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note : all information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publi cation; 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 befor e finalization of your design documentation. ? 2001 elantec semiconductor, inc. e l 4 0 0 c general description the EL400C is a wide bandwidth, fast settling monolithic amplifier built using an advanced complementary bipolar process. this ampli- fier uses current-mode feedback to achieve more bandwidth at a given gain than conventional operational amplifiers. designed for closed- loop gains of 1 to 8, the EL400C has a 200mhz -3db bandwidth (a v = +2), and 12ns settling to 0.05% while consuming only 15ma of supply current. the EL400C is an obvious high-performance solution for video distri- bution and line-driving applications. with low 15ma supply current, differential gain/phase of 0.02%/0.01, and a minimum 50ma output drive, performance in these areas is assured. the el400's settling to 0.05% in 12ns, low distortion, and ability to drive capacitive loads make it an ideal flash a/d driver. the wide 200mhz bandwidth and extremely linear phase allow unmatched sig- nal fidelity. d/a systems can also benefit from the EL400C, especially if linearity and drive levels are important. connection diagrams dip and so package top view manufactured under u.s. patent no. 4,893,091 features ? 200mhz -3db bandwidth, a v =2 ? 12ns settling to 0.05% ? v s = 5v @ 15ma ? low distortion: hd2, hd3 @ -60dbc at 20mhz ? differential gain 0.02% at ntsc, pal ? differential phase 0.01 at ntsc, pal ? overload/short-circuit protected ? 1 to 8 closed-loop gain range ? low cost ? direct replacement for clc400 applications ? video gain block ? video distribution ? hdtv amplifier ? high-speed a/d conversion ? d/a i-v conversion ? photodiode, ccd preamps ? if processors ? high-speed communications ordering information part no. temp. range package outline # EL400Cn -40c to +85c 8-pin p-dip mdp0031 EL400Cs -40c to +85c 8-lead so mdp0027 EL400C 200mhz current feedback amplifier s e p t e m b e r 2 6 , 2 0 0 1
2 EL400C 200mhz current feedback amplifier e l 4 0 0 c absolute maximum ratings (t a = 25c) supply voltage (v s ) 7v output current output is short-circuit protected to ground, however, maximum reliability is obtained if i out does not exceed 70ma. common-mode input voltage v s differential input voltage 5v power dissipation see curves operating temperature -40c to +85c lead temperature (soldering, 5 seconds) 300c junction temperature 175c storage temperature -60c to +150c thermal resistance: q ja = 95c/w p-dip q ja = 175c/w so-8 important note: all parameters having min/max specifications are guaranteed. typ values are for information purposes only. unless otherwise note d, all tests are at the specified temperature and are pulsed tests, therefore: t j = t c = t a . open loop dc electrical characteristics v s = 5v, r l = 100 w unless otherwise specified parameter description test conditions temp min typ max unit v os input offset voltage 25c 2.0 5.5 mv t min 8.7 mv t max 9.5 mv d(v os )/dt average offset voltage drift [1] all 10.0 40.0 v/c +i in +input current 25c, t max 10.0 25.0 a t min 41.0 a d(+i in )/dt average +input current drift [1] all 50.0 200.0 na/c -i in -input current 25c 10.0 25.0 a t min 41.0 a t max 35.0 a d(-i in )/dt average -input current drift [1] all 100.0 200.0 na/c psrr power supply rejection ratio all 40.0 50.0 db cmrr common-mode rejection ratio all 40.0 50.0 db i s supply current?quiescent no load all 15.0 23.0 ma +r in +input resistance 25c, t max 100.0 200.0 k w t min 50.0 k w c in input capacitance all 0.5 2.0 pf r out output impedance (dc) all 0.1 0.2 w cmir common-mode input range [2] 25c, t max 2.0 2.1 v t min 1.2 v i out output current 25c, t max 50.0 70.0 ma t min 35.0 ma v out output voltage swing no load all 3.2 3.5 v v outl output voltage swing 100 w 25c 3.0 3.4 v r ol transimpedance 25c 30.0 125.0 v/ma t min 80.0 v/ma t max 140.0 v/ma 1. measured from t min to t max . 2. common-mode input range for rated performance.
3 EL400C 200mhz current feedback amplifier e l 4 0 0 c closed-loop ac electrical characteristics v s = 5v, r f = 250 w , a v = +2, r l = 100 w unless otherwise specified parameter description test conditions temp min typ max unit frequency response ssbw -3db bandwidth (v out < 0.5v pp ) 25c 150.0 200.0 mhz t min 150.0 mhz t max 120.0 mhz lsbw -3db bandwidth (v out < 5.0v pp ) a v = +5 all 35.0 50.0 mhz gain flatness gfpl peaking v out < 0.5v pp <40mhz 25c 0.0 0.3 db t min , t max 0.4 db gfph peaking v out < 0.5v pp >40mhz 25c 0.0 0.5 db t min , t max 0.7 db gfr rolloff v out < 0.5v pp <75mhz 25c 0.6 1.0 db t min 1.0 db t max 1.3 db lpd linear phase deviation v out < 0.5v pp <75mhz 25c, t min 0.2 1.0 t max 1.2 time-domain response t r1 , t f1 rise time, fall time 0.5v step 25c, t min 1.6 2.4 ns t max 2.9 ns t r2 , t f2 rise time, fall time 5.0v step all 6.5 10.0 ns t s1 settling time to 0.1% 2.0v step all 10.0 13.0 ns t s2 settling time to 0.05% 2.0v step all 12.0 15.0 ns os overshoot 0.5v step 25c 0.0 10.0 % t min , t max 15.0 % sr slew rate a v = +2 all 430.0 700.0 v/s a v = - 2 all 1600.0 v/s distortion hd2 2nd harmonic distortion at 20mhz 2v pp 25c -60.0 -45.0 dbc t min -40.0 dbc t max -45.0 dbc hd3 3rd harmonic distortion at 20mhz 2v pp 25c -60.0 -50.0 dbc t min , t max -50.0 dbc equivalent input noise nf noise floor >100khz [1] 25c -157.0 -154.0 dbm (1hz) t min -154.0 dbm (1hz) t max -153.0 dbm (1hz) inv integrated noise 100khz to 200mhz [1] 25c 40.0 57.0 v t min 57.0 v t max 63.0 v video performance d g differential gain [2] ntsc/pal 25c 0.02 % pp d p differential phase [2] ntsc/pal 25c 0.01 pp d g differential gain [2] 30mhz 25c 0.05 % pp d p differential phase [2] 30mhz 25c 0.05 pp vbw -0.1db bandwidth [2] 25c 60.0 mhz 1. noise tests are performed from 5mhz to 200mhz. 2. differential gain/phase tests are r l = 100 w . for other values of r l , see curves.
4 EL400C 200mhz current feedback amplifier e l 4 0 0 c typical performance curves non-inverting frequency response inverting frequency response frequency response for various r l s open-loop transimpedance gain and phase 2nd and 3rd harmonic distortion 2-tone 3rd order intermodulation intercept equivalent input noise power-supply rejection ratio common-mode rejection ratio settling time long-term settling time settling time vs load capacitance
5 EL400C 200mhz current feedback amplifier e l 4 0 0 c differential gain and phase (3.58mhz) pulse response a v = +2 pulse response a v = +2 differential gain and phase (4.43mhz) differential gain and phase (30mhz) recommended r s vs load capacitance
6 EL400C 200mhz current feedback amplifier e l 4 0 0 c equivalent circuit burn-in circuit all packages use the same schematic.
7 EL400C 200mhz current feedback amplifier e l 4 0 0 c applications information theory of operation the EL400C has a unity gain buffer from the non-invert- ing input to the inverting input. the error signal of the EL400C is a current flowing into (or out of) the inverting input. a very small change in current flowing through the inverting input will cause a large change in the output voltage. th is current amplification is called the trans- impedance (r ol ) of the EL400C [v out =(r ol )*(-i in )]. since r ol is very large, the current flowing into the inverting input in the steady-state (non-slewing) condi- tion is very small. therefore we can still use op-amp assumptions as a first- order approximation for circuit analysis, namely that: 1. the voltage across the inputs is approximately 0v. 2. the current into the inputs is approximately 0ma. resistor value selection and optimization the value of the feedback resistor (and an internal capacitor) sets the ac dynamics of the EL400C. the nominal value for the feedback resistor is 250 w , which is the value used for production testing. this value guar- antees stability. for a given closed-loop gain the bandwidth may be increased by decreasing the feedback resistor and, conversely, the bandwidth may be decreased by increasing the feedback resistor. reducing the feedback resistor too much will result in overshoot and ringing, and eventually oscillations. increasing the feedback resistor results in a lower -3db frequency. attenuation at high frequency is limited by a zero in the closed-loop transfer function which results from stray capacitance between the inverting input and ground. consequently, it is very important to keep stray capacitance to a minimum at the inverting input. differential gain/phase an industry-standard method of measuring the distor- tion of a video component is to measure the amount of differential gain and phase error it introduces. to mea- sure these, a 40 ire pp reference signal is applied to the device with 0v dc offset (0ire) at 3.58mhz for ntsc, 4.43mhz for pal, and 30mhz for hdtv. a second measurement is then made with a 0.714v dc offset (100ire). differential gain is a measure of the change in amplitude of the sine wave, and is measured in per- cent. differential phase is a measure of the change in phase, and is measured in degrees. typically, the maxi- mum positive and negative deviations are summed to give peak values. in general, a back terminated cable (75 w in series at the drive end and 75 w to ground at the receiving end) is pre- ferred since the impedance match at both ends will absorb any reflections. however, when double-termina- tion is used, the received signal is reduced by half; therefore a gain of 2 configuration is typically used to compensate for the attenuation. in a gain of 2 configura- tion, with output swing of 2v pp , with each back- terminated load at 150 w . the EL400C is capable of driving up to 4 back-terminated loads with excellent video performance. please refer to the typical curves for more information on video performance with respect to frequency, gain, and loading. capacitive feedback the EL400C relies on its feedback resistor for proper compensation. a reduction of the impedance of the feed- back element results in less stability, eventually resulting in oscillation. therefore, circuit implementa- tions which have capacitive feedback should not be used because of the capacitor's impedance reduction with fre- quency. similarly, oscillations can occur when using the technique of placing a capacitor in parallel with the feed- back resistor to compensate for shunt capacitances from the inverting input to ground. offset adjustment pin output offset voltage of the EL400C can be nulled by tying a 10k potentiometer between +v s and -v s with the slider attached to pin 1. a full-range variation of the voltage at pin 1 to 5v results in an offset voltage adjustment of at least 10mv. for best settling perfor- mance pin 1 should be bypassed to ground with a ceramic capacitor located near to the package, even if the offset voltage adjustment feature is not being used.
8 EL400C 200mhz current feedback amplifier e l 4 0 0 c printed circuit layout as with any high frequency device, good pcb layout is necessary for optimum performance. ground plane con- struction is a requirement, as is good power-supply and offset adjust bypassing close to the package. the inverting input is sensitive to stray capacitance, there- fore connections at the inverting input should be minimal, close to the package, and constructed with as little coupling the ground plane as possible. capacitance at the output node will reduce stability, eventually resulting in peaking, and finally oscillation if the capacitance is large enough. the design of the EL400C allows a larger capacitive load than comparable products, yet there are occasions when a series resistor before the capacitance may be needed. please refer to the graphs to determine the proper resistor value needed.
9 EL400C 200mhz current feedback amplifier e l 4 0 0 c EL400C macromodel * revision a. march 1992 * enhancements include psrr, cmrr, and slew rate limiting * connections: +input * | -input * | | +vsupply * | | | -vsupply * | | | | output * | | | | | .subckt m400 3 2 7 4 6 * * input stage * e1 10 0 3 0 1.0 vis 10 9 0v h2 9 12 vxx 1.0 r1 2 11 50 l1 11 12 48nh iinp 3 0 8a iinm 2 0 8a * * 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 0.1h c5 17 0 0.1pf r5 17 0 500 * * transimpedance stage * g1 0 18 17 0 1.0 rol 18 0 150k cdp 18 0 2.8pf * * output stage * q1 4 18 19 qp q2 7 18 20 qn q3 7 19 21 qn q4 4 20 22 qp r7 21 6 2 r8 22 6 2 ios1 7 19 2.5ma ios2 20 4 2.5ma * * supply current * ips 7 4 9ma * * error terms * ivos 0 23 5ma vxx 23 0 0v e4 24 0 3 0 1.0 e5 25 0 7 0 1.0
10 EL400C 200mhz current feedback amplifier e l 4 0 0 c e6 26 0 4 0 1.0 r9 24 23 3k r10 25 23 1k r11 26 23 1k * * models * .model qn npn (is=5e-15 bf=200 tf=0.5ns) .model qp pnp (is=5e-15 bf=200 tf=0.5ns) .model dclamp d(is=1e-30 ibv=0.266 bv=1.3 n=4) .ends EL400C macromodel
11 EL400C 200mhz current feedback amplifier e l 4 0 0 c 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 any 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. s e p t e m b e r 2 6 , 2 0 0 1 printed in u.s.a. elantec semiconductor, inc. 675 trade zone blvd. milpitas, ca 95035 telephone: (408) 945-1323 (888) elantec fax: (408) 945-9305 european office: +44-118-977-6020 japan technical center: +81-45-682-5820

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