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january 2006 rev. 2 1/14 14 TSH344 340mhz single-supply triple video buffer bandwidth: 340mhz 5v single-supply operation low output rail guaranteed at 60mv max. internal gain of 6db for a matching between 3 channels very low harmonic distortion slew rate: 740v/ s specified for 150 ? and 100 ? loads tested on 5v power supply data min. and max. are tested during production description the TSH344 is a triple single-supply video buffer featuring an internal gain of 6db and a large bandwidth of 340mhz. the main advantage of this buffer is its very low output rail very close to gnd when supplied in single supply 0/5v. this output rail is guaranteed by test at 60mv from gnd on 150 ? . chapter 4 of this datasheet gives technical support when using the TSH344 as rgb driver for video dac output on a video line (see tsh343 for y-pb-pr signals). the TSH344 is available in the compact so8 plastic package for optimum space-saving. pin connections (top view) applications high-end video systems high definition tv (hdtv) broadcast and graphic video multimedia products order codes top view out2 1 in2 out1 +vcc 2 3 7 8 out3 in1 4 6 in3 gnd so8 pin1 identification 5 6db 6db 6db part number temperature range package packing marking TSH344id -40c to +85c so-8 tube TSH344i TSH344idt tape & reel TSH344i www.st.com
absolute maximum ratings TSH344 2/14 rev. 2 1 absolute maximum ratings table 1. key parameters and their absolute maximum ratings symbol parameter value unit v cc supply voltage (1) 1. all voltage values, except differential voltage, are with respect to network terminal. 6v v in input voltage range (2) 2. the magnitude of input and output voltage must never exceed v cc +0.3v. 0 to +2 v t oper operating free air temperature range -40 to +85 c t std 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 (@ta=25c) for tj=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 (1) 1. tested in full production at 0v/5v single power supply 3 to 5.5 v
TSH344 electrical characteristics rev. 2 3/14 2 electrical characteristics table 3. v cc = +5v single supply, t amb = 25c (unless otherwise specified) symbol parameter test condition min. typ. max. unit dc performance v os output offset voltage (1) no load, t amb -35 -8 +35 mv -40c < t amb < +85c -8.6 i ib input bias current t amb , input to gnd 5.5 16 a -40c < t amb < +85c 6 rin input resistance t amb 4g ? cin input capacitance t amb 1pf psr power supply rejection ratio 20 log ( ? v cc / ? v out ) input to gnd, f=1mhz, ? v cc =200mv -90 db i cc supply current per buffer no load, input to gnd 10.1 13 ma -40c < t amb < +85c 10.3 g dc voltage gain r l = 150 ?, v in =1v 1.92 2 2.05 v/v 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 v icm =0.6v, r l = 150 ? 190 340 mhz gain flatness @ 0.1db small signal v out =20mvp v icm =0.6v, r l = 150 ? 65 fpbw full power bandwidth v icm =0.6v, v out = 2vp-p, r l = 150 ? 130 200 mhz d delay between each channel 0 to 30mhz 0.5 ns sr slew rate (2) vicm=0.6v, v out = 2vp-p, r l = 150 ? 500 740 v/ s v oh high level output voltage r l = 150 ? 3.7 3.9 v v ol low level output voltage r l = 150 ? 40 60 mv i out output current vout=2vp, t amb 45 93 ma -40c < t amb < +85c 83 output short circuit current (isource) 100 ma
electrical characteristics TSH344 4/14 rev. 2 noise and distortion en total input voltage noise f = 100khz, r in = 50 ? 8nv/ hz r in = 50 ? bw=30mhz bw=100mhz 55 100 vrms hd2 2nd harmonic distortion v out = 2vp-p, r l = 150 ? f= 10mhz f= 30mhz -57 -42 dbc hd3 3rd harmonic distortion v out = 2vp-p, r l = 150 ? f= 10mhz f= 30mhz -72 -51 dbc 1. output offset voltage is determined from the following expression: v out =g. v in + v os 2. non-tested value. guaranteed value by design. table 3. v cc = +5v single supply, t amb = 25c (unless otherwise specified) symbol parameter test condition min. typ. max. unit
TSH344 electrical characteristics rev. 2 5/14 figure 1. frequency response figure 2. gain flatness figure 3. cross-talk vs. frequency (amp1) figure 4. cross-talk vs. frequency (amp2) figure 5. cross-talk vs. frequency (amp3) figure 6. input noise vs. frequency 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 5,2 5,3 5,4 5,5 5,6 5,7 5,8 5,9 6,0 6,1 6,2 vcc=5v load=150 ? gain (db) frequency (hz) 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 -80 -60 -40 -20 0 2/3 2/1 small signal vcc=5v load=150 ? gain (db) frequency (hz) 1m 10m 100m -100 -80 -60 -40 -20 0 3/2 3/1 small signal vcc=5v load=150 ? gain (db) frequency (hz) 10 100 1k 10k 100k 1m 10m 10 100 vcc=5v dc input = 1.5v (battery) input noise (nv/vhz) frequency (hz)
electrical characteristics TSH344 6/14 rev. 2 figure 7. distortion on 150 ? load - 10mhz figure 8. distortion on 100 ? load - 10mhz figure 9. distortion on 150 ? load - 30mhz figure 10. distortion on 100 ? load - 30mhz figure 11. output current figure 12. slew rate 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 = 1.15v 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 = 1.15v load=100 ? 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 = 1.15v 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 = 1.15v load=100 ? hd2 & hd3 (dbc) output amplitude (vp-p) 0,00,51,01,52,02,53,03,54,04,55,0 -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) -2-1012345678 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 sr- sr+ vcc=5v load=150 ? output response (v) time (ns)
TSH344 electrical characteristics rev. 2 7/14 figure 13. reverse isolation vs. frequency figure 14. output swing vs. frequency figure 15. quiescent current vs. supply figure 16. output swing vs. supply figure 17. bandwidth vs. temperature figure 18. voltage gain vs. temperature 1m 10m 100m -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=5v load=150 ? gain (db) frequency (hz) 1m 10m 100m 0 1 2 3 4 5 vcc=5v load=100 ? or load=150 ? vout max. (vp-p) frequency (hz) 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 vcc=5v no load total icc (ma) vcc (v) 3,00 3,25 3,50 3,75 4,00 4,25 4,50 4,75 5,00 0 1 2 3 4 5 vcc=5v f=30mhz load=100 ? or 150 ? vout peak-peak (vp-p) vcc (v) -40-20 0 20406080 100 150 200 250 300 350 400 450 500 vcc=5v load=150 ? bw (mhz) temperature (c) -40-200 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) tem p erature ( c )
electrical characteristics TSH344 8/14 rev. 2 figure 19. ibias vs. temperature figure 20. gain matching vs. temperature figure 21. supply current vs. temperature figure 22. output current vs. temperature figure 23. output higher rail vs. temperature figure 24. output lower rail vs. temperature -40-200 20406080 7 6 5 4 3 2 vcc=5v load=150 ? i bias ( a) temperature (c) -40-200 20406080 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) -40-200 20406080 7 8 9 10 11 vcc=5v no load temperature (c) i cc (ma) -40-200 20406080 50 60 70 80 90 100 vcc=5v load=150 ? isource (ma) temperature (c) -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 20406080 20 25 30 35 40 45 50 vcc=5v load=150 ? v ol (v) temperature (c)
TSH344 power supply considerations and improvement of the psrr rev. 2 9/14 3 power supply considerations and improvement of the psrr correct power supply bypassing is very important for optimizing performance in low and high-frequency ranges. bypass capacitors should be placed as close as possible to the ic pin (pin 4) to improve high-frequency bypassing. a capacitor (c lf ) greater than 100uf is necessary to improve the psrr in low frequencies. for better quality bypassing, a capacitor of 470nf (c hf ) is added using the same implementation conditions to improve the psrr in the higher frequencies. figure 25. circuit for power supply bypassing the following graph in figure 26 shows the evolution of the psrr against the frequency when the power supply decoupling is achieved carefuly or not. figure 26. psrr improvement +v cc c lf + c hf TSH344 r g b 4 5 10k 100k 1m 10m 100m -80 -70 -60 -50 -40 -30 -20 -10 0 c lf =100uf c hf =470nf without capacitor vcc=5v load=150 ? psrr=20 log ( ? vcc/ ? vout) psrr (db) frequency (hz)
using the TSH344 to drive rgb video components TSH344 10/14 rev. 2 4 using the TSH344 to drive rgb video components figure 27. shapes of video signals coming from dacs figure 28. implementation of the video driver on output video dacs 0 ire black level image content 30 ire white level 100 ire 1vp-p 300mv 0volt dac outputs: rgb +5v 75 ? 75 ? cable 75 ? video dac lpf reconstruction filtering r 75 ? 75 ? cable 75 ? video dac g 75 ? video dac b tv TSH344 75 ? cable 75 ? +6db lpf reconstruction filtering +6db lpf reconstruction filtering +6db 300mv 0.7vp-p content of the video signal 0v 600mv 1.4vp-p 0v amplifier output rail (70mv max.) 300mv 0.7vp-p 0v 0.7vpp 1.4vpp 0.7vpp 0.7vpp 1.4vpp 0.7vpp 0.7vpp 1.4vpp 0.7vpp amplifier output rail (3.7v min.) 2.6v -5v (1) dac output (2) amplifier output (3) on the line +5v 75 ? 75 ? cable 75 ? video dac lpf reconstruction filtering r 75 ? 75 ? cable 75 ? video dac g 75 ? video dac b tv TSH344 75 ? cable 75 ? +6db lpf reconstruction filtering +6db lpf reconstruction filtering +6db 300mv 0.7vp-p content of the video signal 0v 600mv 1.4vp-p 0v amplifier output rail (70mv max.) 300mv 0.7vp-p 0v 0.7vpp 0.7vpp 1.4vpp 1.4vpp 0.7vpp 0.7vpp 0.7vpp 0.7vpp 1.4vpp 1.4vpp 0.7vpp 0.7vpp 0.7vpp 0.7vpp 1.4vpp 1.4vpp 0.7vpp 0.7vpp amplifier output rail (3.7v min.) 2.6v -5v (1) dac output (2) amplifier output (3) on the line
TSH344 using the TSH344 to drive rgb video components rev. 2 11/14 figure 28 shows a schematic diagram of the use of the TSH344 to drive video output from dacs. the TSH344 is used to drive high definition video signals up to 30mhz on 75-ohm video lines. it is dedicated to driving rgb signals typically between 300mv and 1v, as seen in (1). with a very low output rail (v ol ) guaranteed in test of production at 60mv maximum, it is possible to drive the signal in single supply without any saturation of the driver against the lower rail. assuming that we lose half of the signal by output impedance-matching in order to properly drive the video line, the shifted signal is multiplied by a gain of 2 or +6db (3). 4.1 delay between channels figure 29. measurement of the delay between each channel delay between each video component is an important aspect in high definition video systems. to drive porperly the three video components without any relative delay, the dice of the TSH344 is layouted out with a very symetrical geometry. the effect is direct on the synchronization of each channel, as shown in figure 30 . no delay appears between each channel when the same vin signal is applied on the three inputs. note that the delay from the inputs the outputs equals 4ns. 75 ? 75 ? cable 75 ? 75 ? 75 ? cable 75 ? 75 ? 75 ? cable 75 ? +6db +6db +6db 5v vin v1 v2 v3 75 ?
using the TSH344 to drive rgb video components TSH344 12/14 rev. 2 figure 30. relative delay between each channel -4ns -2ns 0s 2ns 4ns 6ns 8ns 10ns 12ns 14ns 16ns 18ns 20ns vcc=5v load=150 ? input 3 output responses time
TSH344 package mechanical data rev. 2 13/14 5 package mechanical data dim. mm. inch min. typ max. min. typ. max. a 1.35 1.75 0.053 0.069 a1 0.10 0.25 0.04 0.010 a2 1.10 1.65 0.043 0.065 b 0.33 0.51 0.013 0.020 c 0.19 0.25 0.007 0.010 d 4.80 5.00 0.189 0.197 e 3.80 4.00 0.150 0.157 e 1.27 0.050 h 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 k ? (max.) ddd 0.1 0.04 so-8 mechanical data 0016023/c 8
revision history TSH344 14/14 rev. 2 6 revision history table 4. document revision history date revision description of changes dec. 2005 1 first release of datasheet. jan. 2006 2 capa-load option paragraph deleted in page 11. information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this p ublication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectron ics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicr oelectronics. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners ? 2006 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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