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1 ? fn7177.1 el5144, el5146, el5244, el5246, el5444 100mhz single-supply rail-to-rail amplifiers the el5144 series amplifiers are voltage-feedback, high speed, rail-to-rail amplifiers designed to operate on a single +5v supply. they offer unity gain stability with an unloaded - 3db bandwidth of 100mhz. the input common-mode voltage range extends from the negative rail to within 1.5v of the positive rail. driving a 75 ? double terminated coaxial cable, the el5144 series amplifiers drive to within 150mv of either rail. the 200v / s slew rate and 0.1%/0.1 differential gain/differential phase makes these parts ideal for composite and component video applications. with their voltage- feedback architecture, these amplifiers can accept reactive feedback networks, allowing them to be used in analog filtering applications these am plifiers will source 90ma and sink 65ma. the el5146 and el5246 have a power-savings disable feature. applying a standard ttl low logic level to the ce (chip enable) pin reduces the supply current to 2.6a within 10ns. turn-on time is 500ns, allowing true break-before- make conditions for multiplexing applications. allowing the ce pin to float or applying a high logic level will enable the amplifier. for applications where board space is critical, singles are offered in a 5-pin sot-23 package, duals in 8- and 10-pin msop packages, and quads in a 16-pin qsop package. singles, duals, and quads are also available in industry- standard pinouts in so and pdip packages. all parts operate over the industrial temperature range of -40 c to +85 c. features rail-to-rail output swing -3db bandwidth = 100mhz single-supply +5v operation power-down to 2.6a large input common-mode range 0v < v cm < 3.5v diff gain/phase = 0.1%/0.1 low power 35mw per amplifier space-saving sot23-5, msop8 & 10, & qsop16 packages pb-free available (rohs compliant) applications video amplifiers 5v analog signal processing multiplexers line drivers portable computers high speed communications sample & hold amplifiers comparators data sheet april 13, 2005 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-352-6832 | intersil (and design) is a registered trademark of intersil americas inc. copyright intersil americas inc. 2003, 2005. all rights reserved all other trademarks mentioned are the property of their respective owners.
2 ordering information part number package tape & reel pkg. dwg. # el5144cw-t7 5-pin sot-23* 7? (3k pcs) mdp0038 el5144cw-t7a 5-pin sot- 23* 7? (250 pcs) mdp0038 el5144cwz-t7 (see note) 5-pin sot-23* (pb-free) 7? (3k pcs) mdp0038 el5144cwz-t7a (see note) 5-pin sot-23* (pb-free) 7? (250 pcs) mdp0038 el5146cn 8-pin pdip - mdp0031 el5146cs 8-pin soic - mdp0027 el5146cs-t7 8-pin soic 7? mdp0027 el5146cs-t13 8-pin soic 13? mdp0027 el5146csz (see note) 8-pin soic (pb-free) - mdp0027 el5146csz-t7 (see note) 8-pin soic (pb-free) 7? mdp0027 el5146csz-t13 (see note) 8-pin soic (pb-free) 13? mdp0027 el5244cn 8-pin pdip - mdp0031 el5244cs 8-pin soic - mdp0027 el5244cs-t7 8-pin soic 7? mdp0027 el5244cs-t13 8-pin soic 13? mdp0027 el5244csz (see note) 8-pin soic (pb-free) - mdp0027 el5244csz-t7 (see note) 8-pin soic (pb-free) 7? mdp0027 el5244csz-t13 (see note) 8-pin soic (pb-free) 13? mdp0027 el5244cy 8-pin msop - mdp0043 el5244cy-t13 8-pin msop 13? mdp0043 el5244cyz (see note) 8-pin msop (pb-free) - mdp0043 el5244cyz-t7 (see note) 8-pin msop (pb-free) 7? mdp0043 el5244cyz-t13 (see note) 8-pin msop (pb-free) 13? mdp0043 el5246cn 14-pin pdip - mdp0031 el5246cs 14-pin soic - mdp0027 el5246cs-t7 14-pin soic 7? mdp0027 el5246cs-t13 14-pin soic 13? mdp0027 el5246csz (see note) 14-pin soic (pb-free) - mdp0027 el5246csz-t7 (see note) 14-pin soic (pb-free) 7? mdp0027 el5246csz-t13 (see note) 14-pin soic (pb-free) 13? mdp0027 el5246cy 10-pin msop - mdp0043 el5246cy-t13 10-pin msop 13? mdp0043 el5246cyz (see note) 10-pin msop (pb-free) - mdp0043 el5246cyz-t7 (see note) 10-pin msop (pb-free) 7? mdp0043 el5246cyz-t13 (see note) 10-pin msop (pb-free) 13? mdp0043 el5444cn 14-pin pdip - mdp0031 el5444cs 14-pin soic - mdp0027 el5444cs-t7 14-pin soic 7? mdp0027 el5444cs-t13 14-pin soic 13? mdp0027 el5444csz (see note) 14-pin soic (pb-free) - mdp0027 el5444csz-t7 (see note) 14-pin soic (pb-free) 7? mdp0027 el5444csz-t13 (see note) 14-pin soic (pb-free) 13? mdp0027 el5444cu 16-pin qsop - mdp0040 el5444cu-t13 16-pin qsop 13? mdp0040 el5444cuz (see note) 16-pin qsop (pb-free) - mdp0040 el5444cuz-t7 (see note) 16-pin qsop (pb-free) 7? mdp0040 EL5444CUZ-T13 (see note) 16-pin qsop (pb-free) 13? mdp0040 *el5144cw symbol is .jxxx where xxx represents date note: intersil pb-free products employ special pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are rohs compliant and compatible with both snpb and pb-free soldering operations. intersil pb-free products are msl classified at pb-free peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jedec j std-020. ordering information (continued) part number package tape & reel pkg. dwg. # el5144, el5146, el 5244, el5246, el5444
3 s pinouts el5144 (5-pin sot-23) top view el5146 & el5146 (8-pin so, pdip) top view el5244 (8-pin soic, pdip, msop) top view el5246 (10-pin msop) top view el5246 (14-pin soic, pdip) top view el5444 (14-pin soic, pdip) top view el5444 (16-pin qsop) top view 1 2 3 5 4 - + out gnd in+ vs in- 1 2 3 4 8 7 6 5 - + nc in- in+ gnd ce vs out nc 1 2 3 4 8 7 6 5 - + in b - out b in a - in a + gnd in b + v s out a - + 1 2 3 4 6 5 10 9 8 7 - + - + in a - out a v s out b in b - in a + cea gnd ceb in b + 1 2 3 4 14 13 12 11 5 6 7 10 9 8 - + - + nc out a in a - out b nc in b - v s nc cea in a + ceb nc in b + gnd 1 2 3 4 14 13 12 11 5 6 7 10 9 8 - + - + - + - + in a - in a + out a in b + in b - out b v s in d + in d - out d in c - in c + out c gnd 1 2 3 4 16 15 14 13 5 6 7 12 11 10 8 9 - + - + - + - + in d + in d - gnd out d in c - in c + out c gnd in a - in a + v s out a in b + in b - out b v s el5144, el5146, el 5244, el5246, el5444
4 absolute maximum ratings (t a = 25c) supply voltage between v s and gnd . . . . . . . . . . . . . . . . . . . . .+6v maximum continuous output current . . . . . . . . . . . . . . . . . . . 50ma power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see curves pin voltages. . . . . . . . . . . . . . . . . . . . . . . . . gnd -0.5v to v s +0.5v storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65c to +150c operating temperature . . . . . . . . . . . . . . . . . . . . . . .-40c to +85c caution: stresses above those listed in ?a bsolute maximum ratings? may cause permanent damage to the device. this is a stress o nly rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. important note: all parameters having min/max specifications are guaranteed. typical values are for information purposes only. u nless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: t j = t c = t a electrical specifications v s = +5v, gnd = 0v, t a = 25c, ce = +2v, unless otherwise specified. parameter description conditions min typ max unit ac performance d g differential gain error (note 1) g = 2, r l = 150 ? to 2.5v, r f = 1k ? 0.1 % d p differential phase error (note 1) g = 2, r l = 150 ? to 2.5v, r f = 1k ? 0.1 bw bandwidth -3db, g = 1, r l = 10k ?, r f = 0 100 mhz -3db, g = 1, r l = 150 ?, r f = 0 60 mhz bw1 bandwidth 0.1db, g = 1, r l = 150 ? to gnd, r f = 0 8 mhz gbwp gain bandwidth product 60 mhz sr slew rate g = 1, r l = 150 ? to gnd, r f = 0, v o = 0.5v to 3.5v 150 200 v/s t s settling time to 0.1%, v out = 0v to 3v 35 ns dc performance a vol open loop voltage gain r l = no load, v out = 0.5v to 3v 54 65 db r l = 150 ? to gnd, v out = 0.5v to 3v 40 50 db v os offset voltage v cm = 1v, sot23-5 and msop packages 25 mv v cm = 1v, all other packages 15 mv t c v os input offset voltage temperature coefficient 10 mv/c i b input bias current v cm = 0v & 3.5v 2 100 na input characteristics cmir common mode input range cmrr 47db 0 3.5 v cmrr common mode rejection ratio dc, v cm = 0 to 3.0v 50 60 db dc, v cm = 0 to 3.5v 47 60 db r in input resistance 1.5 g ? c in input capacitance 1.5 pf output characteristics v op positive output voltage swing r l = 150 ? to 2.5v (note 2) 4.70 4.85 v r l = 150 ? to gnd (note 2) 4.20 4.65 v r l = 1k ? to 2.5v (note 2) 4.95 4.97 v v on negative output voltage swing r l = 150 ? to 2.5v (note 2) 0.15 0.30 v r l = 150 ? to gnd (note 2) 0 v r l = 1k ? to 2.5v (note 2) 0.03 0.05 v +i out positive output current r l = 10 ? to 2.5v 60 90 120 ma -i out negative output current r l = 10 ? to 2.5v -50 -65 -80 ma enable (el5146 & el5246 only) el5144, el5146, el 5244, el5246, el5444
5 t en enable time el5146, el5246 500 ns t dis disable time el5146, el5246 10 ns i ihce ce pin input high current ce = 5v, el5146, el5246 0.003 1 ma i ilce ce pin input low current ce = 0v, el5146, el5246 -1.2 -3 ma v ihce ce pin input high voltage for power up el5146, el5246 2.0 v v ilce ce pin input low voltage for power down el5146, el5246 0.8 v supply is on supply current - enabled (per amplifier) no load, v in = 0v, ce = 5v 7 8.8 ma is off supply current - disabled (per amplifier) no load, v in = 0v, ce = 0v 2.6 5 ma psor power supply operating range 4.75 5.0 5.25 v psrr power supply rejection ratio dc, v s = 4.75v to 5.25v 50 60 db notes: 1. standard ntsc test, ac signal amplitude = 286mv p-p , f = 3.8mhz, v out is swept from 0.8v to 3.4v, r l is dc-coupled. 2. r l is total load resistance due to feedback resistor and load resistor. electrical specifications v s = +5v, gnd = 0v, t a = 25c, ce = +2v, unless otherwise specified. (continued) parameter description conditions min typ max unit el5144, el5146, el 5244, el5246, el5444
6 typical performance curves inverting frequency response (gain) inverting frequenc y response (phase) non-inverting freque ncy response (gain) 1m 10m 0 normalized magnitude (db) frequency (hz) 2 non-inverting freque ncy response (phase) phase () 3db bandwidth vs die temperature for various gains 3db bandwidth vs die temperature for various gains a v =5.6, r f =1k ? a v =1, r f =0 ? -4 -2 -8 -6 100m 1m 10m frequency (hz) 100m a v =2, r f =1k ? v cm =1.5v r l =150 ? a v =5.6, r f =1k ? a v =1, r f =0 ? a v =2, r f =1k ? -45 0 -135 -90 -180 v cm =1.5v r l =150 ? 1m 10m frequency (hz) 100m 0 normalized magnitude (db) 2 -4 -2 -8 -6 a v =-5.6 a v =-1 a v =-2 v cm =1.5v r f =1k ? r l =150 ? 1m 10m frequency (hz) 100m phase () 135 180 45 90 0 a v =-5.6 v cm =1.5v r f =1k ? r l =150 ? a v =-1 a v =-2 -55 25 die temperature (c) 145 -15 65 105 80 3db bandwidth (mhz) 100 40 60 0 20 a v =1, r f =0 ? a v =2, r f =1k ? a v =5.6, r f =1k ? r l =150 ? -55 25 die temperature (c) 145 -15 65 105 120 3db bandwidth (mhz) 150 60 90 0 30 r l =10k ? a v =1, r f =0 ? a v =2, r f =1k ? a v =5.6, r f =1k ? el5144, el5146, el 5244, el5246, el5444
7 typical performance curves (continued) group delay vs frequency frequency response for various r l frequency respons e for various c l frequency response for various r f and r g open loop gain and phase vs frequency open loop voltage gain vs die temperature v cm =1.5v r f =0 ? a v =1 r l =10k ? r l =520 ? r l =150 ? 1m 10m frequency (hz) 100m normalized magnitude (db) 2 4 -2 0 -4 1m 10m frequency (hz) 100m normalized magnitude (db) 4 8 -4 0 -8 c l =100pf c l =47pf c l =22pf c l =0pf v cm =1.5v r l =150 ? a v =1 r f =r g =2k ? r f =r g =1k ? r f =r g =560 ? 1m 10m frequency (hz) 100m normalized magnitude (db) 0 2 -4 -2 -6 v cm =1.5v r l =150 ? a v =2 a v =2 r f =1k ? a v =1 r f =1 ? 1m 10m frequency (hz) 100m group delay (ns) 6 8 2 4 0 10 r l =1k ? r l =150 ? phase gain 90 45 180 135 225 0 gain (db) 60 80 20 40 0 phase () 1k 1m frequency (hz) 100m 10k 10m 100k r l =150 ? no load open loop gain (db) 60 70 40 50 30 80 -55 65 die temperature (c) 145 -15 105 25 el5144, el5146, el 5244, el5246, el5444
8 typical performance curves (continued) output voltage swing vs frequency for thd < 1% output voltage swing vs frequency for thd < 0.1% closed loop output im pedance vs frequency psrr and cmrr vs frequency offset voltage vs die temperature (6 typical samples) voltage noise vs frequency - video amp 10k 1k 100 10 10 100 10k 100m frequency (hz) voltage noise (nv/ hz) 1m 1k 100k 10m closed loop (z o ) 20 2 0.2 200 10k 10m frequency (hz) 100m 100k 1m r f =0 ? a v =2 offset voltage (mv) 6 12 -6 0 -12 -55 65 die temperature (c) 145 -15 105 25 1k 10m frequency (hz) 100m 100k 1m 10k psrr, cmrr (db) -20 0 -60 -40 -80 20 psrr+ cmrr psrr- output voltage swing (v pp ) 3 4 1 2 0 5 1m 10m frequency (hz) 100m r l =150 ? to 2.5v r l =500 ? to 2.5v r f =1k ? a v =2 output voltage swing (v pp ) 3 4 1 2 0 5 1m 10m frequency (hz) 100m r f =1k ? a v =2 r l =150 ? to 2.5v r l =500 ? to 2.5v el5144, el5146, el 5244, el5246, el5444
9 typical performance curves (continued) slew rate vs die temperature large signal pulse re sponse (split supplies) large signal pulse re sponse (single supply) small signal pulse response (single supply) small signal pulse response (split supply) settling time vs settling accuracy output voltage (v) 2 3 1 0 4 time (20ns/div) v s =5v r l =150 ? to 0v r f =1k ? a v =2 v s =5v r l =150 ? to 0v r f =1k ? a v =2 output voltage (v) 1.5 1.7 1.3 1.1 1.9 time (20ns/div) output voltage (v) 0 2 -2 -4 4 time (20ns/div) v s =2.5v r l =150 ? to 0v r f =1k ? a v =2 output voltage (v) 0 0.2 -0.2 -0.4 0.4 time (20ns/div) v s =2.5v r l =150 ? to 0v r f =1k ? a v =2 settling time (ns) 60 80 20 40 0 100 0.01 0.1 settling accuracy (%) 1 r l =1k ? r f =500 ? a v =-1 v step =3v slew rate (v/s) 200 150 250 -55 25 die temperature (c) 145 -15 65 105 el5144, el5146, el 5244, el5246, el5444
10 typical performance curves (continued) differential gain for r l tied to 0v differential phase for r l tied to 0v differential phase for r l tied to 0v differential gain for r l tied to 0v differential gain for r l tied to 2.5v differential phase for r l tied to 2.5v differential gain (%) 0 0.04 -0.04 -0.08 0.08 0.25 1.75 v out (v) 3.25 r f =0 ? a v =1 r l =10k ? r l =150 ? 0.25 1.75 v out (v) 3.25 differential phase () 0 0.1 -0.1 -0.2 0.2 r f =0 ? a v =1 r l =10k ? r l =150 ? 0.5 2 v out (v) 3.5 differential gain (%) 0 0.1 -0.1 -0.2 0.2 r f =0 ? a v =1 r l =10k ? r l =150 ? 0.5 2 v out (v) 3.5 differential phase () 0 0.1 -0.1 -0.2 0.2 r f =0 ? a v =1 r l =10k ? r l =150 ? 0.5 2 v out (v) 3.5 differential gain (%) 0 0.1 -0.1 -0.2 0.2 r l =10k ? r l =150 ? r f =1k ? a v =2 0.5 2 v out (v) 3.5 differential phase () 0 0.1 -0.1 -0.2 0.2 r l =10k ? r l =150 ? r f =1k ? a v =2 el5144, el5146, el 5244, el5246, el5444
11 typical performance curves (continued) 2nd and 3rd harmonic di stortion vs frequency 2nd and 3rd harmonic di stortion vs frequency 2nd and 3rd harmonic distortion vs. frequency differential gain for r l tied to 2.5v differential phase for r l tied to 2.5v channel to channel cro sstalk - duals and quads (worst channel) 0.5 2 v out (v) 3.5 differential gain (%) 0 0.1 -0.1 -0.2 0.2 r l =10k ? r l =150 ? r f =1k ? a v =2 0.5 2 v out (v) 3.5 differential phase () 0 0.1 -0.1 -0.2 0.2 r l =10k ? r l =150 ? r f =1k ? a v =2 1m 10m frequency (hz) 100m distortion (dbc) -45 -35 -55 -75 -25 -65 hd3 hd2 v out =0.25v to 2.25v r l =100 ? to 0v 1m 10m frequency (hz) 100m distortion (dbc) -45 -35 -55 -75 -25 -65 hd3 hd2 v out =0.5v to 2.5v r l =100 ? to 0v hd3 hd2 v out =1v to 3v 1m 10m frequency (hz) 100m distortion (dbc) -45 -35 -55 -75 -25 -65 100k 1m frequency (hz) 100m 10m crosstalk (db) -40 -20 -60 -100 0 -80 2nd and 3rd harmonic distortion vs. frequency hd3 hd2 v out =1v to 3v r l =100 ? to 0v 1m 10m frequency (hz) 100m distortion (dbc) -45 -35 -55 -75 -25 -65 el5144, el5146, el 5244, el5246, el5444
12 typical performance curves (continued) negative output voltage swing vs die temperature supply current (per amp) vs supply voltage output current vs die temperature supply current - on (per amp) vs die temperature supply current - off (per amp) vs die temperature positive output voltage swing vs die temperature 03 supply voltage (v) 5 14 2 supply current (ma) 4 6 2 0 8 -55 die temperature (c) 145 -15 105 65 output current (ma) 60 80 40 20 120 100 25 source sink r l =10 ? to 2.5v -55 die temperature (c) 145 -15 105 65 supply current (ma) 6 7 5 4 9 8 25 -55 die temperature (c) 145 -15 105 65 supply current (a) 2 3 1 0 5 4 25 -55 die temperature (c) 145 -15 105 65 25 output voltage (v) 4.7 4.8 4.6 4.5 5 4.9 r l =150 ? to 2.5v r l =150 ? to 0v r l =150 ? r l =150 ? to 2.5v r l =150 ? to 0v -55 die temperature (c) 145 -15 105 65 25 output voltage (v) 0.2 0.3 0.1 0 0.5 0.4 el5144, el5146, el 5244, el5246, el5444
13 typical performance curves (continued) output voltage from either rail vs die temperature for various effective r load maximum power dissipation vs. ambient temperature duals (t jmax = 150c) power dissipation (w) ambient temperature (c) pdip-14, ja = 87c/w 0 0.5 1.0 1.5 2.5 2.0 -50 104070 -20 100 soic-14, ja = 120c/w pdip-8, ja = 107c/w soic-8, ja = 159c/w msop-8,10, ja = 206c/w maximum power dissipation vs. ambient temperature quads (t jmax = 150c) power dissipation (w) ambient temperature (c) pdip-14, ja = 83c/w 0 0.5 1.0 1.5 2.5 2.0 -50 10 40 70 -20 100 soic-14, ja = 118c/w qsop-16, ja = 158c/w maximum power dissipation vs. ambient temperature singles (t jmax = 150c) power dissipation (w) ambient temperature (c) pdip, ja = 110c/w 0 0.4 0.8 1.2 2.0 1.6 -50 104070 -20 100 soic, ja = 161c/w sot23-5, ja = 256c/w off isolation - el5146 & el5246 -55 die temperature (c) 145 -15 105 65 25 output voltage (v) 10 1 300 100 e f f e c t i v e r l oa d = 1 5 0 ? e f f e c t i v e r l o a d = 1 k ? e f f e c t i v e r l o a d = 5 k ? effective r load = r l //r f to v s /2 10k frequency (hz) 100m 100k 10m 1m magnitude (dbc) -80 -120 -20 -40 -60 -100 el5146cs & el5146cn el5246cn el5246cs el5144, el5146, el 5244, el5246, el5444
14 pin descriptions 5-pin sot23 8-pin so/pdip 8-pin so/pdip/ msop 16-pin msop 14-pin so/pdip 14-pin so/pdip 16-pin qsop name function equivalent circuit 57881144,5vspositive power supply 244341112,13gndgr ound or negative power supply 3 3 in+ noninverting input circuit 1 4 2 in- inverting input (reference circuit 1) 1 6 out amplifier output circuit 2 3 113 3ina+amplifier a noninverting input (reference circuit 1) 2 10 14 2 2 ina- amplifier a inverting input (reference circuit 1) 191311outaamplifier a output (reference circuit 2) 5 575 6inb+amplifier b noninverting input (reference circuit 1) 6 686 7inb-amplifier b inverting input (reference circuit 1) 7 797 8outbamplifier b output (reference circuit 2) 10 11 inc+ amplifier c noninverting input (reference circuit 1) 9 10 inc- amplifier c inverting input (reference circuit 1) 8 9 outc amplifier c output (reference circuit 2) 12 14 ind+ amplifier d noninverting input (reference circuit 1) 13 15 ind- amplifier d inverting input (reference circuit 1) v s gnd v s gnd el5144, el5146, el 5244, el5246, el5444
15 description of oper ation and applications information product description the el5144 series is a family of wide bandwidth, single supply, low power, rail-to-rail output, voltage feedback operational amplifiers. the family includes single, dual, and quad configurations. the singles and duals are available with a power down pin to reduce power to 2.6a typically. all the amplifiers are internally compensated for closed loop feedback gains of +1 or greater. larger gains are acceptable but bandwidth will be reduced according to the familiar gain- bandwidth product. connected in voltage follower mode and driving a high impedance load, the el5144 series has a -3db bandwidth of 100mhz. driving a 150 ? load, they have a -3db bandwidth of 60mhz while maintaining a 200v/s slew rate. the input common mode voltage range includes ground while the output can swing rail to rail. power supply bypassing and printed circuit board layout as with any high-frequency device, good printed circuit board layout is necessary for optimum performance. ground plane construction is highly recommended. lead lengths should be as short as possible. the power supply pin must be well bypassed to reduce the risk of oscillation for normal single supply operation, where the gnd pin is connected to the ground plane, a single 4.7f tantalum capacitor in parallel with a 0.1f ceramic capacitor from v s to gnd will suffice. this same capacitor combination should be placed at each supply pin to ground if split supplies are to be used. in this case, the gnd pin becomes the negative supply rail. for good ac performance, parasitic capacitance should be kept to a minimum. use of wire wound resistors should be avoided because of their additio nal series inductance. use of sockets, particularly for the so package, should be avoided if possible. sockets add parasitic inductance and capacitance that can result in compromised performance. input, output, and supply voltage range the el5144 series has been designed to operate with a single supply voltage of 5v. split supplies can be used so long as their total range is 5v. the amplifiers have an input common mode voltage range that includes the negative su pply (gnd pin) and extends to within 1.5v of the positive supply (v s pin). they are specified over this range. the output of the el5144 series amplifiers can swing rail to rail. as the load resistance becomes lower in value, the ability to drive close to each rail is reduced. however, even with an effective 150 ? load resistor connected to a voltage halfway between the supply rails, the output will swing to within 150mv of either rail. 14 16 outd amplifier d output (reference circuit 2) 8 ce enable (enabled when high) circuit 3 2 3 cea enable amplifier a (enabled when high) (reference circuit 3) 4 5 ceb enable amplifier b (enabled when high) (reference circuit 3) 1,5 2,6, 10,12 nc no connect. not internally connected. pin descriptions (continued) 5-pin sot23 8-pin so/pdip 8-pin so/pdip/ msop 16-pin msop 14-pin so/pdip 14-pin so/pdip 16-pin qsop name function equivalent circuit + ? v s 1.4v gnd el5144, el5146, el 5244, el5246, el5444
16 figure 1 shows the output of th e el5144 series amplifier swinging rail to rail with r f = 1k ? , a v = +2 and r l = 1m ? . figure 2 is with r l = 150 ?. choice of feedback resistor, r f these amplifiers are optimized for applications that require a gain of +1. hence, no feedback resistor is required. however, for gains greater than +1, the feedback resistor forms a pole with the input capacitance. as this pole becomes larger, phase margin is reduced. this causes ringing in the time domain and peaking in the frequency domain. therefore, r f has some maximum value that should not be exceeded for optimum performance. if a large value of r f must be used, a small capacitor in the few picofarad range in parallel with r f can help to reduce this ringing and peaking at the expense of reducing the bandwidth. as far as the output stage of the amplifier is concerned, r f + r g appear in parallel with r l for gains other than +1. as this combination gets smaller, the bandwidth falls off. consequently, r f also has a minimum value that should not be exceeded for optimum performance. for a v = +1, r f = 0 ? is optimum. for a v = -1 or +2 (noise gain of 2), optimum response is obtained with r f between 300 ? and 1k ? . for a v = -4 or +5 (noise gain of 5), keep r f between 300 ? and 15k ? . video performance for good video signal integrity, an amplifier is required to maintain the same output impedance and the same frequency response as dc levels are changed at the output. this can be difficult when driving a standard video load of 150 ? , because of the change in output current with dc level. a look at the differential gain and differential phase curves for various supply and loading conditions will help you obtain optimal performance. curves are provided for a v = +1 and +2, and r l = 150 ? and 10k ? tied both to ground as well as 2.5v. as with all video amp lifiers, there is a common mode sweet spot for optimum differential gain/differential phase. for example, with a v = +2 and r l =150 ? tied to 2.5v, and the output common mode volt age kept between 0.8v and 3.2v, dg/dp is a very low 0.1%/0.1. this condition corresponds to driving an ac-coupled, double terminated 75 ? coaxial cable. with a v = +1, r l = 150 ? tied to ground, and the video level kept between 0.85v and 2.95v, these amplifiers provide dg/dp perf ormance of 0.05%/0.20. this condition is representative of using the el5144 series amplifier as a buffer driving a dc coupled, double terminated, 75 ? coaxial cable. driving high impedance loads, such as signals on computer video cards, gives similar or better dg/dp performance as driving cables. driving cables and capacitive loads the el5144 series amplifiers can drive 50pf loads in parallel with 150 ? with 4db of peaking and 100pf with 7db of peaking. if less peaking is desired in these applications, a small series resistor (usually between 5 ? and 50 ? ) can be placed in series with the output to eliminate most peaking. however, this will obviously reduce the gain slightly. if your gain is greater than 1, the gain resistor (r g ) can then be chosen to make up for any gain loss which may be created by this additional resistor at the output. another method of reducing peaking is to add a ?snubber? circuit at the output. a snubber is a resistor in a series with a capacitor, 150 ? and 100pf being typical values. the advantage of a snubber is that it does not draw dc load current. when used as a cable driver, double termination is always recommended for reflection-free performance. for those applications, the back-termination series resistor will de- couple the el5144 series amplifier from the cable and allow extensive capacitive drive. however, other applications may have high capacitive loads without a back-termination resistor. again, a small series resistor at the output can reduce peaking. disable/power-down the el5146 and el5246 amplifiers can be disabled, placing its output in a high-impedance state. turn off time is only 10ns and turn on time is around 500ns. when disabled, the amplifier?s supply current is reduced to 2.6a typically, thereby effectively eliminat ing power consumption. the amplifier?s power down can be controlled by standard ttl or cmos signal levels at the ce pin. the applied logic signal is 0v 5v figure 1. 0v 5v figure 2. el5144, el5146, el 5244, el5246, el5444
17 relative to the gnd pin. letting the ce pin float will enable the amplifier. hence, the 8-pin pdip and soic single amps are pin compatible with standard amplifiers that don?t have a power down feature. short circuit current limit the el5144 series amplifiers do not have internal short circuit protection circuitry. short circuit current of 90ma sourcing and 65ma sinking typica lly will flow if the output is trying to drive high or low but is shorted to half way between the rails. if an output is s horted indefinitely, the power dissipation could easily increase such that the part will be destroyed. maximum reliability is maintained if the output current never exceeds 50ma. this limit is set by internal metal interconnect limitations . obviously, short circuit conditions must not remain or the internal metal connections will be destroyed. power dissipation with the high output drive capability of the el5144 series amplifiers, it is possible to exceed the 150 c absolute maximum junction temperature under certain load current conditions. therefore, it is important to calculate the maximum junction temperature for the application to determine if load conditions or package type need to be modified for the amplifier to remain in the safe operating area. the maximum power dissipation allowed in a package is determined according to: where: t jmax = maximum junction temperature t amax = maximum ambient temperature ja = thermal resistance of the package pd max = maximum power dissipation in the package the maximum power dissipation actually produced by an ic is the total quiescent supply current times the total power supply voltage, plus the power in the ic due to the load, or: where: n = number of amplifiers in the package v s = total supply voltage i smax = maximum supply current per amplifier v out = maximum output voltage of the application r l = load resistance tied to ground if we set the two pd max equations equal to each other, we can solve for r l : assuming worst case conditions of t a = +85 c, v out =v s /2v, v s = 5.5v, and i smax = 8.8ma per amplifier, below is a table of all packages and the minimum r l allowed. el5144 series comparator application the el5144 series amplifier can be used as a very fast, single supply comparator. most op amps used as a comparator allow only slow speed operation because of output saturation issues. the el5144 series amplifier doesn?t suffer from output saturation issues. figure 3 shows the amplifier implemented as a comparator. figure 4 is a pd max t jmax - t amax ja -------------------------------------------- - = pd max nv s i smax v s ( - v out ) v out r l --------------- - + = part package minimum r l el5144cw sot23-5 37 el5146cs soic-8 21 el5146cn pdip-8 14 el5244cs soic-8 48 el5244cn pdip-8 30 el5244cy msop-8 69 el5246cy msop-10 69 el5246cs soic-14 34 el5246cn pdip-14 23 el5444cu qsop-16 139 el5444cs soic-14 85 el5444cn pdip-14 51 r l v out v s - v out () t jmax - t amax n ja -------------------------------------------- - ?? ?? ?? - v s i smax () --------------------------------------------------------------------------------------------- - = el5144, el5146, el 5244, el5246, el5444
18 graph of propagation delay vs. overdrive as a square wave is presented at the input of the comparator. multiplexing with the el5144 series amplifier besides normal power down usage, the ce pin on the el5146 and el5246 series amplifiers also allow for multiplexing applications. figure 5 shows an el5246 with its outputs tied together, driving a back terminated 75 ? video load. a 3v p-p 10mhz sine wave is applied at amp a input, and a 2.4v p-p 5mhz square wave to amp b. figure 6 shows the select signal that is applied, and the resulting output waveform at v out . observe the break-before-make operation of the multiplexing. amp a is on and v in1 is being passed through to the output of the amplifier. then amp a turns off in about 10ns. the output decays to ground with an r l c l time constants. 500ns later, amp b turns on and v in2 is passed through to the output. this break-before-make operation ensures that more than one amplifier isn?t trying to drive the bus at the same time. notice the outputs are tied directly together. isolation resi stors at each output are not necessary. free running oscillator application figure 7 is an el5144 configured as a free running oscillator. to first order, r osc and c osc determine the frequency of oscillation according to: for rail to rail output swings, maximum frequency of oscillation is around 15mhz. if reduced output swings are acceptable, 25mhz can be achieved. figure 8 shows the 1 2 3 4 8 7 6 5 + ? - + el5146 +5v v in +2.5v v out r l 0.1f propagation delay vs. ov erdrive for amplifier used as a comparator 0.01 0.1 1.0 10 100 1000 propagation delay (ns) overdrive (v) negative going signal positive going signal figure 3. figure 4. 1 2 3 4 14 13 12 11 5 6 7 10 9 8 - + - + select +5v v out 150 ? v in 1 3v pp 10mhz 0.1f 4.7f v in 2 2.4v pp 5mhz el5246 0v 5v figure 6. v out select 0v 5v figure 5. f osc 0.72 r osc c osc --------------------------------------- = el5144, el5146, el 5244, el5246, el5444
19 all intersil u.s. products are manufactured, asse mbled and tested utilizin g iso9000 quality systems. intersil corporation?s quality certifications c an be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corporation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnishe d by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of paten ts 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 intersil or its subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com oscillator for r osc = 510 ? , c osc = 240pf and f osc =6mhz. figure 7. figure 8. 5v v out 0v 1 2 3 5 4 - + +5v 470k 470k 0.1f 470k r osc c osc 0v 5v figure 9. el5144, el5146, el 5244, el5246, el5444

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