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november 2006 ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fms6141 rev. 1.0.0 fms6141 ? low-cost, single-channel 4 th -order standard definition video filter driver fms6141 low-cost, single-channel 4 th -order standard definition video filter driver features ? single 4th-order 8mhz (sd) filter ? drives single, ac- or dc-coupled, video loads (2v pp , 150 ) ? drives dual, ac- or dc-coupled, video loads (2v pp , 75 ) ? transparent input clamping ? ac- or dc-coupled input ? ac- or dc-coupled output ? dc-coupled output eliminates ac-coupling capacitors ? single supply ? robust 10kv esd protection ? lead-free packages: soic-8 or sc70-5 applications ? cable set-top boxes ? satellite set-top boxes ? dvd players ? hdtvs ? personal video recorders (pvr) ? video on demand (vod) description the fms6141 low-cost video filter is intended to replace passive lc filters and drivers with a low-cost integrated device. t he 4th-order filter provides improved image quality compared to typical 2nd or 3rd-order passive solutions. the fms6141 may be directly driven by a dc-coupled dac output or an ac-coupled signal. internal diode clamps and bias circuitry may be used if an ac-coupled input is required (see applicat ion information for details). the fms6141?s output can dr ive an ac- or dc-coupled single (150 ) or dual (75 ) load. dc-coupling the output removes the need for out put coupling capacitors. the input dc level is offs et approximately +280mv at the output (see application information for details). related applications notes ? an-6041 pcb layout considerations for video filter / drivers ? an-6024 fms6xxx product series understanding analog video signal clamps, bias, dc-restore, and ac or dc coupling methods functional block diagram figure 1. fms6141 block diagram video in video ou t 8mhz, 4 th -order 2x t ransparent clamp
fms6141 ? low-cost, single-channel 4 th -order standard definition video filter driver ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fms6141 rev. 1.0.0 2 ordering information part number package pb-free operating temperature range packing method fms6141cs soic-8 yes -40c to +85c tube FMS6141CSX soic-8 yes -40c to +85c tape and reel fms6141s5x sc70-5 yes -40c to +85c tape and reel pin configurations v in v out n/c n/c gnd v cc n/c n/c 1 2 3 4 fms6141 soic-8 8 7 6 5 gnd v cc 1 2 3 fms6141 sc70-5 5 4 gnd v in v out figure 2. fms6141 soic-8 figure 3. fms6141 sc70 pin definitions pin # name description 1 v in video input 2 n/c no connect 3 gnd must be connected to ground 4 n/c no connect 5 n/c no connect 6 n/c no connect 7 v cc +5v supply, do not float 8 v out filtered video output table 1. soic pin definitions pin# name description 1 gnd must be connected to ground 2 gnd must be connected to ground 3 v in video input 4 v out filtered video output 5 v cc +5v supply, do not float table 2. sc70 pin definitions
fms6141 ? low-cost, single-channel 4 th -order standard definition video filter driver ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fms6141 rev. 1.0.0 3 absolute maximum ratings the ?absolute maximum ratings? are those values beyond which the safety of the device cannot be guaranteed. the device should not be operated at t hese limits. the parametric va lues defined in the electric al characteristics tables are not guaranteed at t he absolute maximum ratings. the ?recommended operating conditions? table defines the conditions for actual device operation. parameter min. max. unit dc supply voltage -0.3 6.0 v analog and digital i/o -0.3 v cc +0.3 v output current, do not exceed 50 ma recommended operating conditions parameter min. typ. max. unit operating temperatur e range -40 85 c v cc range 4.75 5.0 5.25 v esd information package soic-8 sc70-5 unit human body model (hbm) 8 10 kv charge device model (cdm) 2 2 kv reliability information symbol parameter min. typ. max. unit t j junction temperature 150 c t stg storage temperature range -65 150 c t l lead temperature (soldering, 10s) 300 c soic-8 115 c/w ja thermal resistance (jedec standard multi-layer test boards, still air) sc70-5 332 c/w
fms6141 ? low-cost, single-channel 4 th -order standard definition video filter driver ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fms6141 rev. 1.0.0 4 dc specifications t a = 25c, v cc = 5.0v, r s = 37.5 ; input is ac coupled with 0.1f; output is ac coupled with 220f into a 150 load; unless otherwise noted. symbol parameter conditions min. typ. max. unit i cc supply current (1) no load 7 12 ma v in video input voltage range referenced to gnd if dc- coupled 1.4 v pp psrr power supply rejection ratio dc 40 db note: 1. 100% tested at 25c. ac electrical specifications t a = 25c, v cc = 5.0v, r s = 37.5 ; input is ac coupled with 0.1f; output is ac coupled with 220f into a 150 load; unless otherwise noted. symbol parameter conditions min. typ. max. unit av channel gain (1) 5.6 6.0 6.4 db f 1db -1db bandwidth (1) 4.0 6.5 mhz f c -3db bandwidth 7.7 mhz f sb attenuation (stopband reject) f = 27mhz 42 db dg differential gain 0.4 % d differential phase 0.4 thd output distortion (all channels) v out = 1.8v pp , 1mhz 0.4 % snr signal-to-noise ratio ntc-7 weighting; 100khz to 4.2mhz 75 db t pd propagation delay delay from input to output, 4.5mhz 55 ns note: 1. 100% tested at 25c.
fms6141 ? low-cost, single-channel 4 th -order standard definition video filter driver ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fms6141 rev. 1.0.0 5 application information input considerations the fms6141 low-cost video filter provides 6db (2x) gain from input to output. the device provides an internal diode clamp to support ac-coupled input signals. in this configurati on, a 0.1f ceramic capacitor is used to ac couple the input signal. if the input signal does not go below ground, the cl amp is inactive; but if the input signal goes below ground, the clamp circuitry sets the bottom of the sync ti p (or lowest voltage) to just below ground. the input level set by the clamp, combined with the internal dc offset, keeps the output signal within an acceptable range. this clamp feature also allows the fms6141?s input to be directly driven (dc-coupled) by a ground referenced dac output. figure 4 shows typical dc voltage levels for the input and output signals when driven by a dc-coupled dac output or an ac-coupled and clamped y, cv signal. 0.28v 0.88v 1.58v 2.28v 0.0 -> 0.02v 0.3 -> 0.32v 0.65 -> 0.67v 1.0 -> 1.02v vin vout figure 4. typical dc voltage levels output considerations the fms6141?s output is dc o ffset from the input by 280mv; therefore v out = 2 ? v in +280mv. this offset is required to obtain optimal performance from the output driver and is held at the mi nimum value to decrease the standing dc current into t he load. since the fms6141 has a 2x (6db) gain, the output is typically connected via a 75 ? -series, back-matching resistor followed by the 75 ? video cable. due to the inherent divide-by-two of this configuration, the blank ing level at the load of the video signal is always less than 1v. when ac-coupling the output, ensure that the c oupling capacitor of choice passes the lowest frequency c ontent in the video signal and that line time distortion (vi deo tilt) is kept as low as possible. the selection of the coupling capacitor is a function of the subsequent circuit?s input impedance and the leakage current of the i nput being driven. to obtain the highest quality output video signal, the series termination resistor must be placed as close to the device?s output pin as possibl e. this greatly reduces parasitic capacitance and i nductance effects on the fms6141?s output driver. the distance from the device?s pin to the series termination resistor should be no greater than 0.1 inches, as shown in figure 5. figure 5. resistor placement
fms6141 ? low-cost, single-channel 4 th -order standard definition video filter driver ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fms6141 rev. 1.0.0 6 i/o configurations figure 6 shows a typical ac -coupled input configuration for driving the filter/driver. using this configuration, a 0.1f ceramic capacitor is used to ac couple the input signal. the coupling capacitor and the input termination resistor at the input of t he filter/driver should be placed close to the input pin for optimal signal integrity. figure 6. typical input configuration y out 75 video cables 75 75 75 75 driver y in load1 load2 (optional) 0.65v 800 k ohms figure 7. conceptual illustration ? input clamp circuit and output driver connected to drive single or dual video loads figure 8. dc-coupled input and dc-coupled output dvd soc 75 lcvf clamp mode r term 0v - 1.4v input buf clamp / bias lpf r term termination & coupling close to device input 0.1f
fms6141 ? low-cost, single-channel 4 th -order standard definition video filter driver ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fms6141 rev. 1.0.0 7 figure 9. ac-coupled input and dc-coupled output figure 10. dc-coupled input and ac-coupled output figure 11. ac-coupled input and ac-coupled output dvd soc 75 lcvf clamp mode r term 0.1 0v - 1.4v dvd soc 75 lcvf clamp mode r term 0v - 1.4v 220f dvd soc 75 lcvf clamp mode r term 0.1 0v - 1.4v 220f
fms6141 ? low-cost, single-channel 4 th -order standard definition video filter driver ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fms6141 rev. 1.0.0 8 layout considerations general layout and supply bypassing play a major role in high-frequency performance and thermal characteristics. fairchild offers a demonstration board for the fms6141 to guide layout and aid device evaluation. the demo board is a four-layer board with full power and ground planes. following this layout configuration provides optimum performance and thermal characteristics fo r the device. for the best results, follow the steps and recommended routing rules listed below. recommended routing/layout rules ? do not run analog and digital signals in parallel. ? use separate analog and digital power planes to supply power. ? traces should run on top of the ground plane at all times. ? no trace should run ov er ground/power splits. ? avoid routing at 90-degree angles. ? minimize clock and video data trace length differences. ? include 10f and 0.1f ceramic power supply bypass capacitors. ? place the 0.1f capacitor wi thin 0.1 inches of the device power pin. ? place the 10f capacitor wi thin 0.75 inches of the device power pin. ? for multilayer boards, use a large ground plane to help dissipate heat. ? for two-layer boards, use a ground plane that extends beyond the device body by at least 0.5 inches on all sides. include a metal paddle under the device on the top layer. ? minimize all trace lengths to reduce series inductance. thermal considerations since the interior of most systems, such as set-top boxes, tvs, and dvd play ers are at +70oc; consideration must be gi ven to providing an adequate heat sink for the device package for maximum heat dissipation. when designing a system board, determine how much power each device dissipates. ensure that devices of high power are not placed in the same location, such as directly above (top plane) and below (bottom plane) each other on the pcb. pcb thermal layout considerations ? understand the system power requirements and environmental conditions. ? maximize thermal performance of the pcb. ? consider using 70m of copper for high-power designs. ? make the pcb as thin as possible by reducing fr4 thickness. ? use vias in power pad to tie adjacent layers together. ? remember that baseline tem perature is a function of board area, not copper thickness. ? modeling techniques can provide a first-order approximation. power dissipation consider the fms6141?s out put drive configuration when calculating overall power dissipation. care must be taken not to exceed the maximum die junction temperature. the followi ng example can be used to calculate the fms6141?s power dissipation and internal temperature rise. t j = t a + p channel ja where p channel = v cc ? i ch + (v o 2 /r l ) v o = 2v in + 0.280v i ch = i cc + (v o /r l ) v in = rms value of input signal i cc = 7ma v s = 5v r l = channel load resistance the fms6141 is specified to operate with output currents typically less than 50ma, which is more than sufficient for a dual (75 ? ) video load. the internal amplifiers of the fms6141 are current limited to a maximum of 100ma and can wi thstand a brief-duration short-circuit condition, but th is capability is not guaranteed.
fms6141 ? low-cost, single-channel 4 th -order standard definition video filter driver ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fms6141 rev. 1.0.0 9 physical dimensions dimensions are in millimeter s unless otherwise noted. figure 12. soic-8 package
fms6141 ? low-cost, single-channel 4 th -order standard definition video filter driver ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fms6141 rev. 1.0.0 10 physical dimensions (continued) dimensions are in millimeter s unless otherwise noted. figure 13. sc70-5 package
fms6141 ? low-cost, single-channel 4 th -order standard definition video filter driver ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fms6141 rev. 1.0.0 11 trademarks the following are registered and unregistered trademarks fairchild semiconductor owns or is authorized to use and is not intend ed to be an exhaustive list of all such trademarks. acex ? globaloptoisolator ? ocxpro ? serdes ? tinybuck ? activearray ? gto ? optologic ? silent switcher ? tinylogic ? bottomless ? hisec ? optoplanar ? smart start ? tinyopto ? build it now ? i 2 c ? pacman ? spm ? tinypower ? coolfet ? i-lo ? pop ? stealth ? tinypwm ? crossvolt ? implieddisconnect ? power247 ? superfet ? trutranslation ? dome ? intellimax ? poweredge ? supersot ? -3 uhc ? ecospark ? isoplanar ? powersaver ? supersot ? -6 ultrafet ? e 2 cmos ? littlefet ? powertrench ? supersot ? -8 unifet ? ensigna ? microcoupler ? qfet ? syncfet ? vcx ? fact ? microfet ? qs ? tcm ? wire ? fact quiet series ? micropak ? qt optoelectronics ? tinyboost ? fast ? microwire ? quiet series ? fastr ? msx ? rapidconfigure ? across the board. around the world. ? fps ? msxpro ? rapidconnect ? programmable active droop ? frfet ? ocx ? scalarpump ? the power franchise ? disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fai rchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. these spec ifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically th e warranty therein, which covers these products. life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. product status definitions definition of terms datasheet identification product status definition advance information formative or in design this datasheet contains the des ign specifications for product development. specifications ma y change in any manner without notice. preliminary first production this datasheet contains preliminar y data; supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice to improve design. no identification needed full production this datasheet contains final spec ifications. fairchild semiconductor reserves the right to make changes at any time without notice to improve design. obsolete not in production this datas heet contains specificati ons on a product that has been discontinued by fairchild semiconduc tor. the datasheet is printed for reference information only. rev. i21

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