filter (lcvf) provides 6db gain from input to output. in addition, the input will be slightly offset to optimize the output driver performance. the offset is held to the minimum required value to decrease the standing dc current into the load. typical voltage levels are shown in the diagram below: figure 6. typical voltage levels the fms6143 provides an internal diode clamp to support ac- coupled input signals. if the input signal does not go below g round, the input clamp will not operate. this allows dac out- puts to directly drive the fms6143 without an ac coupling capacitor. when the input is ac-coupled, the diode clamp will set the sync tip (or lowest voltage) just below ground. the worst- case sync tip compression due to the clamp will not exceed 7mv. the input level set by the clamp combined with the internal dc offset will keep the output within its acceptable range. f or symmetric signals like chroma, u, v, pb and pr, the average dc bias is fairly constant and the inputs can be ac-coupled with the addition of a pull-up resistor to set the dc input voltage. da c outputs can also drive these same signals without the ac coupling capacitor. a conceptual illustration of the input clamp circuit is shown below: figure 7. input clamp circuit i/o con?urations f or dc-coupled dac drive with dc-coupled outputs, use this con?uration: figure 8. dc-coupled i/o con?uration alternatively, if the dac s average dc output level causes the signal to exceed the range of 0v to 1.4v, it can be ac-coupled as follows: figure 9. ac-coupled i/o con?uration when the fms6143 is driven by an unknown external source or a scart switch with its own clamping circuitry the inputs should be ac-coupled like this: figure 10. scart i/o con?uration there will be a 280mv offset from the dc input level to the dc output level. v out = 2 * v in + 280mv 0.0 -> 0.02v 0.3 -> 0.32v 0.65 -> 0.67v 1.0 -> 1.02v v in 0.28v 0.88v 1.58v 2.28v driven by: dc-coupled dac outputs ac-coupled and clamped y, cv, r, g, b v out 0.15v 0.5v 0.85v v in 0.58v 1.28v 1.98v driven by: ac-coupled and biased u, v, pb, pr, c v out y out video cables video cables 75 ? 75 ? 75 ? 75 ? driver y in load1 load2 (optional) 0.65 v dvd or stb soc dac output 75 lcvf clamp inactive 0v - 1.4v dvd or stb soc dac output 75 ? lcvf clamp active 0.1u 0v - 1.4v 75 ? lcvf clamp active 0.1u external video source must be ac-coupled. 0v - 1.4v 75 ?
www.fairchildsemi.com 6 fms6143 rev. 3a fms6143 low cost three channel 4th order standard de?ition video filter driver the same method can be used for biased signals with the addition of a pull-up resistor to make sure the clamp never operates. the internal pull-down resistance is 800k ? ?0% so the external resistance should be 7.5m ? to set the dc level to 500mv: figure 11. biased scart i/o con?uration the same circuits can be used with ac-coupled outputs if desired. figure 12. dc-coupled inputs, a c-coupled outputs figure 13. ac-coupled inputs and outputs figure 14. biased ac-coupled inputs, a c-coupled outputs note: the video tilt or line time distortion will be dominated by the ac-coupling capacitor. the value may need to be increased beyond 220 f in order to obtain satisfactory operation in some applications. po wer dissipation the fms6143 output drive con?uration must be considered when calculating overall power dissipation. care must be taken not to exceed the maximum die junction temperature. the f ollowing example can be used to calculate the fms6146 s power dissipation and internal temperature rise. t j = t a + p d ? ja where: p d = p ch1 + p ch2 + p ch3 and p chx = v cc ?i ch - (v o 2 /r l ) where: v o = 2v in + 0.280v i ch = (i cc /3) + (v o /r l ) v in = rms value of input signal i cc = 19ma v cc = 5v r l = channel load resistance board layout can also affect thermal characteristics. refer to the layout considerations section for more information. the fms6143 is speci ed to operate with output currents typically less than 50ma, more than suf?ient for a dual (75 ? ) video load. internal ampli?rs are current limited to a maximum of 100ma and should withstand brief duration short circuit conditions, however this capability is not guaranteed. layout considerations general layout and supply bypassing play major roles in high frequency performance and thermal characteristics. fairchild offers a demonstration board, fms6143demo, to use as a guide for layout and to aid in device testing and characterization. the fms6143demo is a 4-layer board with a full power and g round plane. following this layout con?uration will provide the optimum performance and thermal characteristics. for optimum results, follow the steps below as a basis for high frequency layout: include 1 f and 0.1 f ceramic bypass capacitors place the 1 f capacitor within 0.75 inches of the power pin place the 0.1 f capacitor within 0.1 inches of the power pin ? or multi-layer boards, use a large ground plane to help dissipate heat ? or 2 layer boards, use a ground plane that extends beyond the device by at least 0.5 minimize all trace lengths to reduce series inductances lcvf bias input 0.1u external video source must be ac-coupled. 500mv +/-350mv 75 ? 7.5m ? 75 ? dvd or stb soc dac output lcvf clamp inactive 0v - 1.4v 220 75 ? dvd or stb soc dac output lcvf clamp inactive 0v - 1.4v 220 75 ? lcvf clamp active 0.1 external video source must be ac-coupled. 500mv +/-350mv 220 75 ? 75 ? 75 ?
fms6143 rev. 3a 7 www.fairchildsemi.com fms6143 low cost three channel 4th order standard de?ition video filter driver t ypical application diagram the following circuit may be used for direct dc-coupled drive by dacs with an output voltage range of 0v to 1.4v. ac-coupled or dc- coupled outputs may be used with ac-coupled outputs offering slightly lower power dissipation figure 15. typical application diagram 220uf 220uf +5v fms6143 8l soic in1 out1 in2 in3 out3 vcc 8 7 6 5 1 2 3 4 out2 gnd 0.1 uf 1.0 uf 75 ? 75 ? 75 ? 75 ? 220uf 75 ? 75 ? 75 ? video cables video soc r out b out g out dac load resistors per soc specs. ac-coupling caps are optional. dvd player or stb r g b
www.fairchildsemi.com 8 fms6143 rev. 3a fms6143 low cost three channel 4th order standard de?ition video filter driver mechanical dimensions 8-lead small outline package (soic) h e c l zd c l e d pin no. 1 b a a1 a2 7 l detail-a detail-a c h x 45 note: 1. all dimensions are in millimeters. 2. lead coplanarity should be 0 to 0.10mm (.004") max. 3. package surface finishing: (2.1) top: matte (charmilles #18~30). (2.2) all sides: matte (charmilles #18~30). (2.3) bottom: smooth or matte (charmilles #18~30). 4. all dimensions excluding mold flashes and end flash from the package body shall not exceed 0.152mm (.006) per side (d). symbol min max a1 0.10 0.25 b 0.36 0.46 c 0.19 0.25 d 4.80 4.98 e 3.81 3.99 e 1.27 bsc h 5.80 6.20 h 0.25 0.50 l 0.41 1.27 a 1.52 1.72 0 zd 0.53 ref a2 1.37 1.57 8 soic-8
fms6143 rev. 3a 9 www.fairchildsemi.com fms6143 low cost three channel 4th order standard de?ition video filter driver ordering information t emperature range: 0? to +70? model part number lead free package container pack qty. fms6143 fms6143cs_nl yes soic-8 tube 95 fms6143 fms6143csx_nl yes soic-8 tape and reel 2500
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