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lt6205/LT6206/lt6207 1 620567f applicatio s u features typical applicatio u descriptio u n 450v/ m s slew rate n 100mhz gain bandwidth product n wide supply range 2.7v to 12.6v n output swings rail-to-rail n input common mode range includes ground n high output drive: 50ma n channel separation: 90db at 10mhz n specified on 3v, 5v, and 5v supplies n input offset voltage: 1mv n low power dissipation: 20mw per amplifier on single 5v n operating temperature range: C40 c to 85 c n single in sot-23, dual in msop, quad in ssop package single/dual/quad single supply 3v, 100mhz video op amps the lt ? 6205/LT6206/lt6207 are low cost single/dual/ quad voltage feedback amplifiers that feature 100mhz gain-bandwidth product, 450v/ m s slew rate and 50ma output current. these amplifiers have an input range that includes ground and an output that swings within 60mv of either supply rail, making them well suited for single supply operation. these amplifiers maintain their performance for supplies from 2.7v to 12.6v and are specified at 3v, 5v and 5v. the inputs can be driven beyond the supplies without damage or phase reversal of the output. isolation between channels is high, over 90db at 10mhz. the lt6205 is available in the 5-pin sot-23, and the LT6206 is available in an 8-lead msop package with standard op amp pin-outs. for compact layouts the quad lt6207 is available in the 16-pin ssop package. these devices are specified over the commercial and industrial temperature ranges. , ltc and lt are registered trademarks of linear technology corporation. n video line driver n automotive displays n rgb amplifiers n coaxial cable drivers n low voltage high speed signal processing C + C + LT6206 v in 1 f 75 75 75 75 75 v out1 v out2 3.3v 499 499 499 499 1 7 4 8 6 5 3 2 f 3db 50mhz i s 25ma 620567 ta01a baseband video splitter/cable driver v in v out 20ns/div v s = 3.3v v in = 0.1v to 1.1v f = 10mhz 0v 0v 620567 ta01b output step response
lt6205/LT6206/lt6207 2 620567f total supply voltage (v + to v C ) ............................ 12.6v input current ...................................................... 10ma input voltage range (note 2) ................................... v s output short-circuit duration (note 3) ............ indefinite pin current while exceeding supplies (note 9) .. 25ma ms8 part marking t jmax = 150 c, q ja = 250 c/w lth3 lth4 absolute axi u rati gs w ww u package/order i for atio uu w (note 1) electrical characteristics the l denotes specifications which apply over the specified temperature range, otherwise specifications are at t a = 25 c. v s = 3v, 0v; v s = 5v, 0v; v cm = v out = 1v, unless otherwise noted. symbol parameter conditions min typ max units v os input offset voltage 1 3.5 mv l 5mv input offset voltage match 13 mv (channel-to-channel) (note 5) l 4mv input offset voltage drift (note 6) l 715 m v/ c i b input bias current l 10 30 m a i os input offset current l 0.6 3 m a input noise voltage 0.1hz to 10hz 2 m v p-p e n input noise voltage density f = 10khz 9 nv/ ? hz i n input noise current density f = 10khz 4 pa/ ? hz input resistance v cm = 0v to v + C 2v 1 m w input capacitance 2pf *the temperature grades are identified by a label on the shipping container. consult ltc marketing for parts specified with wid er operating temperature ranges. 1 2 3 4 out a ?n a +in a v 8 7 6 5 v + out b ?n b +in b top view ms8 package 8-lead plastic msop + + operating temperature range .................C40 c to 85 c specified temperature range (note 4) ....C40 c to 85 c storage temperature range ..................C65 c to 150 c maximum junction temperature .......................... 150 c lead temperature (soldering, 10 sec).................. 300 c order part number LT6206cms8 LT6206ims8 s5 part marking* ltaem order part number lt6205cs5 lt6205is5 gn part marking 6207 6207i order part number lt6207cgn lt6207ign top view gn package 16-lead narrow plastic ssop 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 out a ?n a +in a v + +in b ?n b out b nc out d ?n d +in d v +in c ?n c out c nc c + d + b + a + 5 v + 4 ?n out 1 top view s5 package 5-lead plastic sot-23 v 2 +in 3 + t jmax = 150 c, q ja = 135 c/w t jmax = 150 c, q ja = 250 c/w
lt6205/LT6206/lt6207 3 620567f electrical characteristics the l denotes specifications which apply over the specified temperature range, otherwise specifications are at t a = 25 c. v s = 3v, 0v; v s = 5v, 0v; v cm = v out = 1v, unless otherwise noted. symbol parameter conditions min typ max units cmrr common mode rejection ratio v cm = 0 to v + C 2v l 78 90 db input voltage range l 0v + C 2 v psrr power supply rejection ratio v s = 3v to 12v l 67 75 db v cm = v out = 0.5v minimum supply voltage v cm = 0.5v l 2.7 v a vol large-signal voltage gain v s = 5v, v o = 0.5v to 4.5v, r l = 1k l 30 100 v/mv v s = 5v, v o = 1v to 3v, r l = 150 w l 5 20 v/mv v s = 3v, v o = 0.5v to 2.5v, r l = 1k l 20 60 v/mv v ol output voltage swing low (note 7) no load, input overdrive = 30mv l 10 25 mv i sink = 5ma l 75 150 mv v s = 5v, i sink = 25ma l 300 500 mv v s = 3v, i sink = 15ma l 200 350 mv v oh output voltage swing high (note 7) no load, input overdrive = 30mv l 60 100 mv i source = 5ma l 140 250 mv v s = 5v, i source = 25ma l 650 1200 mv v s = 3v, i source = 15ma l 300 500 mv i sc short-circuit current v s = 5v, output shorted to gnd 35 60 ma l 25 ma v s = 3v, output shorted to gnd 30 50 ma l 20 ma i s supply current per amplifier 3.75 5 ma l 5.75 ma gbw gain bandwidth product f = 2mhz l 65 100 mhz sr slew rate v s = 5v, a v = 2, r f = r g = 1k 450 v/ m s v o = 1v to 4v, measured from 1.5v to 3.5v channel separation f = 10mhz 90 db fpbw full power bandwidth v out = 2v p-p (note 8) 71 mhz t s settling time to 3% v s = 5v, d v out = 2v, a v = C1, r l = 150 w 15 ns settling time to 1% 25 ns differential gain v s = 5v, a v = 2, r l = 150 w , output black level =1v 0.05 % differential phase v s = 5v, a v = 2, r l = 150 w , output black level =1v 0.08 deg the l denotes specifications which apply over the specified temperature range, otherwise specifications are at t a = 25 c. v s = 5v; v cm = v out = 0v, unless otherwise noted. symbol parameter conditions min typ max units v os input offset voltage 1.3 4.5 mv l 6mv input offset voltage match 13 mv (channel-to-channel) (note 5) l 4mv input offset voltage drift (note 6) l 10 18 m v/ c i b input bias current l 18 30 m a i os input offset current l 0.6 3 m a input noise voltage 0.1hz to 10hz 2 m v p-p
lt6205/LT6206/lt6207 4 620567f symbol parameter conditions min typ max units e n input noise voltage density f = 10khz 9 nv/ ? hz i n input noise current density f = 10khz 4 pa/ ? hz input resistance v cm = C5v to 3v 1 m w input capacitance 2pf cmrr common mode rejection ratio v cm = C5v to 3v l 78 90 db input voltage range l C5 3 v psrr power supply rejection ratio v s = 2v to 6v l 67 75 db a vol large-signal voltage gain v o = C4v to 4v, r l = 1k l 50 133 v/mv v o = C3v to 3v, r l = 150 w l 7.5 20 v/mv output voltage swing no load, input overdrive = 30mv l 4.88 4.92 v i out = 5ma l 4.75 4.85 v i out = 25ma l 3.8 4.35 v i sc short-circuit current short to ground 40 60 ma l 30 ma i s supply current per amplifier 4 5.6 ma l 6.5 ma gbw gain bandwidth product f = 2mhz l 65 100 mhz sr slew rate a v = C1, r l = 1k 350 600 v/ m s v o = C4v to 4v, measured from C3v to 3v channel separation f = 10mhz 90 db fpbw full power bandwidth v out = 8v p-p (note 8) 14 24 mhz t s settling time to 3% d v out = 2v, a v = C1, r l = 150 w 15 ns settling time to 1% 25 ns differential gain a v = 2, r l = 150 w , output black level = 1v 0.05 % differential phase a v = 2, r l = 150 w , output black level = 1v 0.08 deg electrical characteristics the l denotes specifications which apply over the specified temperature range, otherwise specifications are at t a = 25 c. v s = 5v; v cm = v out = 0v, unless otherwise noted. note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: the inputs are protected by back-to-back diodes. if the differential input voltage exceeds 1.4v, the input current should be limited to less than 10ma. note 3: a heat sink may be required to keep the junction temperature below absolute maximum. this depends on the power supply voltage and how many amplifiers are shorted. note 4: the lt6205c/LT6206c/lt6207c are guaranteed to meet specified performance from 0 c to 70 c and are designed, characterized and expected to meet specified performance from C40 c to 85 c but are not tested or qa sampled at these temperatures. the lt6205i/LT6206i/ lt6207i are guaranteed to meet specified performance from C40 c to 85 c. note 5: matching parameters are the difference between the two amplifiers a and d and between b and c of the lt6207; between the two amplifiers of the LT6206. note 6: this parameter is not 100% tested. note 7: output voltage swings are measured between the output and power supply rails. note 8: full power bandwidth is calculated from the slew rate measurement: fpbw = sr/2 p v peak . note 9: there are reverse biased esd diodes on all inputs and outputs. if these pins are forced beyond either supply, unlimited current will flow through these diodes. if the current is transient in nature and limited to less than 25ma, no damage to the device will occur.
lt6205/LT6206/lt6207 5 620567f total supply voltage (v) 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 change in input offset voltage ( v) 620567 g03 100 0 ?00 ?00 ?00 ?00 ?00 ?00 t a = 25 c t a = ?5 c t a =125 c v os distribution supply current per amplifier vs supply voltage minimum supply voltage change in offset voltage vs input common mode voltage input bias current vs input common mode voltage input bias current vs temperature output saturation voltage vs load current (output low) output saturation voltage vs load current (output high) short-circuit current vs temperature typical perfor a ce characteristics uw temperature ( c) ?0 ?5 0 25 50 75 100 125 input bias current ( a) 620567 g06 ? ? ? ? ? ? ?0 ?1 ?2 v s = 5v, 0v v cm = 1v total supply voltage (v) 0123456789101112 supply current per amplifier (ma) 620567 g02 5 4 3 2 1 0 t a = 25 c t a = ?5 c t a = 125 c input common mode voltage (v) 012345 input bias current ( a) C2 C3 C4 C5 C6 C7 C9 C12 C8 C11 C10 v s = 5v, 0v t a = 25 c t a = C55 c t a = 125 c 620567 g05 load current (ma) 0.1 output saturation voltage (v) 1 0.01 1 10 100 620567 g07 0.01 0.1 10 v s = 5v, 0v v od = 30mv t a = 25 c t a = C55 c t a = 125 c load current (ma) 0.1 output saturation voltage (v) 1 0.01 1 10 100 620567 g08 0.01 0.1 10 t a = 25 c t a = C55 c t a = 125 c v s = 5v, 0v v od = 30mv temperature ( c) C50 C25 0 25 50 75 100 125 output short-circuit current (ma) 620567 g09 75 65 70 60 55 50 45 40 35 v s = 5v, 0v v cm = 1v v s = 3v, 0v v cm = 1v sinking sourcing sinking sourcing input offset voltage (mv) C3C2C10123 percent of units (%) 620567 g01 40 30 35 25 20 15 10 5 0 v s = 5v, 0v v cm = 1v input common mode voltage (v) 012345 offset voltage change ( v) 620567 g04 1000 800 600 400 200 0 t a = 25 c t a = C55 c t a =125 c v s = 5v, 0v
lt6205/LT6206/lt6207 6 620567f frequency (hz) gain (db) 70 60 50 40 30 20 10 0 ?0 ?0 phase (deg) 140 120 100 80 60 40 20 0 -20 -40 100k 10m 100m 500m 620567 g17 1m phase gain v s = 3v, 0v t a = 25 c r l = 1k c l = 5pf v s = 5v v s = 5v v s = 3v, 0v typical perfor a ce characteristics uw short-circuit current vs temperature open-loop gain open-loop gain warm up drift vs time (LT6206) input noise voltage density vs frequency input noise current density vs frequency 0.1hz to 10hz noise voltage gain and phase vs frequency gain bandwidth and phase margin vs supply voltage temperature ( c) ?0 ?5 0 25 50 75 100 125 output short-circuit current (ma) 620567 g10 90 80 70 60 50 40 3o v s = 5v sinking sourcing output voltage (v) 0 1.0 2.0 3.0 4.0 0.5 1.5 2.5 3.5 4.5 5.0 input voltage ( v) 500 400 300 200 100 0 ?00 ?00 ?00 ?00 ?00 r l = 150 r l = 1k 620567 g11 v s = 5v, 0v v cm = 1v t a = 25 c output voltage (v) ? ? ? 1 3 ? ? 0 2 4 5 input voltage ( v) 500 400 300 200 100 0 ?00 ?00 ?00 ?00 ?00 r l = 150 r l = 1k 620567 g12 v s = 5v t a = 25 c frequency (hz) 100 1k 10k 100k input noise voltage density (nv/ hz) 30 25 20 15 10 5 0 620567 g14 v s = 5v, 0v v cm = 1v t a = 25 c frequency (hz) 100 1k 10k 100k 16 14 12 10 8 6 4 2 0 620567 g15 v s = 5v, 0v v cm = 1v t a = 25 c input noise current density (pa/ hz) time (2 sec/div) noise voltage (1 v/div) 620567 g16 v s = 5v, 0v v cm = 1v t a = 25 c total supply voltage (v) 024681012 gain bandwidth (mhz) 620567 g18 110 105 100 95 t a = 25 c r f = r g = 1k c l = 5pf phase margin gain bandwidth phase margin (deg) 50 45 40 35 time after power-up (s) 0 20406080 10 30 50 70 90 100 change in offset voltage ( v) 120 100 80 40 0 60 20 620567 g13 v s = 5v v s = 5v, 0v t a = 25 c
lt6205/LT6206/lt6207 7 620567f typical perfor a ce characteristics uw gain bandwidth and phase margin vs temperature slew rate vs temperature slew rate vs closed-loop gain closed-loop gain vs frequency output impedance vs frequency power supply rejection ratio vs frequency common mode rejection ratio vs frequency channel separation vs frequency series output resistor vs capacitive load temperature ( c) C50 C25 0 25 50 75 125 100 gain bandwidth (mhz) 620567 g19 120 110 100 90 80 phase margin (deg) 55 50 45 40 35 gain bandwidth phase margin v s = 5v v s = 5v v s = 3v, 0v v s = 3v, 0v r l = 1k c l = 5pf temperature ( c) C50 C25 0 25 50 75 125 100 slew rate (v/ s) 620567 g20 750 650 600 700 550 500 450 400 350 rising v s = 5v a v = C1 r g = r f = 1k r l = 1k rising v s = 5v, 0v falling v s = 5v, 0v falling v s = 5v frequency (hz) gain (db) 15 12 9 6 3 0 ? ? ? ?5 ?2 100k 10m 100m 500m 620567 g22 1m v s = 5v v cm = 0v v s = 3v v cm = 1v t a = 25 c c l = 5pf a v = +1 frequency (hz) power supply rejection ratio (db) 90 80 70 60 50 40 30 20 10 0 10k 1m 10m 100m 620567 g24 100k v s = 5v, 0v t a = 25 c ?srr +psrr frequency (hz) 100k 0.1 output impedance ( ) 10 1000 10m 100m 1m 500m 620567 g23 1 100 v s = 5v, 0v t a = 25 c a v = 10 a v = 2 a v = 1 frequency (hz) 1m 120 110 100 90 80 70 60 50 40 voltage gain (db) 10m 100m 620567 g26 v s = 5v LT6206 ch a-b lt6207 ch a-d, ch b-c t a = 25 c capacitive load (pf) 10 40 35 30 25 20 15 10 5 0 overshoot (%) 100 1000 620567 g27 v s = 5v, 0v a v = 1 t a = 25 c r s = 10 , r l = r s = 20 , r l = r l = r s = 50 gain (a v ) 2345 slew rate (v/ s) 620567 g21 750 650 600 700 550 500 400 450 rising v s = 5v v o = C4v to 4v r l = 1k t a = 25 c falling frequency (hz) common mode rejection ratio (db) 10k 1m 10m 1g 620567 g25 100k 100 90 80 70 60 50 40 30 20 10 0 100m v s = 5v t a = 25 c
lt6205/LT6206/lt6207 8 620567f typical perfor a ce characteristics uw series output resistor vs capacitive load maximum undistorted output signal vs frequency distortion vs frequency distortion vs frequency distortion vs frequency distortion vs frequency large signal response v s = 5v, 0v small signal response v s = 5v, 0v capacitive load (pf) 10 40 35 30 25 20 15 10 5 0 overshoot (%) 100 1000 620567 g28 v s = 5v, 0v a v = 2 t a = 25 c r s = 10 , r l = r s = 20 , r l = r l = r s = 50 frequency (mhz) 0.01 0.1 1 10 distortion (db) C30 C40 C50 C60 C70 C80 C90 C100 620567 g31 a v = +1 v o = 2v pCp v s = 5v, 0v r l = 1k, 2nd r l = 1k, 3rd r l = 150 , 3rd r l = 150 , 2nd frequency (mhz) 0.01 0.1 1 10 distortion (db) C30 C40 C50 C60 C70 C80 C90 C100 620567 g32 a v = +2 v o = 2v pCp v s = 5v, 0v r l = 1k, 2nd r l = 1k, 3rd r l = 150 , 3rd r l = 150 , 2nd frequency (mhz) 0.01 0.1 1 10 distortion (db) C30 C40 C50 C60 C70 C80 C90 C100 620567 g33 a v = +1 v o = 2v pCp v s = 5v r l = 1k, 2nd r l = 1k, 3rd r l = 150 , 3rd r l = 150 , 2nd frequency (mhz) 0.01 0.1 1 10 distortion (db) C30 C40 C50 C60 C70 C80 C90 C100 620567 g34 a v = +2 v o = 2v pCp v s = 5v r l = 1k, 3rd r l = 150 , 3rd r l = 150 , 2nd r l = 1k, 2nd 500mv/div v s = 5v, 0v 50ns/div a v = 1 r l = 150 w 620567 g35 0v 50mv/div v s = 5v, 0v 50ns/div a v = 1 r l = 150 w 620567 g36 2.5v frequency (mhz) 0.1 1 10 100 output voltage swing (v pCp ) 10 9 8 7 6 5 4 0 3 2 1 620567 g30 v s = 5v t a = 25 c hd 2 , hd 3 < C30dbc av = 2 av = C1
lt6205/LT6206/lt6207 9 620567f applicatio s i for atio wu uu typical perfor a ce characteristics uw large signal response v s = 5v small signal response v s = 5v output-overdrive recovery 1v/div v s = 5v 50ns/div a v = 1 r l = 150 w 620567 g37 0v 50mv/div v s = 5v 50ns/div a v = 1 r l = 150 w 620567 g38 0v v in (1v/div) v s = 5v, 0v 100ns/div a v = 2 620567 g39 0v 0v v out (2v/div) figure 1. simplified schematic q7 q9 q10 q11 q12 q8 q5 q6 q3 q13 q14 q4 q2 q1 d3 d4 d1 d2 r in 150 r in 150 desd1 desd2 desd5 desd6 desd3 desd4 +in Cin i1 i2 i3 r2 r1 r3 i4 r4 r5 complementary drive generator c m v + v C v + v C v + v C v + v C out 620567 f01
lt6205/LT6206/lt6207 10 620567f applicatio s i for atio wu uu amplifier characteristics figure 1 shows a simplified schematic of the lt6205/ LT6206/lt6207. the input stage consists of transistors q1 to q8 and resistor r1. this topology allows for high slew rates at low supply voltages. the input common mode range extends from ground to typically 1.75v from v cc , and is limited by 2 vbes plus a saturation voltage of a current source. there are back-to-back series diodes, d1 to d4, across the + and C inputs of each amplifier to limit the differential voltage to 1.4v. r in limits the current through these diodes if the input differential voltage ex- ceeds 1.4v. the input stage drives the degeneration resistors of pnp and npn current mirrors, q9 to q12, which convert the differential signals into a single-ended output. the complementary drive generator supplies cur- rent to the output transistors that swing from rail-to-rail. the current generated through r1, divided by the capaci- tor cm, determines the slew rate. note that this current, and hence the slew rate, are proportional to the magnitude of the input step. the input step equals the output step divided by the closed loop gain. the highest slew rates are therefore obtained in the lowest gain configurations. the typical performance characteristic curve of slew rate vs closed loop gain shows the details. esd the lt6205/LT6206/lt6207 have reverse-biased esd protection diodes on all inputs and outputs as shown in figure 1. if these pins are forced beyond either supply unlimited current will flow through these diodes. if the current is transient, and limited to 25ma or less, no damage to the device will occur. layout and passive components with a gain bandwidth product of 100mhz and a slew rate of 450v/ m s the lt6205/LT6206/lt6207 require special attention to board layout and supply bypassing. use a ground plane, short lead lengths and rf-quality low esr supply bypass capacitors. the positive supply pin should be bypassed with a small capacitor (typically 0.01 m f to 0.1 m f) within 0.25 inches of the pin. when driving heavy loads, an additional 4.7 m f electrolytic capacitor should be used. when using split supplies, the same is true for the negative supply pin. for optimum performance all feed- back components and bypass capacitors should be con- tained in a 0.5 inch by 0.5 inch area. this helps ensure minimal stray capacitances. the parallel combination of the feedback resistor and gain setting resistor on the inverting input can combine with the input capacitance to form a pole which can degrade stability. in general, use feedback resistors of 1k or less. capacitive load the lt6205/LT6206/lt6207 are optimized for wide band- width video applications. they can drive a capacitive load of 20pf in a unity-gain configuration. when driving a larger capacitive load, a resistor of 10 w to 50 w should be connected between the output and the capacitive load to avoid ringing or oscillation. the feedback should still be taken from the output pin so that the resistor will isolate the capacitive load and ensure stability. the typical per- formance curves show the output overshoot when driving a capacitive load with different series resistors. video signal characteristics composite video is the most commonly used signal in broadcast-grade products and includes luma (or lumi- nance, the intensity information), chroma (the colorim- etry information) and sync (vertical and horizontal raster timing) elements combined into a single signal, ntsc and pal being the common formats. component video for entertainment systems include separate signal(s) for the luma and chroma (i.e. y/c or ypbpr) with sync generally applied to the luma channel (y signal). in some instances, native rgb signals (separate intensity information for each primary color: red, green, blue) will have sync included as well. all the signal types that include sync are electrically similar from a voltage-swing standpoint, though various timing and bandwidth relationships exist depend- ing on the applicable standard. the typical video waveforms that include sync (including full composite) are specified to have nominal 1v p-p ampli- tude. the lower 0.3v is reserved for sync tips that carry timing information, and by being at a lower potential than all the other information, represents blacker-than-black intensity, thereby causing scan retrace activity to be
lt6205/LT6206/lt6207 11 620567f applicatio s i for atio wu uu invisible on a crt. the black level of the waveform is at (or setup very slightly above) the upper limit of the sync information. waveform content above the black-level is intensity information, with peak brightness represented at the maximum signal level. in the case of composite video, the modulated color subcarrier is superimposed on the waveform, but the dynamics remain inside the 1v p-p limit (a notable exception is the chroma ramp used for differen- tial-gain and differential-phase measurements, which can reach 1.15v p-p ). dc-coupled video amplifier considerations typically video amplifiers drive cables that are series terminated (back-terminated) at the source and load- terminated at the destination with resistances equal to the cable characteristic impedance, z 0 (usually 75 w ). this configuration forms a 2:1 resistor divider in the cabling that must be accounted for in the driver amplifier by delivering 2v p-p output into an effective 2 ? z 0 load (e.g. 150 w ). driving the cable can require more than 13ma while the output is approaching the saturation-limits of the amplifier output. the absolute minimum supply is: v min = 2 + v oh +v ol . for example, the LT6206 dual operating on 3.3v as shown on the front page of this datasheet, with exceptionally low v oh 0.5v and v ol 0.35v, provides a design margin of 0.45v. the design margin must be large enough to include supply variations and dc bias accuracy for the dc-coupled video input. handling ac-coupled video signals ac-coupled video inputs are intrinsically more difficult to handle than those with dc-coupling because the average signal voltage of the video waveform is effected by the picture content, meaning that the black-level at the ampli- fier wanders with scene brightness. the wander is measured as 0.56v for a 1v p-p ntsc waveform changing from black-field to white-field and vice-versa, so an addi- tional 1.12v allowance must be made in the amplifier supply (assuming gain of 2, so v min = 3.12 + v oh +v ol ). for example, an lt6205 operating on 5v has a conserva- tive design margin of 1.03v. the amplifier output (for gain of 2) must swing +1.47v to C1.65v around the dc- operating point, so the biasing circuitry needs to be designed accordingly for optimal fidelity. clamped ac-input cable driver a popular method of further minimizing supply require- ments with ac-coupling is to employ a simple clamping scheme as shown in figure 2. in this circuit, the lt6205 operates from 3.3v by having the sync-tips control the charge on the coupling capacitor c1, thereby reducing the black-level input wander to ? 0.07v. the only minor drawback to this circuit is the slight sync-tip compression ( ? 0.025v at input) due to the diode conduction current, though the picture content remains full fidelity. this circuit has nearly the design margin of its dc-coupled counter- part, at 0.31v (for this circuit, v min = 2.14 + v oh +v ol ). the clamp-diode anode bias is selected to set the sync-tip output voltage at or slightly above v ol . ypbpr to rgb component-video converter the back-page application uses the lt6207 quad to imple- ment a minimum amplifier count topology to transcode consumer component-video into rgb. in this circuit, signals only pass through one active stage from any input to any output, with passive additions being performed by the cable back-termination resistors. the compromise in using passive output addition is that the amplifier outputs must be twice as large as that of a conventional cable driver. the y-channel section also has the demanding requirement that it single-handedly drives all three out- puts to full brightness during times of white content, so a helper current source is used to assure unclipped video when operating from 5v supplies. this circuit maps sync-on-y to sync on all the rgb channels, and for best results should have input black-levels at 0v nominal to prevent clipping.
lt6205/LT6206/lt6207 12 620567f C + lt6205 composite video in 1v pCp 0.1 f c1 4.7 f c2 4.7 f bat54 75 10k 75 video out 3.3v 1k 1k 2.4k 1 2 5 3 4 i s 19ma 620567 ta02 470 figure 2. clamped ac-input video cable driver u typical applicatio
lt6205/LT6206/lt6207 13 620567f package descriptio u s5 package 5-lead plastic tsot-23 (reference ltc dwg # 05-08-1635) 1.50 ?1.75 (note 4) 2.80 bsc 0.30 ?0.45 typ 5 plcs (note 3) datum ? 0.09 ?0.20 (note 3)
lt6205/LT6206/lt6207 14 620567f package descriptio u msop (ms8) 0603 0.53 0.152 (.021 .006) seating plane note: 1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 0.18 (.007) 0.254 (.010) 1.10 (.043) max 0.22 ?0.38 (.009 ?.015) typ 0.127 0.076 (.005 .003) 0.86 (.034) ref 0.65 (.0256) bsc 0 ?6 typ detail ? detail ? gauge plane 12 3 4 4.90 0.152 (.193 .006) 8 7 6 5 3.00 0.102 (.118 .004) (note 3) 3.00 0.102 (.118 .004) (note 4) 0.52 (.0205) ref 5.23 (.206) min 3.20 ?3.45 (.126 ?.136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.42 0.038 (.0165 .0015) typ 0.65 (.0256) bsc ms8 package 8-lead plastic msop (reference ltc dwg # 05-08-1660)
lt6205/LT6206/lt6207 15 620567f package descriptio u gn16 (ssop) 0502 12 3 4 5 6 7 8 .229 ?.244 (5.817 ?6.198) .150 ?.157** (3.810 ?3.988) 16 15 14 13 .189 ?.196* (4.801 ?4.978) 12 11 10 9 .016 ?.050 (0.406 ?1.270) .015 .004 (0.38 0.10) 45 0 ?8 typ .007 ?.0098 (0.178 ?0.249) .053 ?.068 (1.351 ?1.727) .008 ?.012 (0.203 ?0.305) .004 ?.0098 (0.102 ?0.249) .0250 (0.635) bsc .009 (0.229) ref .254 min recommended solder pad layout .150 ?.165 .0250 typ .0165 .0015 .045 .005 *dimension does not include mold flash. mold flash shall not exceed 0.006" (0.152mm) per side **dimension does not include interlead flash. interlead flash shall not exceed 0.010" (0.254mm) per side inches (millimeters) note: 1. controlling dimension: inches 2. dimensions are in 3. drawing not to scale gn package 16-lead plastic ssop (narrow .150 inch) (reference ltc dwg # 05-08-1641) information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
lt6205/LT6206/lt6207 16 620567f part number description comments lt1253/lt1254 low cost dual and quad video amplifiers C3db bandwidth = 90mhz, current feedback lt1395/lt1396/lt1397 single dual quad 400mhz current feedback amplifiers 0.1db flatness to 100mhz, 80ma output drive lt1675 rgb multiplexer with current feedback amplifiers C3db bandwidth = 250mhz, 100mhz pixel switching lt1809/lt1810 single/dual, 180mhz, rail-to-rail input and output amplifiers 350v/ m s slew rate, shutdown, low distortion C90dbc at 5mhz lt6550/lt6551 3.3v triple and quad video amplifiers internal gain of 2, 110mhz C3db bandwidth, input common modes to ground lt6552 3.3v single supply video difference amplifier differential or single-ended gain block, 600v/ m s slew rate, input common modes to ground linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear.com related parts ? linear technology corporation 2003 lt/tp 1003 1k ? printed in usa yp b p r to rgb converter 150 499 150 150 150 107 80.6 499 75 75 r b 150 150 75 g f 3db 40mhz i s 60ma black levels 0v r = y + 1.4 ? p r b = y + 1.8 ? p b g = y C 0.34 ? p b C 0.71 ? p r 620567 ta03 lt6207 14 16 15 12 11 10 13 4 6 7 5 3 2 1 1 f 133 75 36 fmmt3906 cmpd6001s 4.7k 95.3 174 5v 1 f C5v 499 365 499 165 p r p b y C + C + C + C + u typical applicatio

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