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el2160c december 1995 rev b el2160c 130 mhz current feedback amplifier note: all information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a ``controlled document''. current revisions, if any, to these specifications are maintained at the factory and are available upon your request. we recommend checking the revision level before finalization of your design documentation. ? 1993 elantec, inc. features # 130 mhz 3 db bandwidth (a v ea 2) # 180 mhz 3 db bandwidth (a v ea 1) # 0.01% differential gain, r l e 500 x # 0.01 differential phase, r l e 500 x # low supply current, 8.5 ma # wide supply range, g 2v to g 15v # 80 ma output current (peak) # low cost # 1500 v/ m s slew rate # input common mode range to within 1.5v of supplies # 35 ns settling time to 0.1% applications # video amplifiers # cable drivers # rgb amplifiers # test equipment amplifiers # current to voltage converter ordering information part no. temp. range package outline y el2160cn b 40 cto a 85 c 8-pin p-dip mdp0031 el2160cs b 40 cto a 85 c 8-pin soic mdp0027 general description the el2160c is a current feedback operational amplifier with b 3 db bandwidth of 130 mhz at a gain of a 2. built using the elantec proprietary monolithic complementary bipolar process, this amplifer uses current mode feedback to achieve more band- width at a given gain than a conventional voltage feedback op- erational amplifier. the el2160c is designed to drive a double terminated 75 x coax cable to video levels. differential gain and phase are excellent when driving both loads of 500 x ( k 0.01%/ k 0.01 ) and double terminated 75 x cables (0.025%/0.1 ). the amplifier can operate on any supply voltage from 4v ( g 2v) to 33v ( g 16.5v), yet consume only 8.5 ma at any sup- ply voltage. using industry standard pinouts, the el2160c is available in 8-pin p-dip and 8-pin so packages. for dual and quad applications, please see the el2260c/el2460c datasheet. elantec's facilities comply with mil-i-45208a and offer appli- cable quality specifications. see the elantec document, qra-2: elantec's military processingemonolithic products. connection diagram el2160c so, p-dip packages 2060 1 top view
el2160c 130 mhz current feedback amplifier absolute maximum ratings (t a e 25 c) voltage between v s a and v s b a 33v voltage between a in and b in g 6v current into a in or b in 10 ma internal power dissipation see curves operating ambient temperature range b 40 cto a 85 c operating junction temperature plastic packages 150 c output current g 50 ma storage temperature range b 65 cto a 150 c important note: all parameters having min/max specifications are guaranteed. the test level column indicates the specific device testing actually performed during production and quality inspection. elantec performs most electrical tests using modern high-speed automatic test equipment, specifically the ltx77 series system. unless otherwise noted, all tests are pulsed tests, therefore t j e t c e 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 e 25 c and qa sample tested at t a e 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 e 25 c for information purposes only. open loop dc electrical characteristics v s e g 15v, r l e 150 x ,t a e 25 c unless otherwise specified parameter description conditions temp limits test level units min typ max el2160c v os input offset voltage v s e g 5v, g 15v 25 c 2 10 i mv tc v os average offset voltage full 10 v m v/ c drift (note 1) a i in a input current v s e g 5v, g 15v 25 c 0.5 5 i m a b i in b input current v s e g 5v, g 15v 25 c 5 25 i m a cmrr common mode rejection v s e g 5v, g 15v 25 c5055 ii db ratio (note 2) b icmr b input current common v s e g 5v, g 15v 25 c 0.2 5 i m a/v mode rejection (note 2) psrr power supply rejection 25 c7595 ii db ratio (note 3) b ipsr b input current power 25 c 0.2 5 i m a/v supply rejection (note 3) 2 td is 2.5in
el2160c 130 mhz current feedback amplifier open loop dc electrical characteristics e contd. v s e g 15v, r l e 150 x ,t a e 25 c unless otherwise specified parameter description conditions temp limits test level units min typ max el2160c r ol transimpedance v s e g 15v 25 c 500 2000 i k x (note 4) r l e 400 x v s e g 5v 25 c 500 1800 i k x r l e 150 x a r in a input resistance 25 c 1.5 3.0 ii m x a c in a input capacitance 25 c 2.5 v pf cmir common mode input range v s e g 15v 25 c g 13.5 v v v s e g 5v 25 c g 3.5 v v v o output voltage swing r l e 400 x , 25 c g 12 g 13.5 i v v s e g 15v r l e 150 x , 25 c g 12 v v v s e g 15v r l e 150 x , 25 c g 3.0 g 3.7 i v v s e g 5v i sc output short circuit v s e g 5v, 25 c 60 100 150 i ma current (note 5) v s e g 15v i s supply current v s e g 15v 25 c 8.5 12.0 i ma v s e g 5v 25 c 6.4 9.5 i ma 3 td is 3.4in
el2160c 130 mhz current feedback amplifier closed loop ac electrical characteristics v s e g 15v, a v ea 2, r f e 560 x ,r l e 150 x ,t a e 25 c unless otherwise noted parameter description conditions limits test level units min typ max el2160c bw b 3 db bandwidth v s e g 15v, a v ea 2 130 v mhz (note 8) v s e g 15v, a v ea 1 180 v mhz v s e g 5v, a v ea 2 100 v mhz v s e g 5v, a v ea 1 110 v mhz sr slew rate r l e 400 x 1000 1500 iv v/ m s (notes 6, 8) r f e 1k x ,r g e 110 x 1500 v v/ m s r l e 400 x t r ,t f rise time, v out e g 500mv 2.7 v ns fall time, (note 8) t pd propagation delay 3.2 v ns (note 8) os overshoot (note 8) v out e g 500 mv 0 v % t s 0.1% settling time v out e g 10v 35 v ns (note 8) a v eb 1, r l e 1k dg differential gain r l e 150 x 0.025 v % (notes 7, 8) r l e 500 x 0.006 v % dp differential phase r l e 150 x 0.1 v deg ( ) (notes 7, 8) r l e 500 x 0.005 v deg ( ) note 1: measured from t min to t max . note 2: v cm e g 10v for v s e g 15v and t a e 25 c v cm e g 3v for v s e g 5v and t a e 25 c note 3: the supplies are moved from g 2.5v to g 15v. note 4: v out e g 7v for v s e g 15v, and v out e g 2v for v s e g 5v. note 5: a heat sink is required to keep junction temperature below absolute maximum when an output is shorted. note 6: slew rate is with v out from a 10v to b 10v and measured at the 25% and 75% points. note 7: dc offset from b 0.714v through a 0.714v, ac amplitude 286 mv p-p ,f e 3.58 mhz. note 8: all ac tests are performed on a ``warmed up'' part, except for slew rate, which is pulse tested. 4 td is 3.5in
el2160c 130 mhz current feedback amplifier typical performance curves response (gain) non-inverting frequency response (phase) non-inverting frequency for various r l frequency response response (gain) inverting frequency response (phase) inverting frequency various r f and r g frequency response for voltage for a v eb 1 3 db bandwidth vs supply for a v eb 1 peaking vs supply voltage temperature for a v eb 1 3 db bandwidth vs 2060 2 5
el2160c 130 mhz current feedback amplifier typical performance curves e contd. voltage for a v ea 1 3 db bandwidth vs supply for a v ea 1 peaking vs supply voltage for a v ea 1 3 db bandwidth vs temperature voltage for a v ea 2 3 db bandwidth vs supply for a v ea 2 peaking vs supply voltage for a v ea 2 3 db bandwidth vs temperature voltage for a v ea 10 3 db bandwidth vs supply for a v ea 10 peaking vs supply voltage for a v ea 10 3 db bandwidth vs temperature 2060 3 6
el2160c 130 mhz current feedback amplifier typical performance curves e contd. for various c l frequency response for various c in b frequency response vs frequency psrr and cmrr distortion vs frequency 2nd and 3rd harmonic vs frequency transimpedance (r ol ) vs frequency voltage and current noise impedance vs frequency closed-loop output vs die temperature transimpedance (r ol ) 2060 4 7
el2160c 130 mhz current feedback amplifier typical performance curves e contd. (4 samples) vs die temperature offset voltage vs die temperature supply current vs supply voltage supply current vs die temperature a input resistance vs die temperature input current vs input voltage a input bias current vs die temperature output voltage swing vs die temperature short circuit current vs die temperature psrr & cmrr 2060 5 8
el2160c 130 mhz current feedback amplifier typical performance curves e contd. r l e 150 vs dc input voltage, differential gain r l e 150 vs dc input voltage, differential phase pulse response small signal r l e 500 vs dc input voltage, differential gain r l e 500 vs dc input voltage, differential phase pulse response large signal vs supply voltage slew rate vs temperature slew rate vs settling accuracy settling time 2060 6 9
el2160c 130 mhz current feedback amplifier typical performance curves e contd. long term settling error vs ambient temperature maximum power dissipation 8-lead plastic dip vs ambient temperature maximum power dissipation 8-lead plastic so 2060 7 burn-in circuit el2160c 2060 8 10
el2160c 130 mhz current feedback amplifier differential gain and phase test circuit 2060 9 simplified schematic (one amplifier) 2060 10 11
el2160c 130 mhz current feedback amplifier applications information product description the el2160c is a current mode feedback amplifi- er that offers wide bandwidth and good video specifications at a moderately low supply cur- rent. it is built using elantec's proprietary com- plimentary bipolar process and is offered in in- dustry standard pin-outs. due to the current feedback architecture, the el2160c closed-loop 3 db bandwidth is dependent on the value of the feedback resistor. first the desired bandwidth is selected by choosing the feedback resistor, r f , and then the gain is set by picking the gain resis- tor, r g . the curves at the beginning of the typi- cal performance curves section show the effect of varying both r f and r g . the 3 db bandwidth is somewhat dependent on the power supply volt- age. as the supply voltage is decreased, internal junction capacitances increase, causing a reduc- tion in closed loop bandwidth. to compensate for this, smaller values of feedback resistor can be used at lower supply voltages. 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 high- ly recommended. lead lengths should be as short as possible, below (/4 . the power supply pins must be well bypassed to reduce the risk of oscil- lation. a 1.0 m f tantalum capacitor in parallel with a 0.01 m f ceramic capacitor is adequate for each supply pin. for good ac performance, parasitic capacitances should be kept to a minimum, especially at the inverting input (see capacitance at the inverting input section). this implies keeping the ground plane away from this pin. carbon resistors are acceptable, while use of wire-wound resistors should not be used because of their parasitic in- ductance. similarly, capacitors should be low in- ductance for best performance. use of sockets, particularly for the so package, should be avoid- ed. sockets add parasitic inductance and capaci- tance which will result in peaking and overshoot. capacitance at the inverting input due to the topology of the current feedback am- plifier, stray capacitance at the inverting input will affect the ac and transient performance of the el2160c when operating in the non- inverting configuration. the characteristic curve of gain vs. frequency with variations of c in b emphasizes this effect. the curve illustrates how the bandwidth can be extended to beyond 200 mhz with some additional peaking with an additional 2 pf of capacitance at the v in b pin for the case of a v ea 2. higher values of capac- itance will be required to obtain similar effects at higher gains. in the inverting gain mode, added capacitance at the inverting input has little effect since this point is at a virtual ground and stray capacitance is therefore not ``seen'' by the amplifier. feedback resistor values the el2160c has been designed and specified with r f e 560 x for a v ea 2. this value of feedback resistor yields extremely flat frequency response with little to no peaking out to 130 mhz. as is the case with all current feedback amplifiers, wider bandwidth, at the expense of slight peaking, can be obtained by reducing the value of the feedback resistor. inversely, larger values of feedback resistor will cause rolloff to occur at a lower frequency. by reducing r f to 430 x , bandwidth can be extended to 170 mhz with under 1 db of peaking. further reduction of r f to 360 x increases the bandwidth to 195 mhz with about 2.5 db of peaking. see the curves in the typical performance curves section which show 3 db bandwidth and peaking vs. frequency for various feedback resistors and various supply voltages. bandwidth vs temperature whereas many amplifier's supply current and consequently 3 db bandwidth drop off at high temperature, the el2160c was designed to have little supply current variations with temperature. an immediate benefit from this is that the 3 db bandwidth does not drop off drastically with temperature. with v s e g 15v and a v ea 2, the bandwidth only varies from 150 mhz to 110 mhz over the entire die junction tempera- ture range of 0 c k t k 150 c. 12
el2160c 130 mhz current feedback amplifier applications information e contd. supply voltage range the el2160c has been designed to operate with supply voltages from g 2v to g 15v. optimum bandwidth, slew rate, and video characteristics are obtained at higher supply voltages. however, at g 2v supplies, the 3 db bandwidth at a v e a 2 is a respectable 70 mhz. the following figure is an oscilloscope plot of the el2160c at g 2v supplies, a v ea 2, r f e r g e 560 x , driving a load of 150 x , showing a clean g 600 mv signal at the output. 2060 11 if a single supply is desired, values from a 4v to a 30v can be used as long as the input common mode range is not exceeded. when using a single supply, be sure to either 1) dc bias the inputs at an appropriate common mode voltage and ac couple the signal, or 2) ensure the driving signal is within the common mode range of the el2160c. settling characteristics the el2160c offers superb settling characteris- tics to 0.1%, typically in the 35 ns to 40 ns range. there are no aberrations created from the input stage which often cause longer settling times in other current feedback amplifiers. the el2160c is not slew rate limited, therefore any size step up to g 10v gives approximately the same settling time. as can be seen from the long term settling er- ror curve, for a v ea 1, there is approximately a 0.035% residual which tails away to 0.01% in about 40 m s. this is a thermal settling error caused by a power dissipation differential (before and after the voltage step). for a v eb 1, due to the inverting mode configuration, this tail does not appear since the input stage does not experi- ence the large voltage change as in the non- inverting mode. with a v eb 1, 0.01% settling time is slightly greater than 100 ns. power dissipation the el2160c amplifier combines both high speed and large output current drive capability at a moderate supply current in very small pack- ages. it is possible to exceed the maximum junc- tion temperature allowed under certain supply voltage, temperature, and loading conditions. to ensure that the el2160c remains within its abso- lute maximum ratings, the following discussion will help to avoid exceeding the maximum junc- tion temperature. the maximum power dissipation allowed in a package is determined by its thermal resistance and the amount of temperature rise according to p dmax e t jmax b t amax i ja the maximum power dissipation actually pro- duced by an ic is the total quiescent supply cur- rent times the total power supply voltage plus the power in the ic due to the load, or p dmax e 2 * v s * i s a (v s b v out ) * v out r l where i s is the supply current. (to be more accu- rate, the quiescent supply current flowing in the output driver transistor should be subtracted from the first term because, under loading and due to the class ab nature of the output stage, the output driver current is now included in the second term.) in general, an amplifier's ac performance de- grades at higher operating temperature and lower supply current. unlike some amplifiers, the el2160c maintains almost constant supply 13
el2160c 130 mhz current feedback amplifier applications information e contd. current over temperature so that ac perform- ance is not degraded as much over the entire op- erating temperature range. of course, this in- crease in performance doesn't come for free. since the current has increased, supply voltages must be limited so that maximum power ratings are not exceeded. the el2160c consumes typically 8.5 ma and maximum 11.0 ma. the worst case power in an ic occurs when the output voltage is at half sup- ply, if it can go that far, or its maximum values if it cannot reach half supply. if we set the two p dmax equations equal to each other, and solve for v s , we can get a family of curves for various loads and output voltages according to: v s e r l * (t jmax b t amax ) i ja a (v out ) 2 (2 * i s * r l ) a v out the following curves show supply voltage ( g v s ) vs r load for various output voltage swings for the 2 different packages. the curves assume worst case conditions of t a ea 85 c and i s e 11 ma. various v out (so package) supply voltage vs r load for 2060 12 supply voltage vs r load for various v out (pdip package) 2060 13 the curves do not include heat removal or forc- ing air, or the simple fact that the package will probably be attached to a circuit board, which can also provide some form of heat removal. larger temperature and voltage ranges are possi- ble with heat removal and forcing air past the part. current limit the el2160c has an internal current limit that protects the circuit in the event of the output be- ing shorted to ground. this limit is set at 100 ma nominally and reduces with junction tempera- ture. at a junction temperature of 150 c, the cur- rent limits at about 65 ma. if the output is short- ed to ground, the power dissipation could be well over 1w. heat removal is required in order for the el2160c to survive an indefinite short. driving cables and capacitive loads when used as a cable driver, double termination is always recommended for reflection-free per- formance. for those applications, the back termi- nation series resistor will decouple the el2160c from the capacitive cable and allow extensive ca- pacitive drive. however, other applications may have high capacitive loads without termination resistors. in these applications, an additional small value (5 x 50 x ) resistor in series with the output will eliminate most peaking. the gain re- sistor, r g , can be chosen to make up for the gain loss created by this additional series resistor at the output. 14
el2160c 130 mhz current feedback amplifier el2160c macromodel * revision a, november 1993 * ac characteristics used c in b (pin 2) e 1 pf; r f e 560 x * connections: a input * l b input * ll a vsupply * lll b vsupply * llll output * lllll .subckt el2160c/el 3 2 7 4 6 * * input stage * e1100301.0 vis 10 9 0v h2 9 12 vxx 1.0 r1211130 l1 11 12 25nh iinp 3 0 0.5 m a iinm205 m a r12 3 0 2meg * * slew rate limiting * h1 13 0 vis 600 r2 13 14 1k d1 14 0 dclamp d2 0 14 dclamp * * high frequency pole * * e2 30 0 14 0 0.00166666666 l3 30 17 0.43 m h c5 17 0 0.27pf r5 17 0 500 * * transimpedance stage * g10181701.0 ro1 18 0 2meg cdp 18 0 2.285pf * * output stage * q141819qp q271820qn q371921qn q442022qp r7 21 6 4 r8 22 6 4 ios1 7 19 2ma ios2 20 4 2ma * * supply current * ips 7 4 3ma * * error terms * ivos 0 23 2ma vxx 23 0 0v e4240301.0 e5250701.0 e6260401.0 r9 24 23 562 r10 25 23 1k r11 26 23 1k * * models * .model qn npn (is e 5e b 15 bf e 100 tf e 0.1ns) .model qp pnp (is e 5e b 15 bf e 100 tf e 0.1ns) .model dclamp d (is e 1e b 30 ibv e 0.266 bv e 2.24 n e 4) .ends 15 tab wide td is 6.5in td is 2.6in
el2160c december 1995 rev b el2160c 130 mhz current feedback amplifier el2160c macromodel e contd. 2060 14 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 circuitry or specifications contained herein at any time without notice. elantec, inc. assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. 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 warning e 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 in- tended to support 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 contemplating 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. elantec, inc.'s warranty is limited to replace- ment of defective components and does not cover injury to per- sons or property or other consequential damages. printed in u.s.a. 16

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