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? 1995 elantec, inc. el2250c/EL2450C general description the el2250c/EL2450C are part of a family of the electronics indus- tries fastest single supply op amps available. prior single supply op amps have generally been limited to bandwidths and slew rates 1/4 that of the el2250c/EL2450C. the 125 mhz bandwidth, 275 v/ m sec slew rate, and 0.05%/0.05 differential gain/differential phase makes this part ideal for single or dual supply video speed applications. with its voltage feedback architecture, this amplifier can accept reactive feed- back networks, allowing them to be used in analog filtering applications. the inputs can sense signals below the bottom supply rail and as high as 1.2v below the top rail. connecting the load resistor to ground and operating from a single supply, the outputs swing com- pletely to ground without saturating. the outputs can also drive to within 1.2v of the top rail. the el2250c/EL2450C will output 100 ma and will operate with single supply voltages as low as 2.7v, mak- ing them ideal for portable, low power applications. the el2250c/EL2450C are available in plastic dip and soic pack- ages in industry standard pin outs. both parts operate over the industrial temperature range of -40 c to +85 c, and are part of a fam- ily of single supply op amps. for single amplifier applications, see the el2150c/el2157c. for dual and triple amplifiers with power down and output voltage clamps, see the el2257c/el2357c. connection diagrams el2250c so, p-dip EL2450C so, p-dip top view top view features ? speci?ed for +3v, +5v, or 5v applications ? large input common mode range 0v < v cm < v s -1.2v ? output swings to ground without saturating ? -3 db bandwidth = 125 mhz ? 0.1 db bandwidth = 30 mhz ? low supply current = 5 ma (per ampli?er) ? slew rate = 275 v/ m sec ? low offset voltage = 2 mv max ? output current = 100 ma ? high open loop gain = 80 db ? differential gain = 0.05% ? differential phase = 0.05 applications ? video ampli?er ? pcmcia applications ? a/d driver ? line driver ? portable computers ? high speed communications ? rgb printer, fax, scanner ? broadcast equipment ? active filtering ordering information part no. temp. range package outline # el2250cn -40 c to +85 c 8 pin pdip mdp0031 el2250cs -40 c to +85 c 8 pin soic mdp0027 EL2450Cn -40 c to +85 c 14 pin pdip mdp0031 EL2450Cs -40 c to +85 c 14 pin soic mdp0027 el2250c/EL2450C 125 mhz single supply dual/quad op amps august 1998, rev b
2 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C absolute maximum ratings (t a = 25 c) supply voltage between v s and gnd +12.6v input voltage (in+, in-) gnd-0.3v,v s +0.3v differential input voltage 6v maximum output current 90 ma output short circuit duration (note 1) power dissipation see curves storage temperature range -65 c to +150 c ambient operating temperature range -40 c to +85 c operating junction temperature 150 c important note: all parameters having min/max specifications are guaranteed. the test level column indicates the specific device testing actual ly performed during production and quality inspection. elantec performs most electrical tests using modern high-speed automatic test equipment, spe cifically the ltx77 series system. unless otherwise noted, all tests are pulsed tests, therefor t j = t c = t a . test level test procedure i 100% production tested and qa sample tested per qa test plan qcx0002. ii 100% production tested at t a = 25 c and qa sample tested at t a = 25 c, t max and t min per qa test plan qcx0002. iii qa sample tested per qa test plan qcx0002. iv parameter is guaranteed (but not tested) by design and characterization data. v parameter is typical value at t a = 25 c for information purposes only. dc electrical characteristics v s =+5v, gnd=0v, t a =25 c, v cm =1.5v, v out =1.5v, unless otherwise specified. parameter description test conditions min typ max test level units v os offset voltage -4 4 imv tcv os offset voltage temperature coef?cient measured from t min to t max 10 v m v/ c ib input bias current v in =0v -5.5 -10 i m a i os input offset current v in =0v -750 150 750 ina tci os input bias current temperature coef?cient measured from t min to t max 50 v na/ c psrr power supply rejection ratio v s =+2.7v to +12v 55 70 idb cmrr common mode vcm=0v to +3.8v 55 65 idb rejection ratio vcm=0v to +3.0v 55 70 idb cmir common mode input range 0 v s -1.2 iv r in input resistance common mode 1 2 im w c in input capacitance soic package 1 vpf pdip package 1.5 vpf r out output resistance a v =+1 40 vm w i s supply current (per ampli?er) v s =+12v 5 6.5 ima psor power supply operating range 2.7 12.0 iv
3 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C 1. internal short circuit protection circuitry has been built into the el2250c/EL2450C. see the applications section. dc electrical characteristics v s =+5v, gnd=0v, t a =25 c, v cm =+1.5v, v out =+1.5v, unless otherwise specified parameter description test conditions min typ max test level units avol open loop gain v s =+12v, v out =+2v to +9v, r l =1 k w to gnd 65 80 idb v out =+1.5v to +3.5v, r l =1 k w to gnd 70 vdb v out =+1.5v to +3.5v, r l =150 w to gnd 60 vdb v op positive output voltage swing v s =+12v, a v =+1, r l =1 k w to 0v 10.8 vv v s =+12v, a v =+1, r l =150 w to 0v 9.6 10.0 iv v s = 5v, a v =+1, r l =1 k w to 0v 4.0 vv v s = 5v, a v =+1, r l =150 w to 0v 3.4 3.8 iv v s =+3v, a v =+1, r l =150 w to 0v 1.8 1.95 iv v on negative output voltage swing v s =+12v, a v =+1, r l =150 w to 0v 5.5 8 imv v s = 5v, a v =+1, r l =1 k w to 0v -4.0 vv v s = 5v, a v =+1, r l =150 w to 0v -3.7 -3.4 iv i out output current [1] v s = 5v, a v =+1, r l =10 w to 0v 75 100 ima v s = 5v, a v =+1, r l =50 w to 0v 60vma closed loop ac electrical characteristics v s =+5v, gnd=0v, t a =25 c, v cm =+1.5v, v out =+1.5v, a v =+1, r f =0 w , r l =150 w to gnd pin, unless otherwise specified [1] parameter description test conditions min typ max test level units bw -3db bandwidth (v out =400 mvp-p) v s =+5v, a v =+1, r f =0 w 125 v mhz v s =+5v, a v =-1, r f =500 w 60 v mhz v s =+5v, a v =+2, r f =500 w 60 v mhz v s =+5v, a v =+10, r f =500 w 6 v mhz v s =+12v, a v =+1, r f =0 w 150 v mhz v s =+3v, a v =+1, r f =0 w 100 v mhz bw 0.1 db bandwidth (v out =400 mvp-p) v s =+12v, a v =+1, r f =0 w 25 v mhz v s =+5v, a v =+1, r f =0 w 30 v mhz v s =+3v, a v =+1, r f =0 w 20 v mhz gbwp gain bandwidth product v s =+12v, @ a v =+10 60 v mhz pm phase margin r l =1 k w , c l =6 pf 55 v sr slew rate v s =+10v, r l =150 w , v out =0v to +6v 200 275 iv/ m s v s =+5v, r l =150 w , v out =0v to +3v 300 vv/ m s t r , t f rise time, fall time 0.1v step 2.8 vns os overshoot 0.1v step 10 v% t pd propagation delay 0.1v step 3.2 vns t s 0.1% settling time v s = 5v, r l =500 w , a v =+1, v out = 3v 40 vns 0.01% settling time v s = 5v, r l =500 w , a v =+1, v out = 3v 75 vns dg differential gain [2] a v =+2, r f =1 k w 0.05 v%
4 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C 1. all ac tests are performed on a warmed up part, except slew rate, which is pulse tested. 2. standard ntsc signal = 286 mvp-p, f=3.58 mhz, as v in is swept from 0.6v to 1.314v. r l is dc coupled. dp differential phase [2] a v =+2, r f =1 k w 0.05 v e n input noise voltage f=10 khz 48 v nv/ ? hz i n input noise current f=10 khz 1.25 v pa/ ? hz closed loop ac electrical characteristics v s =+5v, gnd=0v, t a =25 c, v cm =+1.5v, v out =+1.5v, a v =+1, r f =0 w , r l =150 w to gnd pin, unless otherwise specified [1] parameter description test conditions min typ max test level units
5 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C typical performance curves non-inverting frequency response (gain) non-inverting frequency response (phase) 3 db bandwidth vs temperature for non-inverting gains 3 db bandwidth vs temperature for inverting gains inverting frequency response (phase) inverting frequency response (gain) frequency response for various r l frequency response for various c l non-inverting frequency response vs common mode voltage
6 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C 3 db bandwidth vs supply voltage for non-inverting gains frequency response for various supply voltages, a v = + 1 pssr and cmrr vs frequency psrr and cmrr vs die temperature frequency response for various supply voltages, a v = + 2 3 db bandwidth vs supply voltage for inverting gains open loop gain and phase vs frequency open loop voltage gain vs die temperature closed loop output impedance vs frequency
7 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C large signal step response, v s = +3v large signal step response, v s = +5v large signal step response, v s = +12v small signal step response large signal step response, v s = 5v slew rate vs temperature settling time vs settling accuracy voltage and current noise vs frequency
8 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C differential gain for single supply operation differential phase for single supply operation differential gain and phase for dual supply operation 2nd and 3rd harmonic distortion vs frequency 2nd and 3rd harmonic distortion vs frequency 2nd and 3rd harmonic distortion vs frequency output voltage swing vs frequency for thd < 0.1% output voltage swing vs frequency for unlimited distortion output current vs die temperature
9 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C supply current vs supply voltage (per amplifier) supply current vs die temperature (per amplifier) input resistance vs die temperature offset voltage vs die temperature (4 samples) input bias current vs input voltage input offset current and input bias current vs die temperature positive output voltage swing vs die temperature, r l = 150 w to gnd negative output voltage swing vs die temperature, r l = 150 w to gnd channel to channel isolation vs frequency
10 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C simpli?ed schematic 8-lead plastic dip maximum power dissipation vs ambient temperature 14-lead plastic dip maximum power dissipation vs ambient temperature 8-lead plastic soic maximum power dissipation vs ambient temperature 14-lead plastic soic maximum power dissipation vs ambient temperature
11 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C applications information product description the el2250c/EL2450C are part of a family of the industries fastest single supply operational amplifiers. connected in voltage follower mode, their -3db band- width is 125 mhz while maintaining a 275 v/ m s slew rate. with an input and output common mode range that includes ground, these amplifiers were optimized for single supply operation, but will also accept dual sup- plies. they operate on a total supply voltage range as low as +2.7v or up to +12v. this makes them ideal for +3v applications, especially portable computers. while many amplifiers claim to operate on a single sup- ply, and some can sense ground at their inputs, most fail to truly drive their outputs to ground. if they do succeed in driving to ground, the amplifier often saturates, caus- ing distortion and recovery delays. however, special circuitry built into the el2250c/EL2450C allows the output to follow the input signal to ground without recovery delays. 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 pins must be well bypassed to reduce the risk of oscilla- tion. the combination of a 4.7 m f tantalum capacitor in parallel with a 0.1 m f ceramic capacitor has been shown to work well when placed at each supply pin. for single supply operation, where the gnd pin is connected to the ground plane, a single 4.7 m f tantalum capacitor in paral- lel with a 0.1 m f ceramic capacitor across the v s+ and gnd pins will suffice. for good ac performance, parasitic capacitance should be kept to a minimum. ground plane construction should be used. carbon or metal-film resistors are acceptable with the metal-film resistors giving slightly less peak- ing and bandwidth because of their additional series inductance. use of sockets, particularly for the so pack- age should be avoided if possible. sockets add parasitic inductance and capacitance which will result in some additional peaking and overshoot. supply voltage range and single-supply operation the el2250c/EL2450C have been designed to operate with supply voltages having a span of greater than 2.7v, and less than 12v. in practical terms, this means that the el2250c/EL2450C will operate on dual supplies ranging from 1.35v to 6v. with a single-supply, the el2250c/EL2450C will operate from +2.7v to +12v. performance has been optimized for a single +5v supply. pins 8 and 4 are the power supply pins on the el2250c. the positive power supply is connected to pin 8. when used in single supply mode, pin 4 is connected to ground. when used in dual supply mode, the negative power supply is connected to pin 4. pins 4 and 11 are the power supply pins on the EL2450C. the positive power supply is connected to pin 4. when used in single supply mode, pin 11 is connected to ground. when used in dual supply mode, the negative power supply is connected to pin 11. as supply voltages continue to decrease, it becomes nec- essary to provide input and output voltage ranges that can get as close as possible to the supply voltages. the el2250c/EL2450C have an input voltage range that includes the negative supply and extends to within 1.2v of the positive supply. so, for example, on a single +5v supply, the el2250c/EL2450C have an input range which spans from 0v to 3.8v. the output range of the el2250c/EL2450C is also quite large. it includes the negative rail, and extends to within 1v of the top supply rail with a 1 k w load. on a +5v supply, the output is therefore capable of swinging from 0v to +4v. on split supplies, the output will swing 4v. if the load resistor is tied to the negative rail and split supplies are used, the output range is extended to the negative rail. choice of feedback resistor, r f the feedback resistor forms a pole with the input capac- itance. as this pole becomes larger, phase margin is reduced. this increases ringing in the time domain and peaking in the frequency domain. therefore, r f has some maximum value which should not be exceeded for
12 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C optimum performance. if a large value of r f must be used, a small capacitor in the few picofarad range in par- allel 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 has a minimum value that should not be exceeded for optimum performance. for a v = +1, r f = 0 w is optimum. for a v = -1 or +2 (noise gain of 2), optimum response is obtained with r f between 500 w and 1 k w . for av = -4 or +5 (noise gain of 5), keep r f between 2 k w and 10 k w . video performance for good video performance, an amplifier is required to maintain the same output impedance and the same fre- quency response as dc levels are changed at the output. this can be difficult when driving a standard video load of 150 w , because of the change in output current with dc level. differential gain and differential phase for the el2250c/EL2450C are specified with the black level of the output video signal set to +1.2v. this allows ample room for the sync pulse even in a gain of +2 con- figuration. this results in dg and dp specifications of 0.05% and 0.05 while driving 150 w at a gain of +2. setting the black level to other values, although accept- able, will compromise peak performance. for example, looking at the single supply dg and dp curves for r l =150 w , if the output black level clamp is reduced from 1.2v to 0.6v dg/dp will increase from 0.05%/0.05 to 0.08%/0.25 note that in a gain of +2 configuration, this is the lowest black level allowed such that the sync tip doesnt go below 0v. if your application requires that the output goes to ground, then the output stage of the el2250c/EL2450C, like all other single supply op amps, requires an external pull down resistor tied to ground. as mentioned above, the current flowing through this resistor becomes the dc bias current for the output stage npn transistor. as this current approaches zero, the npn turns off, and dg and dp will increase. this becomes more critical as the load resistor is increased in value. while driving a light load, such as 1 k w , if the input black level is kept above 1.25v, dg and dp are a respectable 0.03% and 0.03 . for other biasing conditions see the differential gain and differential phase vs. input voltage curves. output drive capability in spite of their moderately low 5 ma of supply current, the el2250c/EL2450C are capable of providing 100 ma of output current into a 10 w load, or 60 ma into 50 w . with this large output current capability, a 50 w load can be driven to 3v with v s = 5v, making it an excellent choice for driving isolation transformers in telecommunications applications. driving cables and capacitive loads when used as a cable driver, double termination is always recommended for reflection-free performance. for those applications, the back-termination series resis- tor will de-couple the el2250c/EL2450C from the cable and allow extensive capacitive drive. however, other applications may have high capacitive loads with- out a back-termination resistor. in these applications, a small series resistor (usually between 5 w and 50 w ) can be placed in series with the output to eliminate most peaking. 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. video sync pulse remover application all cmos analog to digital converters (a/ds) have a parasitic latch-up problem when subjected to negative input voltage levels. since the sync tip contains no use- ful video information and it is a negative going pulse, we can chop it off. figure 1 shows a unity gain connected amplifier a of an el2250c. figure 2 shows the complete input video sig- nal applied at the input, as well as the output signal with the negative going sync pulse removed.
13 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C short circuit current limit the el2250c/EL2450C have internal short circuit pro- tection circuitry that protect it in the event of its output being shorted to either supply rail. this limit is set to around 100 ma nominally and reduces with increasing junction temperature. it is intended to handle temporary shorts. if an output is shorted indefinitely, the power dis- sipation could easily increase such that the part will be destroyed. maximum reliability is maintained if the out- put current never exceeds 90 ma. a heat sink may be required to keep the junction temperature below absolute maximum when an output is shorted indefinitely. power dissipation with the high output drive capability of the el2250c/EL2450C, it is possible to exceed the 150 c absolute maximum junction temperature under certain load current conditions. therefore, it is important to cal- culate the maximum junction temperature for the application to determine if power-supply voltages, load conditions, or package type need to be modified for the el2250c/EL2450C to remain in the safe operating area. the maximum power dissipation allowed in a package is determined according to [1]: where: t jmax = maximum junction temperature t amax = maximum ambient temperature q 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 [2] where: n = number of amplifiers 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, [1] & [2], equal to each other, and solve for v s , we can get a family of curves for various loads and output voltages according to [3]: figures 3 through 6 below show total single supply volt- age v s vs. r l for various output voltage swings for the pdip and soic packages. the curves assume worst case conditions of t a = +85 c and i s = 6.5 ma per amplifier. figure 1. figure 2. pd max t jmax t amax C q ja ------------------------------------------ = pd max nv s i smax v s v out C () v out r l -------------- + ? ?? = v s r l t jmax t amax C () n q ja ------------------------------------------------------------ v out () + is r l () v out + -------------------------------------------------------------------------------------- - =
14 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C el2250c single supply voltage vs r load for various v out (pdip package) figure 3. figure 4. el2250c single supply voltage vs r load for various v out (so package) figure 5. EL2450C single supply voltage vs r load for various v out (pdip package) EL2450C single supply voltage vs r load for various v out (so package) figure 6.
15 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C el2250c/EL2450C macromodel (one amplifier) * revision a, april 1996 * pin numbers reflect a standard single op amp. * connections: +input * | -input * | | +vsupply * | | | -vsupply * | | | | output .subckt el2250/el 3 2 7 4 6 * * input stage * i1 7 10 250 m a i2 7 11 250 m a r1 10 11 4k q1 12 2 10 qp q2 13 3 11 qpa r2 12 4 100 r3 13 4 100 * * second stage & compensation * gm 15 4 13 12 4.6m r4 15 4 15meg c1 15 4 0.36pf * * poles * e1 17 4 15 4 1.0 r6 17 25 400 c3 25 4 1pf r7 25 18 500 c4 18 4 1pf * * output stage * i3 20 4 1.0ma q3 7 23 20 qn q4 7 18 19 qn q5 7 18 21 qn q6 4 20 22 qp q7 7 23 18 qn d1 19 20 da r8 21 6 2 r9 22 6 2 r10 18 21 10k r11 7 23 100k d2 23 24 da d3 24 4 da d4 23 18 da * * power supply current * ips 7 4 3.2ma * * models * .model qn npn(is=800e-18 bf=150 tf=0.02ns) .model qpa pnp(is=810e-18 bf=50 tf=0.02ns) .model qp pnp(is=800e-18 bf=54 tf=0.02ns) .model da d(tt=0ns) .ends
16 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C el2250c/EL2450C macromodel (one amplifier)
17 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C
18 el2250c/EL2450C 125 mhz single supply dual/quad op amps el2250c/EL2450C general disclaimer specifications contained in this data sheet are in effect as of the publication date shown. elantec, inc. reserves the right to make changes in the cir- cuitry or specifications contained herein at any time without notice. elantec, inc. assumes no responsibility for the use of an y circuits described herein and makes no representations that they are free from patent infringement. warning - life support policy elantec, inc. products are not authorized for and should not be used within life support systems without the specific written consent of elantec, inc. life support systems are equipment intended to sup- port or sustain life and whose failure to perform when properly used in accordance with instructions provided can be reasonably expected to result in significant personal injury or death. users con- templating application of elantec, inc. products in life support systems are requested to contact elantec, inc. factory headquarters to establish suitable terms & conditions for these applications. elan- tec, inc.s warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages. elantec, inc. 1996 tarob court milpitas, ca 95035 telephone: (408) 945-1323 (800) 333-6314 fax: (408) 945-9305 european office: 44-71-482-4596 august 1998, rev b printed in u.s.a.

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