View EL4431CN_6106720.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

el4430c/el4431c january 1996 rev. d el4430c/el4431c video instrumentation amplifiers 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. ? 1996 elantec, inc. features # fully differential inputs and feedback e differential input range of g 2v e common-mode range of g 12v e high cmrr at 4 mhz of 70 db e stable at gains of 1, 2 # calibrated and clean input clipping # 4430e80 mhz @ g e 1 # 4431e160 mhz gbwp # 380v/ m s slew rate # 0.02% or differential gain or phase # operates on g 5to g 15v supplies with no ac degradation applications # line receivers # ``loop-through'' interface # level translation # magnetic head pre-amplification # differential-to-single-ended conversion ordering information part no. temp. range package outline y el4430cn b 40 cto a 85 c 8-pin p-dip mdp0031 el4430cs b 40 cto a 85 c 8-lead so mdp0027 EL4431CN b 40 cto a 85 c 8-pin p-dip mdp0031 el4431cs b 40 cto a 85 c 8-lead so mdp0027 general description the el4430 and 4431 are video instrumentation amplifiers which are ideal for line receivers, differential-to-single-ended converters, transducer interfacing, and any situation where a differential signal must be extracted from a background of com- mon-mode noise or dc offset. these devices have two differential signal inputs and two differ- ential feedback terminals. the fb terminal connects to the am- plifier output, or a divided version of it to increase circuit gain, and the ref terminal is connected to the output ground or offset reference. the el4430 is compensated to be stable at a gain of 1 or more, and the el4431 for a gain of 2 or more. the amplifiers have an operational temperature of b 40 cto a 85 c and are packaged in plastic 8-pin dip and so-8. the el4430 and el4431 are fabricated with elantec's proprie- tary complementary bipolar process which gives excellent sig- nal symmetry and is free from latchup. connection diagram 4430 1
el4430c/el4431c video instrumentation amplifiers absolute maximum ratings (t a e 25 c) v a positive supply voltage 16.5v v s v a to v b supply voltage 33v v in voltage at any input or feedback v a to v b d v in difference between pairs of inputs or feedback 6v i in current into any input, or feedback pin 4 ma i out continuous output current 30 ma p d maximum power dissipation see curves t a operating temperature range b 40 cto a 85 c t s storage temperature range b 60 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 power supplies at g 5v, t a e 25 . for the el4431, r f e r g e 500 x . parameter description min typ max test units level v diff differential input voltage - clipping el4430/31 2.0 2.3 i v (v cm e 0) 0.1% nonlinearity el4430/31 1.8 v v v cm common-mode range (v diff e 0) v s e g 5v g 2 g 3.0 i v v s e g 15v g 12 g 13.0 i v v os input offset voltage el4430/31 2 8 i mv i b input bias current (in a ,in b , ref, and fb terminals) 12 20 i m a i os input offset current between in a and in b 0.2 2 i m a and between ref and fb r in input resistance el4430/31 100 230 i k x cmrr common-mode rejection ratio 70 90 i db psrr power supply rejection ratio el4430/31 60 v db e g gain error, excluding feedback resistors el4430/31 b 1.5 b 0.2 a 0.5 i % v o output voltage swing el4430, v s e g 5v g 2 g 2.8 i v v s e g 15v g 12 g 12.8 i v el4431, v s e g 5v g 2.5 g 3.0 i v v s e g 15v g 12.5 g 13.0 i v i sc output short-circuit current 40 90 i ma i s supply current, v s e g 15v 13.5 16 i ma 2 td is 3.5in
el4430c/el4431c video instrumentation amplifiers closed-loop ac electrical characteristics power supplies at g 12v, t a e 25 c, r l e 500 x for the el4430, r l e 150 x for the el4431, c l e 15 pf. for the el4431, r f e r g e 500 x . parameter description min typ max test units level bw, b 3db b 3 db small-signal bandwidth el4430 82 v mhz el4431 80 v mhz bw, g 0.1 db 0.1 db flatness bandwidth el4430 20 v mhz el4431 14 v mhz peaking frequency response peaking el4430 0.6 v db el4431 1.0 v db sr slew rate, v out between b 2v and a 2v all 380 v v/ m s v n input-referred noise voltage density el4430/31 26 v nv/rt-hz dg differential gain error, voffset between el4430 0.02 v % b 0.7v and a 0.7v el4431, r l e 150 x 0.04 v % d i differential gain error, voffset between el4430 0.02 v ( ) b 0.7v and a 0.7v el4431, r l e 150 x 0.08 v ( ) t s settling time, to 0.1% from a 4v step el4430 48 v ns test circuit 4430 3 typical performance curves el4430 and el4431 common-mode rejection ratio vs frequency 4430 4 3 td is 2.5in
el4430c/el4431c video instrumentation amplifiers typical performance curves e contd. el4430 frequency response vs gain 4430 5 el4430 frequency response for various r l ,c l v s e g 5v 4430 6 el4430 frequency response for various r l ,c l v s e g 15v 4430 7 el4431 frequency response vs gain 4430 8 el4431 frequency response for various r l ,c l v s e g 5v 4430 9 el4431 frequency response for various r l ,c l v s e g 15v 4430 10 4
el4430c/el4431c video instrumentation amplifiers typical performance curves e contd. el4430 differential gain and phase vs input offset voltage for v s e g 5v 4430 14 el4430 differential gain and phase vs input offset voltage for v s e g 12v 4430 15 el4430 differential gain and phase error vs r l 4430 16 el4431 differential gain and phase vs input offset voltage for v s e g 5v 4430 17 el4431 differential gain and phase vs input offset voltage for v s e g 12v 4430 18 el4431 differential gain and phase error vs r l 4430 19 el4430 nonlinearity vs input signal span 4430 20 el4431 nonlinearity vs input signal span 4430 21 5
el4430c/el4431c video instrumentation amplifiers typical performance curves e contd. el4430 b 3 db bandwidth and peaking vs supply voltage for a v ea 1 4430 23 el4430 b 3 db bandwidth and peaking vs die temperature for a v ea 1 4430 24 el4430 gain, b 3 db bandwidth and peaking vs load resistance for a v ea 1 4430 25 el4431 b 3 db bandwidth and peaking vs supply voltage 4430 26 el4431 b 3 db bandwidth and peaking vs die temperature for a v ea 2 4430 27 el4431 gain, b 3 db bandwidth and peaking vs load resistance for a v ea 2 4430 28 6
el4430c/el4431c video instrumentation amplifiers typical performance curves e contd. slew rate vs supply voltage 4430 32 slew rate vs die temperature 4430 33 input voltage and current noise vs frequency 4430 34 common mode input range vs supply voltage 4430 35 offset voltage vs die temperature 4430 36 bias current vs die temperature 4430 37 supply current vs supply voltage 4430 38 supply current vs die temperature 4430 39 power dissipation vs ambient temperature 4430 40 7
el4430c/el4431c video instrumentation amplifiers applications information the el4430 and el4431 are designed to convert a fully differential input to a single-ended output. it has two sets of inputs; one which is connected to the signal and does not respond to its com- mon-mode level, and another which is used to complete a feedback loop with the output. here is a typical connection: 4430 2 the gain of the feedback divider is h. the trans- fer function of the part is v out e a o c ((v in a ) b (v in b ) a (v ref b v fb )). v fb is connected to v out through a feedback network, so v fb e h c v out .a o is the open- loop gain of the amplifier, and is about 600 for the el4430 and el4431. the large value of a o drives (v in a ) b (v in b ) a (v ref b v fb ) x 0. rearranging and substituting for v fb v out e ((v in a ) b (v in b ) a v ref )/h. thus, the output is equal to the difference of the v in 's and offset by v ref , all gained up by the feedback divider ratio. the input impedance of the fb terminal (equal to r in of the input termi- nals) is in parallel with an r g , and raises circuit gain slightly. the el4430 is stable for a gain of 1 (a direct connection between v out and fb) or more and the el4431 for gains of 2 or more. it is important to keep the feedback divider's impedance at the fb terminal low so that stray capacitance does not diminish the loop's phase margin. the pole caused by the parallel of resistors r f and r g and stray capacitance should be at least 200 mhz; typical strays of 3 pf thus require a feedback im- pedance of 270 x or less. two 510 x resistors are acceptable for a gain of 2; 300 x and 2700 x make a good gain-of-10 divider. alternatively, a small capacitor across r f can be used to create more of a frequency-compensated divider. the value of the capacitor should scale with the parasitic ca- pacitance at the fb terminal input. it is also practical to place small capacitors across both the feedback resistors (whose values maintain the de- sired gain) to swamp out parasitics. for instance, two 10 pf capacitors (for a gain of 2) across equal divider resistors will dominate parasitic effects and allow a higher divider resistance. input connections the input transistors can be driven from resistive and capacitive sources, but are capable of oscilla- tion when presented with an inductive input. it takes about 80nh of series inductance to make the inputs actually oscillate, equivalent to 4 of unshielded wiring or about 6 of unterminated input transmission line. the oscillation has a characteristic frequency of 500 mhz. often, plac- ing one's finger (via a metal probe) or an oscillo- scope probe on the input will kill the oscillation. normal high-frequency construction obviates any such problems, where the input source is rea- sonably close to the input. if this is not possible, one can insert series resistors of approximately 51 x to de-q the inputs. signal amplitudes signal input common-mode voltage must be be- tween (v b ) a 3v and (v a ) b 3v to ensure linear- ity. additionally, the differential voltage on any input stage must be limited to g 6v to prevent damage. the differential signal range is g 2v in the el4430 and el4431. the input range is sub- stantially constant with temperature. the ground pin the ground pin draws only 6 m a maximum dc current, and may be biased anywhere between (v b ) a 2.5v and (v a ) b 3.5v. the ground pin is connected to the ic's substrate and frequency compensation components. it serves as a shield within the ic and enhances cmrr over frequen- cy, and if connected to a potential other than ground, it must be bypassed. 8
el4430c/el4431c video instrumentation amplifiers applications information e contd. power supplies the instrumentation amplifiers work well on any supplies from g 3v to g 15. the supplies may be of different voltages as long as the requirements of the gnd pin are observed ( see the ground pin section for a discussion). the supplies should be bypassed close to the device with short leads. 4.7 m f tantalum capacitors are very good, and no smaller bypasses need be placed in parallel. ca- pacitors as low as 0.01 m f can be used if small load currents flow. single-polarity supplies, such as a 12v with a 5v can be used, where the ground pin is con- nected to a 5v and v- to ground. the inputs and outputs will have to have their levels shifted above ground to accommodate the lack of nega- tive supply. the dissipation of the amplifiers increases with power supply voltage, and this must be compati- ble with the package chosen. this is a close esti- mate for the dissipation of a circuit: p d e 2 c v s c i s , max a (v s b v o ) c v o /r par where i s , max is the maximum supply current v s is the g supply voltage (assumed equal) v o is the output voltage r par is the parallel of all resistors loading the output for instance, the el4431 draws a maximum of 16 ma and we might require a 2v peak output into 150 x and a 270 x a 270 x feedback divider. the r par is 117 x . the dissipation with g 5v supplies is 201 mw. the maximum supply volt- age that the device can run on for a given p d and the other parameter is v s , max e (p d a v o 2/r par )/ (2i s a v o /r par ) the maximum dissipation a package can offer is p d , max e (t j , max b t a max)/ i ja where t j , max is the maximum die junction temperature, 150 c for reliability, less to retain optimum electrical performance. t a , max is the ambient temperature, 70 c for commercial and 85 c for industrial range. i ja is the thermal resistance of the mounted package, obtained from data- sheet dissipation curves. the more difficult case is the so-8 package. with a maximum die temperature of 150 c and a maxi- mum ambient temperature of 85 c, the 65 c tem- perature rise and package thermal resistance of 170 c/w gives a dissipation of 382 mw at 85 c. this allows a maximum supply voltage of g 8.5v for the el4431 operated in our example. if an el4430 were driving a light load (r par x % ), it could operate on g 15v supplies at a 70 c max- imum ambient. output loading the output stage of the instrumentation amplifi- ers is very powerful. it typically can source 80 ma and sink 120 ma. of course, this is too much current to sustain and the part will eventu- ally be destroyed by excessive dissipation or by metal traces on the die opening. the metal traces are completely reliable while delivering the 30 ma continuous output given in the absolute maximum ratings table in this datasheet, or higher purely transient currents. gain or gain accuracy degrades only 10% from no load to 100 x load. heavy resistive loading will degrade frequency response and video distortion for loads k 100 x capacitive loads will cause peaking in the fre- quency response. if capacitive loads must be driv- en, a small-valued series resistor can be used to isolate it (12 x to 51 x should suffice). a 22 x se- ries resistor will limit peaking to 2.5 db with even a 220 pf load. 9
el4430c/el4431c video instrumentation amplifiers * macromodel * this is a pspice-compatible macromodel of the el4430 video instrumentation * amplifier assembled as a subcircuit. the pins are numbered sequentially * as the subcircuit interface nodes. t1 is a transmission line which provides * a good emulation of the more complicated real device. this model correctly * displays the characteristics of input clipping, frequency response, cmrr * both ac and dc, output clipping, output sensitivity to capacitive loads, * gain accuracy, slewrate limiting, input bias current and impedance. the * macromodel does not exhibit proper results with respect to supply current, * supply sensitivities, offsets, output current limit, differential gain or * phase, nor temperature. * connections: in a l vin b ll v b lll v a llll vfb lllll vref llllll vout llllll l gnd llllll ll .subckt el4430/el 3 4 2 7 6 5 8 1 *** *** el4430 macromodel *** *** ****** i1 7 10 .00103 i2 7 11 .00103 i3 7 12 .00105 i4 7 13 .00105 v17143 v27153 v3 19 2 3 ****** c1 11 1 .03p c2 12 1 .03p c3 18 1 2.1p c4 16 17 0.6p ****** r1 10 11 2000 r2 12 13 2000 r3 10 1 30e6 r4 16 2 1000 r5 17 2 1000 r6 18 1 1.27e6 r7 23 21 20 r8 21 8 100 ****** 11 21 8 50n ****** d1 11 14 diode d2 12 14 diode d3 18 15 diode d4 19 18 diode .model diode d(tt e 120n) ****** q1 16 3 10 1 pnp q2 17 4 11 1 pnp q3 16 5 12 1 pnp q4 17 6 13 1 pnp .model pnp pnp (bf e 90 va e 44 tr e 50n) ****** g1 18 1 17 16 .0005 e12011181.0 t1221201z0 e 50 td e 1.5n r1t1 22 1 50 e2 23 1 22 1 1.0 ****** .ends 10 td is 7.0in
el4430c/el4431c video instrumentation amplifiers el4430c/el4431c macromodel e contd. 4430 41 11
el4430c/el4431c january 1996 rev. d el4430c/el4431c video instrumentation amplifiers 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. 12

▲Up To Search▲

Price & Availability of EL4431CN

	To Download EL4431CN Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .