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march 2007 rev 4 1/17 17 tsh343 280mhz single-supply triple video buffer features bandwidth: 280mhz 5v single-supply operation internal input dc level shifter no input capa citor required 6db internal gain for a matching between 3 channels very low harmonic distortion slew rate: 780v/ s specified for 150 and 100 loads min. and max. data tested during production applications high-end video systems high definition tv (hdtv) broadcast and graphic video multimedia products description the tsh343 is a triple single-supply video buffer featuring an internal gain of 6db and a large 280mhz bandwidth. the main advantage of this circuit is that its input dc level shifter allows for video signals on 75 video lines without damage to the synchronization tip of the video signal, while using a single 5v power supply with no input capacitor. the dc level shifter is internally fixed and optimized to keep the output video signals between low and high output rails in the best position for the greatest linearity. this datasheet provides information on using the tsh343 as a y-pb-pr driver for video dac output on a video line. see the tsh344 datasheet for r- g-b signals. the tsh343 is available in the compact so8 plastic package for optimum space-saving. top view out2 1 in2 out1 +vcc 2 3 7 8 out3 in1 4 6 in3 gnd so8 pin1 identification 5 dc shifter 6db 6db 6db www.st.com
tsh343 2/17 contents 1 absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 2 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 using the tsh343 to drive y-pb-pr video components . . . . . . . . . . . . . . 10 3.2 psrr and improvement of power supply noise rejection . . . . . . . . . . . . 12 3.3 delay between channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5 ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
tsh343 absolute maximum rati ngs and operating conditions 3/17 1 absolute maximum ratings and operating conditions table 1. absolute maximum ratings (amr) symbol parameter value unit v cc supply voltage (1) 1. all voltage values, except differential volt age, are with respect to network terminal. 6v v in input voltage range (2) 2. the magnitude of input and output voltages must never exceed v cc +0.3v. 0 to +1.4 v t oper operating free air temperature range -40 to +85 c t stg storage temperature -65 to +150 c t j maximum junction temperature 150 c r thjc so8 thermal resistance junction to case 28 c/w r thja so8 thermal resistance junction to ambient area 157 c/w p max maximum power dissipation (@t amb =25c) for t j =150c 800 mw esd cdm: charged device model hbm: human body model mm: machine model 2 1.5 200 kv kv v table 2. operating conditions symbol parameter value unit v cc power supply voltage 3 to 5.5 (1) 1. tested in full production at 0v/5v single power supply. v
electrical characteristics tsh343 4/17 2 electrical characteristics table 3. v cc = +5v single supply, t amb = 25c (unless otherwise specified) symbol parameter test conditions min. typ. max. unit dc performance v dc input dc shift (see figure 16 for the behaviour in temperature) r l =150 , t amb 400 600 670 mv -40c < t amb < +85c 530 i ib input bias current t amb , input to gnd 18.2 35 a -40c < t amb < +85c 20.7 r in input resistance t amb 4g c in input capacitance t amb 1pf i cc supply current per buffer no load, input to gnd 14.4 18 ma -40c < t amb < +85c 14.9 psrr power supply rejection ratio (1) 20 log ( v out / v cc ) f=1mhz -45 db g dc voltage gain r l =150 , v in = 1v 1.92 1.99 2.05 v/v dg variation of the dc voltage gain between inputs of 0.3v and 1v input step from 0.3v to 1v 0.26 0.8 % mg 1 gain matching between 3 channels input = 1v 0.5 2 % mg 0.3 gain matching between 3 channels input = 0.3v 0.5 2 % dynamic performance and output characteristics bw -3db bandwidth small signal v out = 20mvp r l =150 160 280 mhz gain flatness @ 0.1db small signal v out = 20mvp r l =150 65 fpbw full power bandwidth v out =2v p-p , v icm =0.5v, r l =150 130 200 mhz d delay between each channel (2) 0 to 30mhz 0.5 ns sr slew rate (3) input step from 0v to 1v, r l =150 500 780 v/ s v oh high level output voltage v in dc = +1.5v, r l =150 3.7 3.9 v v ol low level output voltage r l =150 40 mv i out output current v out =2v, t amb 45 90 ma -40c < t amb < +85c 82 output short-circuit current (i source ) 100 ma
tsh343 electrical characteristics 5/17 noise and distortion en total input voltage noise f = 100khz, r in =50 29 nv/ hz 10khz to 30mhz 10khz to 100mhz 158 290 vrms hd2 2nd harmonic distortion v out =2v p-p , r l =150 f= 10mhz f= 30mhz -58 -45 dbc hd3 3rd harmonic distortion v out =2vp-p, r l =150 f= 10mhz f= 30mhz -72 -50 dbc 1. see figure 28 and figure 29 . 2. see figure 30 and figure 31 . 3. non-tested value, guaranteed by design. table 3. v cc = +5v single supply, t amb = 25c (unless otherwise specified) (continued) symbol parameter test conditions min. typ. max. unit
electrical characteristics tsh343 6/17 figure 1. frequency response figure 2. gain flatness 1m 10m 100m 1g -10 -8 -6 -4 -2 0 2 4 6 8 10 vcc=5v load=150 gain (db) frequency (hz) 1m 10m 100m 1g 5,70 5,75 5,80 5,85 5,90 5,95 6,00 6,05 6,10 6,15 6,20 vcc=5v load=150 gain (db) frequency (hz) figure 3. cross-talk vs. frequency (amp1) figure 4. cross-talk vs. frequency (amp2) 1m 10m 100m -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 1/3 1/2 small signal vcc=5v load=150 gain (db) frequency (hz) 1m 10m 100m -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 2/3 2/1 small signal vcc=5v load=150 gain (db) frequency (hz) figure 5. cross-talk vs. frequency (amp3) figure 6. input noise vs. frequency 1m 10m 100m -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 3/2 3/1 small signal vcc=5v load=150 gain (db) frequency (hz) na 10 100 1k 10k 100k 1m 10m 10 100 vcc=5v input in short-circuit input noise (nv/vhz) frequency (hz)
tsh343 electrical characteristics 7/17 figure 7. distortion on 150 load - 10mhz figure 8. distortion on 100 load - 10mhz 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 -100 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 hd2 hd3 vcc=5v f=10mhz input dc component = 0.65v load=150 hd2 & hd3 (dbc) output amplitude (vp-p) 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 -100 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 hd2 hd3 vcc=5v f=10mhz input dc component = 0.65v load=100 hd2 & hd3 (dbc) output amplitude (vp-p) figure 9. distortion on 150 load - 30mhz figure 10. distortion on 100 load - 30mhz 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 -80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 hd2 hd3 vcc=5v f=30mhz input dc component = 0.65v load=150 hd2 & hd3 (dbc) output amplitude (vp-p) 0,00,51,01,52,02,53,03,54,0 -80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 hd2 hd3 vcc=5v f=30mhz input dc component = 0.65v load=100 hd2 & hd3 (dbc) output amplitude (vp-p) figure 11. output dc shift vs. frequency figure 12. slew rate 1m 10m 100m 0,6 0,8 1,0 1,2 1,4 vcc=5v load=150 gain (db) frequency (hz) -5 -4 -3 -2 -1 0 1 2 3 4 5 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 sr- sr+ vcc=5v load=150 output response (v) time (ns)
electrical characteristics tsh343 8/17 figure 13. reverse isolation vs. frequency figure 14. bandwidth vs. temperature 1m 10m 100m -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=5v load=100 gain (db) frequency (hz) -40-20 0 20406080 100 150 200 250 300 350 400 450 500 vcc=5v load=150 bw (mhz) temperature (c) figure 15. quiescent current vs. supply figure 16. input dc shift vs. temperature 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 0 5 10 15 20 25 30 35 40 45 50 vcc=5v input to ground, no load total icc (ma) vcc (v) -40-20 0 20406080 0,2 0,3 0,4 0,5 0,6 0,7 0,8 vcc=5v load=150 dcshift (v) temperature (c) figure 17. i source vs. output voltage figure 18. voltage gain vs. temperature 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 +5v 0v v oh without load v isource isource (ma) v (v) -40-20 0 20406080 1,95 1,96 1,97 1,98 1,99 2,00 2,01 2,02 2,03 2,04 2,05 vcc=5v load=150 gain (db) temperature (c)
tsh343 electrical characteristics 9/17 figure 19. i bias vs. temperature figure 20. gain deviation vs. temperature -40-20 0 20406080 10 12 14 16 18 20 22 24 vcc=5v load=150 i bias ( a) temperature (c) -40 -20 0 20 40 60 80 0,0 0,2 0,4 0,6 0,8 1,0 gain deviation between 0.3v and 1v input voltages vcc=5v load=150 gd (%) temperature (c) figure 21. supply current vs. temperature figure 22. output current vs. temperature -40-20 0 20406080 10 11 12 13 14 15 16 17 vcc=5v no load temperature (c) i cc (ma) -40-20 0 20406080 50 60 70 80 90 100 110 vcc=5v load=150 isource (ma) temperature (c) figure 23. output higher rail vs. temperature figure 24. gain matching vs. temperature -40-20 0 20406080 3,5 3,6 3,7 3,8 3,9 4,0 4,1 4,2 vcc=5v load=150 v oh (v) temperature (c) -40 -20 0 20 40 60 80 0,0 0,2 0,4 0,6 0,8 1,0 gain matching between 3 channels vcc=5v load=150 vin=0.3v and 1v gm (%) temperature (c)
application information tsh343 10/17 3 application information 3.1 using the tsh343 to dri ve y-pb-pr video components figure 25. shapes of video signals coming from dacs figure 26. tsh343 in single supply for any dac output 1. see the tsh344 datasheet on st.com for more informat ion. it is possible to dr ive rgb signals with the tsh344. 10mv gnd 590ns (44t) 27ns (2t) 54ns (4t) 27ns (2t) 590ns (44t) 300mv 300mv black (30 ire) 14.8 s (1100t): 1920*1080i 24.3 s (1800t): 1280*720i ?fclock=74.25mhz ?t=1/fclock=13.5ns synchronization tip (0 ire) white (100 ire) 0.030v 0.330v 1.030v 700mv time frequency amplitude 30mhz 1vp-p pb,b video outputs lpf lpf lpf cable cable cable +5v 75 75 75 tsh343 so8 y,g (+synchro) dac dac dac pr,r g video outputs lpf lpf lpf cable cable cable +5v 75 75 75 tsh344 so8 r dac dac dac b hdtv digital synchro
tsh343 application information 11/17 figure 27. detailed view of one tsh343 channel because of the shape of the signal shown in figure 25 , we use a very low output rail triple high-speed buffer. the tsh343 supplied in 5v single power supply, features a low output rail of 40mv on 150-ohm load. the tsh343 is used to drive high definition video signals up to 30mhz on 75-ohm video lines. it is dedicated to driving ypbpr signals where the synchronization tip?close to zero volt?is included in the y signal. figure 27 shows a solution used on the stmicroelectronics reference design of sti7100 or sti7200 where the dac output is loaded by 140 and the bottom of the synchronization tip is set at 10mv. using the tsh343, an internal input dc value of 600mv is added to the video signal in order to shift the bottom from 10mv to 610mv. the shift is not based on the average of the signal, but is an analog summation of a dc component to the video signal. therefore, no input capacitors are required which provides a real advantage in terms of cost and board space. the internal gain of 2 obtained makes it possible to remove two resistors on the bom. to avoid any perturbation on matching from the dacs output impedance along a large band of 30mhz in hd, a discrete reconstruction filtering is implemented after the driver. this filter is matched on 75-ohms. note that the tsh343 cannot be ac output coupled (it cannot sink an output current, therefore it is not possible to implement an output series capacitor). video line +5v 1/3 tsh343 (gain=2) 0v 0volt 5volt dac 68pf 68pf 470nh 75 75 tv stb 1,22v (10mv+600mv)*gain 3,22v 0volt 5volt 10mv 1,01v 0volt 610mv 1,61v 140 + 600mv dc -5v 5volt
application information tsh343 12/17 3.2 psrr and improvement of power supply noise rejection figure 28. circuit for power supply bypassing figure 29 shows how the power supply noise rejection evolves versus frequency depending on how carefully the power supply decoupling is achieved. figure 29. power supply noise rejection criteria for choosing the ferrite: in dc, the resistance (r) of the ferrite must be as low as possible to keep +5v power supply on the chip. in ac, along a 30mhz bandwidth (hd spectrum), the equivalent impedance (z=r+jx) must be as high as possible to optimize rejection of the noise generated by the power supply. 50 +5v 75 tsh343 t-bias agilent 4395a s r a l c lf c hf 50 +5v 75 tsh343 t-bias agilent 4395a s r a l c lf c hf 100k 1m 10m 100m -80 -70 -60 -50 -40 -30 -20 -10 0 l= ferrite fbmj4516hm900 chf=100nf clf=10uf psrr l=2uh chf=100nf clf=10uf psrr (db) frequency (hz)
tsh343 application information 13/17 3.3 delay between channels figure 30. measurement of the delay between each channel the delay between each video component is an important aspect in high definition video systems. to properly drive the three video components without any relative delay, the tsh343 dice layout has a very symmetrical geometry. the effect is direct on the synchronization of each channel, as shown in figure 31 . there is no delay between channels when the same v in signal is applied on the three inputs. note that the delay between the inputs and the outputs is 4ns. figure 31. relative delay between each channel 75 75 cable 75 75 75 cable 75 75 600mv 75 cable 75 +6db + + +6db + + +6db + + 600mv 600mv 5v vin v1 v2 v3 75 -4ns -2ns 0s 2ns 4ns 6ns 8ns 10ns 12ns 14ns 16ns 18ns 20ns vcc=5v load=150 input (vin) 3 output responses (v1, v2, v3) time
package mechanical data tsh343 14/17 4 package mechanical data in order to meet environmental requirements, stmicroelectronics offers these devices in ecopack ? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an stmicroelectronics trademark. ecopack specifications are available at: www.st.com .
tsh343 package mechanical data 15/17 figure 32. so-8 package ref. dimensions millimeters inches min. typ. max. min. typ. max. a1.750.069 a1 0.10 0.25 0.004 0.010 a2 1.25 0.049 b 0.28 0.48 0.011 0.019 c 0.17 0.23 0.007 0.010 d 4.80 4.90 5.00 0.189 0.193 0.197 e 5.80 6.00 6.20 0.228 0.236 0.244 e1 3.80 3.90 4.00 0.150 0.154 0.157 e 1.27 0.050 h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 k1 81 8 ccc 0.10 0.004
ordering information tsh343 16/17 5 ordering information 6 revision history table 4. order codes part number temperature range package packing marking tsh343id -40c to +85c so-8 tube tsh343i tsh343idt tape & reel tsh343i table 5. document revision history date revision changes 1-dec-2005 1 first release of datasheet. 2-jan-2006 2 capa-load option paragraph deleted on page 11. 10-jul-2006 3 application information. 7-mar-2007 4 max limit for input dc shift reduced from 800mv to 670mv. updated section 3.2: psrr and improvement of power supply noise rejection on page 12 .
tsh343 revision history 17/17 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2007 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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