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el2045c december 1995 rev c el2045c low-power 100 mhz gain-of-2 stable operational 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. ? 1992 elantec, inc. features # 100 mhz gain-bandwidth product # gain-of-2 stable # low supply current e 5.2 ma at v s e g 15v # wide supply range e g 2v to g 18v dual-supply e 2.5v to 36v single-supply # high slew rate e 275 v/ m s # fast settling e 80 ns to 0.1% for a 10v step # low differential gain e 0.02% at a v ea 2, r l e 150 x # low differential phase e 0.07 at a v ea 2, r l e 150 x # stable with unlimited capacitive load # wide output voltage swing e g 13.6v with v s e g 15v, r l e 1000 x e 3.8v/0.3v with v s ea 5v, r l e 500 x applications # video amplifier # single-supply amplifier # active filters/integrators # high-speed sample-and-hold # high-speed signal processing # adc/dac buffer # pulse/rf amplifier # pin diode receiver # log amplifier # photo multiplier amplifier # difference amplifier ordering information part no. temp. range package outline y el2045cn 0 cto a 75 c 8-pin p-dip mdp0031 EL2045CS 0 cto a 75 c 8-lead so mdp0027 general description the el2045c is a high speed, low power, low cost monolithic operational amplifier built on elantec's proprietary comple- mentary bipolar process. the el2045c is gain-of-2 stable and features a 275 v/ m s slew rate and 100 mhz gain-bandwidth product while requiring only 5.2 ma of supply current. the power supply operating range of the el2045c is from g 18v down to as little as g 2v. for single-supply operation, the el2045c operates from 36v down to as little as 2.5v. the excellent power supply operating range of the el2045c makes it an obvious choice for applications on a single a 5v or a 3v supply. the el2045c also features an extremely wide output voltage swing of g 13.6v with v s e g 15v and r l e 1000 x .at g 5v, output voltage swing is a wide g 3.8v with r l e 500 x and g 3.2v with r l e 150 x . furthermore, for single-supply opera- tion at a 5v, output voltage swing is an excellent 0.3v to 3.8v with r l e 500 x . at a gain of a 2, the el2045c has a b 3 db bandwidth of 100 mhz with a phase margin of 50 . it can drive unlimited load capacitance, and because of its conventional voltage-feed- back topology, the el2045c allows the use of reactive or non- linear elements in its feedback network. this versatility com- bined with low cost and 75 ma of output-current drive makes the el2045c an ideal choice for price-sensitive applications re- quiring low power and high speed. connection diagram dip and so package 2045 1
el2045c low-power 100 mhz gain-of-2 stable operational amplifier absolute maximum ratings (t a e 25 c) supply voltage (v s ) g 18v or 36v peak output current (i op ) short-circuit protected output short-circuit duration infinite (note 1) input voltage (v in) g v s differential input voltage (dv in ) g 10v power dissipation (p d ) see curves operating temperature range (t a )0 cto a 75 c operating junction temperature (t j ) 150 c storage temperature (t st ) 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. dc electrical characteristics v s e g 15v, r l e 1000 x , unless otherwise specified parameter description condition temp min typ max test level units v os input offset v s e g 15v 25 c 0.5 7.0 i mv voltage t min ,t max 9.0 iii mv tcv os average offset (note 2) all 10.0 v m v/ c voltage drift i b input bias v s e g 15v 25 c 2.8 8.2 i m a current t min ,t max 9.2 iii m a v s e g 5v 25 c 2.8 v m a i os input offset v s e g 15v 25 c 50 300 i na current t min ,t max 400 iii na v s e g 5v 25 c50 vna tci os average offset (note 2) all 0.3 v na/ c current drift a vol open-loop gain v s e g 15v,v out e g 10v, r l e 1000 x 25 c 1500 3000 i v/v t min ,t max 1500 iii v/v v s e g 5v, v out e g 2.5v, r l e 500 x 25 c 2500 v v/v v s e g 5v, v out e g 2.5v, r l e 150 x 25 c 1750 v v/v psrr power supply v s e g 5v to g 15v 25 c6585 i db rejection ratio t min ,t max 60 iii db 2 td is 3.5in
el2045c low-power 100 mhz gain-of-2 stable operational amplifier dc electrical characteristics v s e g 15v, r l e 1000 x , unless otherwise specified e contd. parameter description condition temp min typ max test level units cmrr common-mode v cm e g 12v, v out e 0v 25 c7095 i db rejection ratio t min ,t max 70 iii db cmir common-mode v s e g 15v 25 c g 14.0 v v input range v s e g 5v 25 c g 4.2 v v v s ea 5v 25 c 4.2/0.1 v v v out output voltage v s e g 15v, r l e 1000 x 25 c g 13.4 g 13.6 i v swing t min ,t max g 13.1 iii v v s e g 15v, r l e 500 x 25 c g 12.0 g 13.4 i v v s e g 5v, r l e 500 x 25 c g 3.4 g 3.8 iv v v s e g 5v, r l e 150 x 25 c g 3.2 v v v s ea 5v, r l e 500 x 25 c 3.6/0.4 3.8/0.3 i v t min ,t max 3.5/0.5 iii v i sc output short 25 c4075 ima circuit current t min ,t max 35 iii ma i s supply current v s e g 15v, no load 25 c 5.2 7 i ma t min ,t max 7.6 iii ma v s e g 5v, no load 25 c 5.0 v ma r in input resistance differential 25 c 150 v k x common-mode 25 c15vm x c in input capacitance a v ea 2 @ 10 mhz 25 c 1.0 v pf r out output resistance a v ea 225 c50vm x psor power-supply dual-supply 25 c g 2.0 g 18.0 v v operating range single-supply 25 c 2.5 36.0 v v closed-loop ac electrical characteristics v s e g 15v, a v ea 2, r f e r g e 1k x ,c f e 3 pf, r l e 1000 x unless otherwise specified parameter description condition temp min typ max test level units bw b 3 db bandwidth v s e g 15v, a v ea 225 c 100 v mhz (v out e 0.4 v pp ) v s e g 15v, a v eb 125 c 75 v mhz v s e g 15v, a v ea 525 c 20 v mhz v s e g 15v, a v ea 10 25 c 10 v mhz v s e g 15v, a v ea 20 25 c 5 v mhz v s e g 5v, a v ea 225 c 75 v mhz gbwp gain-bandwidth product v s e g 15v 25 c 100 v mhz v s e g 5v 25 c 75 v mhz pm phase margin r l e 1k x ,c l e 10 pf 25 c50 v 3 td is 4.5in td is 1.9in
el2045c low-power 100 mhz gain-of-2 stable operational amplifier closed-loop ac electrical characteristics v s e g 15v, a v ea 2, r f e r g e 1k x ,c f e 3 pf, r l e 1000 x , unless otherwise specified e contd. parameter description condition temp min typ max test level units sr slew rate (note 3) v s e g 15v, r l e 1000 x 25 c 200 275 i v/ m s v s e g 5v, r l e 500 x 25 c 200 v v/ m s fpbw full-power bandwidth v s e g 15v 25 c 3.2 4.4 i mhz (note 4) v s e g 5v 25 c 12.7 v mhz t r ,t f rise time, fall time 0.1v output step 25 c 3.0 v ns os overshoot 0.1v output step 25 c20 v% t pd propagation delay 25 c 2.5 v ns t s settling to a 0.1% v s e g 15v, 10v step 25 c80 vns (a v ea 2) v s e g 5v, 5v step 25 c60 vns dg differential gain (note 5) ntsc/pal 25 c 0.02 v % dp differential phase (note 5) ntsc/pal 25 c 0.07 v en input noise voltage 10 khz 25 c 15.0 v nv/ 0 hz in input noise current 10 khz 25 c 1.50 v pa/ 0 hz ci stab load capacitance stability a v ea 225 c infinite v pf note 1: a heat-sink is required to keep junction temperature below absolute maximum when an output is shorted. note 2: measured from t min to t max . note 3: slew rate is measured on rising edge. note 4: for v s e g 15v, v out e 20 v pp . for v s e g 5v, v out e 5v pp . full-power bandwidth is based on slew rate measurement using: fpbw e sr/(2 q * vpeak). note 5: video performance measured at v s e g 15v, a v ea 2 with 2 times normal video level across r l e 150 x . this corresponds to standard video levels across a back-terminated 75 x load. for other values of r l , see curves. el2045c test circuit 2045 2 4 td is 2.8in
el2045c low-power 100 mhz gain-of-2 stable operational amplifier typical performance curves (t a e 25 c, r f e 1k x ,c f e 3 pf, r l e 1000 x ,a v ea 2 unless otherwise specified) frequency response non-inverting inverting frequency response various load resistances frequency response for phase vs frequency open-loop gain and vs frequency output voltage swing equivalent input noise output resistance vs frequency cmrr, psrr and closed-loop distortion vs frequency 2nd and 3rd harmonic output voltage change settling time vs supply voltage supply current vs vs supply voltage common-mode input range vs supply voltage output voltage range 2045 3 5
el2045c low-power 100 mhz gain-of-2 stable operational amplifier typical performance curves (t a e 25 c, r f e 1k x ,c f e 3 pf, r l e 1000 x ,a v ea 2 unless otherwise specified) e contd. vs supply voltage gain-bandwidth product vs supply voltage open-loop gain supply voltage slew-rate vs vs input common-mode voltage bias and offset current vs load resistance open-loop gain vs load resistance voltage swing vs temperature offset voltage current vs temperature bias and offset vs temperature supply current vs temperature gain-bandwidth product and cmrr vs temperature open-loop gain psrr temperature slew rate vs 2045 4 6
el2045c low-power 100 mhz gain-of-2 stable operational amplifier typical performance curves (t a e 25 c, r f e 1k x ,c f e 3 pf, r l e 1000 x ,a v ea 2 unless otherwise specified) e contd. short-circuit current vs temperature gain-bandwidth product vs load capacitance overshoot vs load capacitance 2045 5 small-signal step response 2045 6 large-signal step response 2045 7 offset at 3.58 mhz phase vs dc input differential gain and offset at 4.43 mhz phase vs dc input differential gain and 150 x loads at 3.58 mhz phase vs number of differential gain and 150 x loads at 4.43 mhz phase vs number of differential gain and vs ambient temperature maximum power dissipation 8-pin plastic dip vs ambient temperature maximum power dissipation 8-lead so 2045 8 7
el2045c low-power 100 mhz gain-of-2 stable operational amplifier simplified schematic 2045 9 8
el2045c low-power 100 mhz gain-of-2 stable operational amplifier burn-in circuit 2045 10 all packages use the same schematic applications information product description the el2045c is a low-power wideband, gain-of-2 stable monolithic operational amplifier built on elantec's proprietary high-speed complementary bipolar process. the el2045c uses a classical voltage-feedback topology which allows it to be used in a variety of applications where current- feedback amplifiers are not appropriate because of restrictions placed upon the feedback element used with the amplifier. the conventional topolo- gy of the el2045c allows, for example, a capaci- tor to be placed in the feedback path, making it an excellent choice for applications such as active filters, sample-and-holds, or integrators. similar- ly, because of the ability to use diodes in the feed- back network, the el2045c is an excellent choice for applications such as fast log amplifiers. single-supply operation the el2045c has been designed to have a wide input and output voltage range. this design also makes the el2045c an excellent choice for sin- gle-supply operation. using a single positive sup- ply, the lower input voltage range is within 100 mv of ground (r l e 500 x ), and the lower output voltage range is within 300 mv of ground. upper input voltage range reaches 4.2v, and out- put voltage range reaches 3.8v with a 5v supply and r l e 500 x . this results in a 3.5v output swing on a single 5v supply. this wide output voltage range also allows single-supply operation with a supply voltage as high as 36v or as low as 2.5v. on a single 2.5v supply, the el2045c still has 1v of output swing. gain-bandwidth product and the b 3db bandwidth the el2045c has a gain-bandwidth product of 100 mhz while using only 5.2 ma of supply cur- rent. for gains greater than 4, its closed-loop b 3 db bandwidth is approximately equal to the gain-bandwidth product divided by the noise gain of the circuit. for gains less than 4, higher- order poles in the amplifier's transfer function contribute to even higher closed loop band- widths. for example, the el2045c has a b 3db bandwidth of 100 mhz at a gain of a 2, dropping to 20 mhz at a gain of a 5. it is important to note that the el2045c has been designed so that this ``extra'' bandwidth in low-gain applications does not come at the expense of stability. as seen in the typical performance curves, the el2045c in a gain of a 2 only exhibits 1.0 db of peaking with a 1000 x load. video performance an industry-standard method of measuring the video distortion of a component such as the el2045c is to measure the amount of differential gain (dg) and differential phase (dp) that it in- troduces. to make these measurements, a 0.286 v pp (40 ire) signal is applied to the device with 0v dc offset (0 ire) at either 3.58 mhz for ntsc or 4.43 mhz for pal. a second measure- ment is then made at 0.714v dc offset (100 ire). differential gain is a measure of the change in amplitude of the sine wave, and is mea- sured in percent. differential phase is a measure of the change in phase, and is measured in de- grees. for signal transmission and distribution, a back- terminated cable (75 x in series at the drive end, and 75 x to ground at the receiving end) is pre- ferred since the impedance match at both ends will absorb any reflections. however, when dou- ble termination is used, the received signal is halved; therefore a gain of 2 configuration is typi- cally used to compensate for the attenuation. the el2045c has been designed as an economi- cal solution for applications requiring low video distortion. it has been thoroughly characterized 9
el2045c low-power 100 mhz gain-of-2 stable operational amplifier applications information e contd. for video performance in the topology described above, and the results have been included as typi- cal dg and dp specifications and as typical per- formance curves. in a gain of a 2, driving 150 x , with standard video test levels at the input, the el2045c exhibits dg and dp of only 0.02% and 0.07 at ntsc and pal. because dg and dp can vary with different dc offsets, the video per- formance of the el2045c has been characterized over the entire dc offset range from b 0.714v to a 0.714v. for more information, refer to the curves of dg and dp vs dc input offset. the output drive capability of the el2045c al- lows it to drive up to 2 back-terminated loads with good video performance. for more demand- ing applications such as greater output drive or better video distortion, a number of alternatives such as the el2120, el400, or el2074 should be considered. output drive capability the el2045c has been designed to drive low im- pedance loads. it can easily drive 6 v pp into a 150 x load. this high output drive capability makes the el2045c an ideal choice for rf, if and video applications. furthermore, the current drive of the el2045c remains a minimum of 35 ma at low temperatures. the el2045c is cur- rent-limited at the output, allowing it to with- stand shorts to ground. however, power dissipa- tion with the output shorted can be in excess of the power-dissipation capabilities of the package. capacitive loads for ease of use, the el2045c has been designed to drive any capacitive load. however, the el2045c remains stable by automatically reduc- ing its gain-bandwidth product as capacitive load increases. therefore, for maximum bandwidth, capacitive loads should be reduced as much as possible or isolated via a series output resistor (rs). similarly, coax lines can be driven, but best ac performance is obtained when they are termi- nated with their characteristic impedance so that the capacitance of the coaxial cable will not add to the capacitive load seen by the amplifier. al- though stable with all capacitive loads, some peaking still occurs as load capacitance increases. a series resistor at the output of the el2045c can be used to reduce this peaking and further improve stability. printed-circuit layout the el2045c is well behaved, and easy to apply in most applications. however, a few simple tech- niques will help assure rapid, high quality results. as with any high-frequency device, good pcb layout is necessary for optimum performance. ground-plane construction is highly recommend- ed, as is good power supply bypassing. a 0.1 m f ceramic capacitor is recommended for bypassing both supplies. lead lengths should be as short as possible, and bypass capacitors should be as close to the device pins as possible. for good ac per- formance, parasitic capacitances should be kept to a minimum at both inputs and at the output. resistor values should be kept under 5 k x be- cause of the rc time constants associated with the parasitic capacitance. metal-film and carbon resistors are both acceptable, use of wire-wound resistors is not recommended because of their parasitic inductance. similarly, capacitors should be low-inductance for best performance. the el2045c macromodel this macromodel has been developed to assist the user in simulating the el2045c with sur- rounding circuitry. it has been developed for the pspice simulator (copywritten by the microsim corporation), and may need to be rearranged for other simulators. it approximates dc, ac, and transient response for resistive loads, but does not accurately model capacitive loading. this model is slightly more complicated than the models used for low-frequency op-amps, but it is much more accurate for ac analysis. the model does not simulate these characteristics accurately: noise non-linearities settling-time temperature effects cmrr manufacturing variations psrr 10
el2045c low-power 100 mhz gain-of-2 stable operational amplifier el2045c macromodel e contd. * connections: a input * models * * l b input .model qn npn(is e 800e b 18 bf e 200 tf e 0.2ns) * ll a vsupply .model qpa pnp(is e 864e b 18 bf e 100 tf e 0.2ns) * lll b vsupply .model qp pnp(is e 800e b 18 bf e 125 tf e 0.2ns) * llll output .ends * lllll .subckt m2045 3 2746 * * input stage * ie 7 37 0.9ma r6 36 37 400 r7 38 37 400 rc1 4 30 850 rc2 4 39 850 q130336qp q2 39 2 38 qpa ediff 33 0 39 30 1.0 rdiff 33 0 1meg * * compensation section * ga0343301m rh 34 0 2meg ch 34 0 1.5pf rc 34 40 1k cc 40 0 1pf * * poles * ep4104001 rpa 41 42 200 cpa 42 0 2pf rpb 42 43 200 cpb 43 0 2pf * * output stage * ios1 7 50 1.0ma ios2 51 4 1.0ma q344350qp q474351qn q575052qn q645153qp ros1 52 6 25 ros265325 * * power supply current * ips 7 4 2.7ma * 11 tab wide td is 0.7in td is 0.7in
el2045c december 1995 rev c el2045c low-power 100 mhz gain-of-2 stable operational amplifier el2045c macromodel e contd. 2045 11 el2045c model 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

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