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lt6550/lt6551 1 65501fa features applicatio s u descriptio u typical applicatio u automotive displays lcd and crt compatible rgb amplifiers coaxial cable drivers low voltage high speed signal processing set top boxes single supply operation from 3v to 12.6v small (3mm 5mm) msop 10-lead package internal resistors for a gain of two 340v/ s slew rate 110mhz C3db bandwidth 30mhz flat to 0.25db 3% settling time: 20ns input common mode range includes ground rail-to-rail output high output drive: 60ma operating temperature range: C 40 c to 85 c 24-bit rgb 3.3v triple and quad video amplifiers the lt ? 6550/lt6551 are 3.3v triple and quad high speed video amplifiers. these voltage feedback amplifiers drive double terminated 50 ? or 75 ? cables and are configured for a fixed gain of 2, eliminating six or eight external gain setting resistors. the lt6550/lt6551 feature 110mhz C3db bandwidth, high slew rates and fast settling, making them ideal for rgb video processing. the lt6551 quad is designed for single supply operation and the lt6550 triple can be used on either single or split supplies. on a single 3.3v supply, the input voltage range extends from ground to 1.55v and the output swings to within 400mv of the supply voltage while driving a 150 ? load. these features, combined with the ability to accept rgb video signals without the need for ac coupling or level shifting of the incoming signals, make the lt6550/ lt6551 an ideal choice for low voltage video applications. both the lt6550 and lt6551 are available in the small 10-pin msop package and utilize a flow-thru pin out. the small footprint results in a compact high performance video amplifier solution. + C r out 3.3v oa 450 ? 450 ? 75 ? + C g out oa 450 ? 450 ? 75 ? + C b out oa 450 ? 450 ? 75 ? + C sync out r in g in b in sync in gnd oa 450 ? 450 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? lt6551 6551 ta01a v in v out 0v 0v v s = 3.3v v in = 0.5v to 1.25v f = 10mhz 6550/51 ta01b 3.3v single supply lt6551 rgb plus sync cable driver output step response , ltc and lt are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners.
lt6550/lt6551 2 65501fa parameter conditions min typ max units dc output accuracy no load, v out ideal = 1.5v 30 70 mv output voltage matching between any two outputs 25 75 mv input current any input 15 65 a input impedance, ? v in / ? i in v in = 0v to 1v 100 300 k ? input noise voltage density f = 100khz (note 10) 12 nv/ hz input noise current density f = 100khz (note 10) 8 pa/ hz voltage gain (note 5) 0.25v v in 1.25v no load 1.9 2.1 v/v r l = 150 ? 1.9 2.1 v/v r l = 75 ? , 0.25v v in 0.75v 1.85 2.15 v/v output voltage swing low v in = C 0.1v no load 10 30 mv i sink = 5ma 60 150 mv i sink = 10ma 90 200 mv total supply voltage lt6550 (v cc to v ee ) ........................................ 12.6v lt6551 (v cc to gnd) ...................................... 12.6v input current (note 9) ........................................ 10ma output short-circuit duration (note 2) ............ indefinite operating temperature range ................ C 40 c to 85 c absolute axi u rati gs w ww u package/order i for atio uu w (note 1) the denotes the specifications which apply over the specified temperature range, otherwise specifications are at t a = 25 c. v cc = 3.3v, v gnd = 0v; v in = 0.75v lt6550 (pins 1,2,3); lt6551 (pins 1,2,3,4). v ee = 0v lt6550 (pin 5), unless otherwise noted. specified temperature range (note 3) lt6550c/lt6551c ..............................C40 c to 85 c lt6550i/lt6551i ................................ C 40 c to 85 c maximum junction temperature .......................... 150 c storage temperature range ................. C 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c 3.3v electrical characteristics t jmax = 150 c, ja = 110 c/w (note 4) 1 2 3 4 5 in1 in2 in3 in4 gnd 10 9 8 7 6 v cc out1 out2 out3 out4 top view ms10 package 10-lead plastic msop x2 x2 x2 x2 t jmax = 150 c, ja = 110 c/w (note 4) 1 2 3 4 5 in1 in2 in3 gnd v ee 10 9 8 7 6 v cc out1 out2 out3 n/c top view ms10 package 10-lead plastic msop x2 x2 x2 order part number lt6550cms lt6550ims ms10 part marking consult ltc marketing for parts specified with wider operating temperature ranges. ltb9 ltc1 order options tape and reel: add #tr lead free: add #pbf lead free tape and reel: add #trpbf lead free part marking: http://www.linear.com/leadfree/ order part number ms10 part marking lt6551cms lt6551ims ltc2 ltc3
lt6550/lt6551 3 65501fa the denotes the specifications which apply over the specified temperature range, otherwise specifications are at t a = 25 c. v cc = 3.3v, v gnd = 0v; v in = 0.75v lt6550 (pins 1,2,3); lt6551 (pins 1,2,3,4). v ee = 0v lt6550 (pin 5), unless otherwise noted. 3.3v electrical characteristics the denotes the specifications which apply over the specified temperature range, otherwise specifications are at t a = 25 c. v cc = 5v, v gnd = 0v; v in = 1.25v lt6550 (pins 1,2,3); lt6551 (pins 1,2,3,4). v ee = 0v lt6550 (pin 5), unless otherwise noted. 5v electrical characteristics parameter conditions min typ max units output voltage swing high v in = 1.75v no load 3.0 3.2 v r l = 150 ? 2.5 2.9 v r l = 75 ? 2.0 2.5 v psrr v cc = 3v to 10v, v in = 0.5v 40 48 db minimum supply voltage (note 6) 3v output short-circuit current v in = 1v, v out = 0v 35 50 ma 25 ma supply current per amplifier (note 7) 8.5 10 ma 11 ma slew rate (note 8) r l = 150 ? , v out = 0.5v to 2.5v 140 250 v/ s measured from 1v to 2v 115 v/ s small signal C3db bandwidth r l = 150 ? 90 mhz gain flatness less than 0.25db 30 mhz gain matching any one channel to any other channel 0.15 db settling time to 3% r l = 150 ? , v out = 1v to 2.5v 20 ns settling time to 1% r l = 150 ? , v out = 1v to 2.5v 30 ns % overshoot v out = 1v to 2.5v, r l = 150 ? 5% differential gain r l = 150 ? , black level = 0.6v at device output 0.09 % differential phase r l = 150 ? , black level = 0.6v at device output 0.09 deg channel separation measured at 10mhz 60 db parameter conditions min typ max units output accuracy no load, v out ideal = 2.5v 30 70 mv output voltage matching between any two outputs 40 90 mv input current 15 65 a input impedance, ? v in / ? i in v in = 0v to 2v 100 300 k ? input noise voltage density f = 100khz (note 10) 12 nv/ hz input noise current density f = 100khz (note 10) 8 pa/ hz voltage gain (note 5) 0.25v v in 1.75v no load 1.9 2.1 v/v r l = 150 ? 1.9 2.1 v/v r l = 75 ? , 0.25v v in 1.25v, 0 c t a 70 c (only) 1.85 2.15 v/v output voltage swing low v in = C 0.1v no load 10 30 mv i sink = 5ma 60 150 mv i sink = 10ma 90 200 mv output voltage swing high v in = 2.6v no load 4.6 4.8 v r l = 150 ? 3.5 4.1 v r l = 75 ? , 0 c t a 70 c (only) 2.5 3.2 v
lt6550/lt6551 4 65501fa (lt6550 only) the denotes the specifications which apply over the specified temperature range, otherwise specifications are at t a = 25 c. v s = 5v, v in = 0v (pins 1,2,3) v gnd = 0v (pin 4) unless otherwise noted. 5v electrical characteristics the denotes the specifications which apply over the specified temperature range, otherwise specifications are at t a = 25 c. v cc = 5v, v gnd = 0v; v in = 1.25v lt6550 (pins 1,2,3); lt6551 (pins 1,2,3,4). v ee = 0v lt6550 (pin 5), unless otherwise noted. 5v electrical characteristics parameter conditions min typ max units psrr v cc = 3v to 10v, v in = 0.5v 40 48 db minimum supply voltage (note 6) 3v output short-circuit current v in = 1v, v out = 0v 45 60 ma 0 c t a 70 c 40 ma C40 c t a 85 c 30 ma supply current per amplifier (note 7) 9.5 11.5 ma 12.5 ma slew rate r l = 150 ? , v out = 0.5v to 3.5v, 220 340 v/ s measured from 1v to 3v 180 v/ s small signal C3db bandwidth r l = 150 ? 110 mhz gain flatness less than 0.25db 30 mhz gain matching any one channel to any other channel 0.15 db settling time to 3% r l = 150 ? , v out = 1v to 2.5v 20 ns settling time to 1% r l = 150 ? , v out = 1v to 2.5v 35 ns % overshoot v out = 1v to 2.5v, r l = 150 ? 5% differential gain r l = 150 ? , black level = 1v at device output 0.05 % differential phase r l = 150 ? , black level = 1v at device output 0.05 deg channel separation measured at 10mhz 60 db parameter conditions min typ max units output offset 30 70 mv output voltage matching between any two outputs 20 60 mv input current 20 70 a input impedance, ? v in / ? i in v in = C1v to 1v 200 500 k ? input noise voltage density f = 100khz (note 10) 12 nv/ hz input noise current density f = 100khz (note 10) 8 pa/ hz voltage gain C 1.75v v in 1.75v no load 1.9 2.1 v/v r l = 150 ? 1.9 2.1 v/v r l = 75 ? , C 1v v in 1v 1.9 2.1 v/v output voltage swing v in = 2.6v no load 4.6 4.8 v r l = 150 ? 3.5 4.2 v r l = 75 ? , 0 c t a 70 c (only) 2.6 3.2 v psrr v s = 2.5v to 5v, 38 48 db output short-circuit current v o = 0v 45 60 ma 0 c t a 70 c 40 ma C40 c t a 85 c 30 ma
lt6550/lt6551 5 65501fa note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: 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 3: the lt6550c/lt6551c 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 lt6550i/lt6551i are guaranteed to meet specified performance from C 40 c to 85 c. note 4: thermal resistance varies depending upon the amount of pc board metal attached to pin 5 of the device. ja is specified for a 2500mm 2 test board covered with 2oz copper on both sides. note 5: gain is measured by changing the input voltage, and dividing the change in output voltage by the change in input voltage. note 6: minimum supply voltage is guaranteed by the psrr test. note 7: the supply current specification includes additional output current through the internal feedback and gain resistor. note 8: guaranteed by correlation to slew rate at 5v and 5v. note 9: the inputs are protected from esd with diodes to the supplies. note 10: noise is input referred, including internal gain resistors. (lt6550 only) the denotes the specifications which apply over the specified temperature range, otherwise specifications are at t a = 25 c. v s = 5v, v in = 0v (pins 1,2,3) v gnd = 0v (pin 4) unless otherwise noted. 5v electrical characteristics parameter conditions min typ max units supply current per amplifier 8.5 10.5 ma 12 ma slew rate r l = 150 ? , v out = C3v to 3v, 400 600 v/ s measured from C2v to 2v 300 v/ s small signal C3db bandwidth r l = 150 ? 90 mhz gain flatness less than 0.25db 30 mhz gain matching any one channel to any other channel 0.15 db settling time to 3% r l = 150 ? , v out = 1v to 2.5v 20 ns settling time to 1% r l = 150 ? , v out = 1v to 2.5v 30 ns % overshoot v out = 1v to 2.5v, r l = 150 ? 5% differential gain r l = 150 ? , black level = 0v at device output 0.15 % differential phase r l = 150 ? , black level = 0v at device output 0.09 deg channel separation measured at 10mhz 60 db supply current per amplifier vs supply voltage output voltage vs input voltage input bias current vs temperature v cc (v) 0 supply current (ma) 14 12 10 8 6 4 2 0 6550/51 g01 2 10 9 8 7 6 5 1 34 v in (v) 0 v out (v) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 6550/51 g02 0.4 2.0 1.8 1.6 1.4 1.2 1.0 0.2 0.6 0.8 temperature ( c) C50 input bias ( a) C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 0 50 75 6550/51 g03 C25 25 100 125 t a = C55 c t a = 25 c v s = 3.3v, 0v r l = 150 ? v in = 0.75v r l = gnd = 0v v s = 5v, 0v v out = 2.5v t a = 125 c t a = C55 c t a = 25 c t a = 125 c 5v/3.3v typical perfor a ce characteristics uw v ee (pin 5) = 0v (lt6550), gnd (pin 5) = 0v (lt6551)
lt6550/lt6551 6 65501fa frequency (hz) gain (db) 10 9 8 7 6 5 4 3 2 1 0 phase (deg) 0 C20 C40 C60 C80 C100 C120 C140 C160 C180 C200 10k 100k 6550/51 go9 1m 100m 500m 10m v s = 3.3v, 0v v out = 1.5v dc r l = 150 ? phase gain input voltage (v) 0 input bias current ( a) 0 C5 C10 C15 C20 C25 0.6 1.0 1.6 6550/51 g04 0.2 0.4 0.8 1.2 1.4 input voltage (v) 0 input bias current ( a) 0 C5 C10 C15 C20 C25 C30 0.5 1.0 1.5 2.0 6550/51 g05 2.5 sourcing load current (ma) 0.01 0.01 output saturation voltage (v) 0.1 1 1100 6550/51 g06 0.1 10 sinking load current (ma) 0.01 0.01 output saturation voltage (v) 0.1 1 1 100 6550/51 g07 0.10 10 temperature ( c) C50 C25 output short-circuit current (ma) 100 75 90 85 80 75 70 65 60 55 50 45 6550/51 g08 0 25 50 125 v s = 5v, 0v v s = 5v, 0v v s = 3.3v, 0v v s = 3.3v, 0v v in = 1v t a = 125 c t a = C55 c v s = 5v, 0v v in = C 0.1v t a = 25 c t a = 125 c t a = C55 c v s = 5v, 0v v in = 2.6v t a = 25 c t a = 125 c t a = C55 c t a = 25 c t a = 125 c t a = C55 c t a = 25 c v cc (v) 3 C3db bandwidth (mhz) 9 6550/51 g12 412 5 678 10 11 temperature ( c) C50 C25 bandwidth (mhz) 100 75 140 120 100 80 60 40 20 0 6550/51 g11 0 25 50 125 5v, 0v, C3db 5v, 0v, C0.25db 3.3v, 0v, C3db 3.3v, 0v, C0.25db frequency (hz) gain (db) 6.2 6.1 6.0 5.9 5.8 5.7 10k 1m 10m 100m 6550/51 g10 100k v s = 3.3v, 0v v out = 1.5v dc r l = 150 ? v out = 1.5v dc r l = 150 ? 140 160 180 120 100 80 v out = 1.5v dc gnd = 0v r l = 150 ? input bias current vs input voltage input bias current vs input voltage output saturation voltage vs load current (output high) output saturation voltage vs load current (output low) output short-circuit current vs temperature gain and phase vs frequency gain flatness vs frequency ?db, ?.25db bandwidth vs temperature ?db bandwidth vs v cc 5v/3.3v typical perfor a ce characteristics uw v ee (pin 5) = 0v (lt6550), gnd (pin 5) = 0v (lt6551)
lt6550/lt6551 7 65501fa frequency response with capacitive loads capacitive load handling, overshoot vs capacitive load slew rate vs temperature power supply rejection ratio vs frequency output impedance vs frequency channel separation vs frequency gain matching vs frequency 2nd and 3rd harmonic distortion vs frequency small signal response frequency (hz) gain (db) 12 11 10 9 8 7 6 5 4 3 2 10k 100k 6550/51 g13 1m 100m 500m 10m v s = 5v, 0v v out = 2.5v dc r l = 150 ? c l = 150pf c l = 10pf capacitive load (pf) 10 overshoot (%) 45 40 35 30 25 20 15 10 5 0 100 1000 6550/51 g14 temperature ( c) C50 500 450 400 350 300 250 200 150 25 75 6550/51 g15 C25 0 50 100 125 slew rate (v/ s) frequency (hz) power supply rejection ratio (db) 60 50 40 30 20 10 0 10k 1m 10m 1000m 6550/51 g16 100k 100m frequency (hz) gain matching(db) 0 C0.2 C0.4 C0.6 C0.8 C1.0 10k 1m 10m 1000m 6550/51 g19 100k 100m frequency (hz) output impedance ( ? ) 10k 1m 10m 100m 6550/51 g17 100k 100 10 1 0.1 frequency (hz) gain(db) 100 90 80 70 60 50 40 30 20 10 0 10k 1m 10m 1000m 6550/51 g18 100k 100m frequency (hz) 100k distortion (dbc) C30 C40 C50 C60 C70 C80 C90 1m 10m 6550/51 g20 6550/51 g21 v s = 5v, 0v r l = open r l = 150 ? r l = 150 ? 5v, 0v, rising 5v, 0v, falling 3.3v, 0v, rising 3.3v, 0v, falling +pssr v s = 5v, 0v v out = 2.5v dc r l = 150 ? c l = 20pf v s = 5v, 0v v out = 2.5v dc r l = 150 ? v s = 5v, 0v r l = 150 ? any channel pair v s = 5v, 0v v out = 2.5v dc v s = 3.3v, 0v v out = 1.5v dc, any channel pair v s = 3.3v, 0v v o = 2v p-p (0.5v to 2.5v) r l = 150 ? 3rd 2nd c l = 50pf c l = 100pf 5v/3.3v typical perfor a ce characteristics uw v ee (pin 5) = 0v (lt6550), gnd (pin 5) = 0v (lt6551)
lt6550/lt6551 8 65501fa 6550/51 g22 c l = 20pf v s = 5v, 0v v out = 0.5v to 3.5v r l = 150 ? total supply voltage (v) supply current (ma) 14 12 10 8 6 4 2 0 6550/51 g23 0 1 2 3 4 5 6 input voltage (v) C2.5 input bias current ( a) C10 C15 C20 C25 C30 1.5 6550/51 g24 C1.5 C2.0 C1.0 0 1.0 2.0 C0.5 0.5 2.5 temperature ( c) C50 output offset voltage (mv) 100 6550/51 g25 050 60 50 40 30 20 10 0 C10 C20 C25 25 75 125 temperature ( c) C50 25 20 15 10 5 0 25 75 6550/51 g26 C25 0 50 100 125 temperature ( c) C50 25 75 C25 0 50 100 125 output voltage matching (mv) output short-circuit current (ma) 95 90 85 80 75 70 6550/51 g27 v s = 5v v in = 1v frequency (hz) gain(db) 10 9 8 7 6 5 4 3 2 1 0 10k 1m 10m 1000m 6550/51 g28 100k 100m v s = 5v v out = 0v dc r l = 150 ? v out = 0v v s = 5v v in = 0v v s = 5v v in = 0v any channel pair t a = 125 c t a = C55 c t a = 25 c v s = 5v t a = 125 c t a = C55 c t a = 25 c sinking sourcing phase (deg) 0 C20 C40 C60 C80 C100 C120 C140 C160 C180 C200 phase gain supply current vs total supply voltage input bias current vs input voltage output offset voltage vs temperature of three typical units output voltage matching vs temperature of three typical parts output short-circuit current vs temperature gain and phase vs frequency large signal response 5v/3.3v typical perfor a ce characteristics uw 5v typical perfor a ce characteristics uw v gnd (pin 4) = 0v v ee (pin 5) = 0v (lt6550), gnd (pin 5) = 0v (lt6551) (lt6550 only)
lt6550/lt6551 9 65501fa frequency (hz) gain (db) 12 11 10 9 8 7 6 5 4 3 2 mm 10k 100k 6550/51 g31 1m 100m 500m 10m v s = 5v v out = 0v dc r l = 150 ? c l = 150pf c l = 10pf c l = 100pf c l = 50pf temperature ( c) C50 800 750 700 650 600 550 500 25 75 6550/51 g32 C25 0 50 100 125 slew rate (/v s) v s = 5v r l = 150 ? rising falling frequency (hz) power supply rejection ratio (db) 60 50 40 30 20 10 0 C10 10k 1m 10m 1000m 6550/51 g33 100k 100m +psrr Cpsrr v s = 5v v out = 0v dc r l = 150 ? frequency (hz) output impedance ( ? ) 10k 1m 10m 100m 6550/51 g34 100k 100 10 1 0.1 v s = 5v v out = 0v dc frequency (hz) gain (db) 100 90 80 70 60 50 40 30 20 10 0 10k 1m 10m 1000m 6550/51 g35 100k 100m v s = 5v r l = 150 ? any channel pair frequency (hz) 100k distortion (dbc) C30 C40 C50 C60 C70 C80 C90 1m 10m 6550/51 g36 v s = 5v v o = 2v p-p r l = 150 ? 2nd 3rd 6550/51 g37 c l = 20pf v s = 5v r l = 150 ? 0v frequency (hz) gain (db) 6.2 6.1 6.0 5.9 5.8 5.7 10k 1m 10m 100m 6550/51 g29 100k v s = 5v v out = 0v dc r l = 150 ? frequency (hz) gain matching(db) 0 C0.2 C0.4 C0.6 C0.8 C1.0 10k 1m 10m 1000m 6550/51 g30 100k 100m v s = 5v any channel pair gain flatness vs frequency gain matching vs frequency frequency response with capacitive loads slew rate power supply rejection ratio vs frequency output impedance vs frequency channel separation vs frequency 2nd and 3rd harmonic distortion vs frequency large signal response 5v typical perfor a ce characteristics uw v gnd (pin 4) = 0v (lt6550 only)
lt6550/lt6551 10 65501fa lt6550 block diagram block diagra s w + C v cc oa 450 ? 450 ? + C oa 450 ? 450 ? + C oa 450 ? 450 ? in1 in2 in3 gnd v ee out1 out2 out3 n/c 6550 bd01 + C v cc oa 450 ? 450 ? + C oa 450 ? 450 ? + C oa 450 ? 450 ? in1 in2 in3 in4 gnd out1 out2 out3 out4 6551 bd02 + C oa 450 ? 450 ? lt6551 block diagram
lt6550/lt6551 11 65501fa applicatio s i for atio wu u u amplifier characteristics figure 1 shows a simplified schematic of one channel of the lt6551 quad. resistors rf and rg provide an internal gain of 2. (the lt6550 triple is a slight variation with the gain setting resistor, rg, connected to a separate ground pin). the input stage consists of transistors q1 to q8 and resistor r1. this topology allows for high slew rates at low supply voltages. there are back-to-back series diodes, d1 to d4, across the + and C inputs of each amplifier to limit the differential input voltage to 1.4v. r in limits the current through these diodes if the input differential volt- age exceeds 1.4v. the input stage drives the degenera- tion resistors of pnp and npn current mirrors, q9 to q12, that 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. input voltage range the input voltage range is v ee to (v cc C 1.75v) over temperature. if the device is operated on a single 3v supply figure 1. lt6551 simplified schematic the maximum input is (3v C 1.75v) or 1.25v, and the internal gain of two will set the output voltage to 2.5v. increasing the input beyond 1.25v will force the device out of its linear range, no longer a gain of 2, and the output will not increase beyond 2.5v. at a higher supply voltage, i.e. 5v, the maximum input voltage is 5v C 1.75v or 3.25v. however, due to the internal gain of 2, the output will clip with a lower input voltage. for linear unclipped operation the minimum input voltage is (v out min)/2 and the maxi- mum input voltage is (v out max)/2 or (v cc C 1.75v), whichever is less. esd the lt6550/lt6551 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 limited to 10ma or less, no damage to the device will occur. complementary drive generator 6551 f01 out v + gnd desd3 desd4 desd1 desd2 in d3 d4 d1 d2 i1 i2 i3 i4 q1 q2 q3 q4 q5 q10 q13 q9 q12 q14 q11 q6 q7 q8 r in 225 ? rg 450 ? rf 450 ? r1 r2 r3 r4 r5 cm v + gnd v + gnd +C
lt6550/lt6551 12 65501fa power dissipation the lt6550/lt6551, enhanced ja ms package, has pin 5 (v ee for the lt6550 and gnd for the lt6551) fused to the lead frame. this thermal connection increases the efficiency of the pc board as a heat sink. the pcb material can be very effective at transmitting heat between the pad area attached to pin 5 and a ground or power plane layer. copper board stiffeners and plated through holes can also be used to spread the heat generated by the device. table 1 lists the thermal resistance for several different board sizes and copper areas. all measurements were taken on 3/32 fr-4 board with 2oz copper. this data can be used as a rough guideline in estimating thermal resistance. the thermal resistance for each application will be affected by thermal interactions with other components as well as board size and shape. table 1. fused 10-lead msop package copper area topside* backside board area thermal resistance (mm2) (mm2) (mm2) (juntion-to-ambient) 540 540 2500 110 c/w 100 100 2500 120 c/w 100 0 2500 130 c/w 30 0 2500 135 c/w 0 0 2500 140 c/w *device is mounted on topside. as an example, calculate the junction temperature for the circuit in figure 2 assuming an 85 c ambient temperature. the device dissipation can be found by measuring the supply current, calculating the total dissipation and then subtracting the dissipation in the load. the dissipation for the amplifiers is: p d = (106ma)(5v) C 4 ? (2.5v) 2 /150 = 363mw the total package power dissipation is 363mw. when a 2500 sq mm pc board with 540 sq mm of 2oz copper on top and bottom is used, the thermal resistance is 110 c/w. the junction temperature (t j ) is: t j = (363mw)(110 c/w) + 85 c = 125 c the maximum junction temperature for the lt6551 is 150 c so the heat sinking capability of the board is adequate for the application. figure 2. calculating junction temperature + C 5v 1.25v oa 450 ? 450 ? + C oa 450 ? 450 ? + C oa 450 ? 450 ? + C gnd oa 450 ? 450 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? 75 ? lt6551 6551 f02 applicatio s i for atio wu u u
lt6550/lt6551 13 65501fa + C oa 450 ? 450 ? + C oa 450 ? 450 ? + C oa 450 ? 450 ? 6551 ta02 + C oa 450 ? 450 ? 1 2 3 4 5 10 9 8 7 6 75 ? 1k 4k 470 f 75 ? 75 ? 1k 4k 470 f v cc = 5v v cc = 5v luminance chroma 75 ? 75 ? 75 ? out2 out1 s-video connector s-video connector luminance out1 luminance out2 chroma out1 chroma out2 lt6551 s video splitter typical applicatio u
lt6550/lt6551 14 65501fa + C 450 ? 450 ? + C 450 ? 450 ? + C 450 ? 450 ? 1 r g b p r y p b 2 3 45 9 10 8 7 1070 ? 549 ? 2940 ? 75 ? 75 ? 174 ? lt6550 261 ? 75 ? C3.3v 3.3v 3.3v + C 450 ? 450 ? + C 450 ? 450 ? + C 450 ? 450 ? 1 2 3 45 9 10 8 7 105 ? 75 ? 133 ? lt6550 C3.3v 6550/51 tao3 y = 0.299r + 0.587g + 0.114b p b = 0.565(b C y) p r = 0.713(r C y) f 3db 44mhz rgb to yp b p r component-video conversion typical applicatio u consumer products require generation of yp b p r lumi- nance/chrominance component signals, often from rgb source content. the yp b p r format has a luminance signal and two weighted color difference signals at baseband. even with their fixed internal gain resistors, two lt6550s connected as shown easily implement the required con- version matrix equations. the y channel is a weighted average of the 2x amplified rgb signals and with the feedback connection of the y channel output in the second lt6550 back to the gain-resistor common pin, an implicit y subtraction is performed for the chroma channels and the desired unity gain is produced for the y-channel. the necessary scaling of the color-difference signals is per- formed passively by their respective output termination resistor networks. since this circuit naturally produces bipolar chroma signals ( 0.35v at the cable load) regard- less of rgb offset, the simplest implementation is to power the circuit with 3.3v split supplies. with an avail- able output swing of about 5.6v for this supply configura- tion, the circuit handles video with composite syncs and/ or various offsets without difficulty.
lt6550/lt6551 15 65501fa package descriptio u ms package 10-lead plastic msop (reference ltc dwg # 05-08-1661) 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. msop (ms) 0603 0.53 0.152 (.021 .006) seating plane 0.18 (.007) 1.10 (.043) max 0.17 C 0.27 (.007 C .011) typ 0.127 0.076 (.005 .003) 0.86 (.034) ref 0.50 (.0197) bsc 12 3 45 4.90 0.152 (.193 .006) 0.497 0.076 (.0196 .003) ref 8 9 10 7 6 3.00 0.102 (.118 .004) (note 3) 3.00 0.102 (.118 .004) (note 4) 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 0.254 (.010) 0 C 6 typ detail a detail a gauge plane 5.23 (.206) min 3.20 C 3.45 (.126 C .136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.305 0.038 (.0120 .0015) typ 0.50 (.0197) bsc
lt6550/lt6551 16 65501fa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2005 lt 1105 rev a ? printed in usa related parts typical applicatio u part number description comments lt1259/lt1260 dual/triple 130mhz current feedback amplifiers shutdown, operates to 15v lt1395/lt1396/lt1397 single, dual, quad 400mhz current feedback amplifier 800v/ s slew rate lt1398/lt1399 dual/triple 300mhz current feedback amplifier 0.1db gain flatness to 150mhz, shutdown lt1675/lt1675-1 250mhz, triple and single rgb multiplexer with 100mhz pixel switching, C3db bandwidth: 250mhz, current feedback amplifiers 1100v/ s slew rate lt1809/lt1810 single/dual, 180mhz, rail-to-rail input and 350v/ s slew rate, shutdown, output amplifiers low distortion C90dbc at 5mhz 10mhz reference distribution amplifier 450 ? 450 ? 450 ? 450 ? 450 ? 450 ? 1 2 3 10 9 8 7 50 ? 1k 50 ? 450 ? 450 ? 4 5 7 + C oa + C + C oa oa + C oa 10nf 10nf 50 ? 10nf 50 ? 10nf 50 ? 10nf v cc = 3.3v lt6551 10mhz laboratory frequency reference (4dbm max) 6550/51 ta04 4.53k

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