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EL2170C/el2270c/el2470c january 1996, rev. b EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback 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. ? 1995 elantec, inc. features # single (EL2170C), dual (el2270c) and quad (el2470c) topologies # 1 ma supply current (per amplifier) # 70 mhz b 3 db bandwidth # tiny sot23-5 package (EL2170C) # low cost # single- and dual-supply operation down to g 1.5v # 0.15%/0.15 diff. gain/diff. phase into 150 x # 800 v/ m s slew rate # large output drive current: 100 ma (EL2170C) 55 ma (el2270c) 55 ma (el2470c) # also available with disable in single (el2176c) and dual (el2276c) # higher speed el2180c/el2186c family also available (3 ma/ 250 mhz) in single, dual and quad applications # low power/battery applications # hdsl amplifiers # video amplifiers # cable drivers # rgb amplifiers # test equipment amplifiers # current to voltage converters ordering information part no. temp. range package outline y EL2170Cn b 40 cto a 85 c 8-pin pdip mdp0031 EL2170Cs b 40 cto a 85 c 8-pin soic mdp0027 EL2170Cw b 40 cto a 85 c 5-pin sot23 * mdp0038 el2270cn b 40 cto a 85 c 8-pin pdip mdp0031 el2270cs b 40 cto a 85 c 8-pin soic mdp0027 el2470cn b 40 cto a 85 c 14-pin pdip mdp0031 el2470cs b 40 cto a 85 c 14-pin soic mdp0027 * see ordering information section of databook. general description the EL2170C/el2270c/el2470c are single/dual/quad cur- rent-feedback operational amplifiers which achieve a b 3db bandwidth of 70 mhz at a gain of a 1 while consuming only 1 ma of supply current per amplifier. they will operate with dual supplies ranging from g 1.5v to g 6v, or from single sup- plies ranging from a 3v to a 12v. in spite of their low supply current, the el2270c and the el2470c can output 55 ma while swinging to g 4v on g 5v supplies. the EL2170C can output 100 ma with similar output swings. these attributes make the EL2170C/el2270c/el2470c excellent choices for low power and/or low voltage cable-driver, hdsl, or rgb applications. for applications where board space is extremely critical, the EL2170C is available in the tiny 5-lead sot23 package, which has a footprint 28% the size of an 8-lead soic. the EL2170C/ el2270c/el2470c are each also available in industry standard pinouts in pdip and soic packages. for single and dual applications with disable, consider the el2176c (8-pin single) or el2276c (14-pin dual). for higher speed applications where power is still a concern, consider the el2180c/el2186c family which also comes in similar single, dual, triple and quad configurations. the el2180c/el2186c family provides a b 3 db bandwidth of 250 mhz while consum- ing 3 ma of supply current per amplifier. connection diagrams EL2170C so, p-dip el2270c so, p-dip 2170 1 EL2170C sot23-5 2170 46 top view el2470c so, p-dip 2170 2
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers absolute maximum ratings (t a e 25 c) voltage between v s a and v s b a 12.6v common-mode input voltage v s b to v s a differential input voltage g 6v current into a in or b in g 7.5 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 (EL2170C) g 120 ma output current (el2270c) g 60 ma output current (el2470c) g 60 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. dc electrical characteristics v s e g 5v, r l e 150 x ,t a e 25 c unless otherwise specified parameter description conditions min typ max test units level v os input offset voltage 2.5 15 i mv tcv os average input offset measured from t min to t max 5v m v/ c voltage drift dv os v os matching el2270c, el2470c only 0.5 v mv a i in a input current 0.5 5 i m a d a i in a i in matching el2270c, el2470c only 20 v na b i in b input current 4 15 i m a d b i in b i in matching el2270c, el2470c only 1.5 v m a cmrr common mode rejection v cm e g 3.5v 45 50 i db ratio b icmr b input current common v cm e g 3.5v 4 10 i m a/v mode rejection psrr power supply rejection v s is moved from g 4v to g 6v 60 70 i db ratio b ipsr b input current power v s is moved from g 4v to g 6v 0.5 5 i m a/v supply rejection r ol transimpedance v out e g 2.5v 150 400 i k x a r in a input resistance v cm e g 3.5v 1 4 i m x a c in a input capacitance 1.2 v pf cmir common mode input range g 3.5 g 4.0 i v 2 td is 3.8in
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers dc electrical characteristics e contd. v s e g 5v, r l e 150 x ,t a e 25 c unless otherwise specified parameter description conditions min typ max test units level v o output voltage swing v s e g 5 g 3.5 g 4.0 i v v s ea 5 single-supply, high 4.0 v v v s ea 5 single-supply, low 0.3 v v i o output current EL2170C only 80 100 i ma el2270c only, per amplifier 50 55 i ma el2470c only, per amplifier 50 55 i ma i s supply current per amplifier 1 2 i ma ac electrical characteristics v s e g 5v, r f e r g e 1k x ,r l e 150 x ,t a e 25 c unless otherwise specified parameter description conditions min typ max test units level b 3dbbw b 3 db bandwidth a v ea 1 70 v mhz b 3dbbw b 3 db bandwidth a v ea 2 60 v mhz sr slew rate v out e g 2.5v, a v ea 2 400 800 iv v/ m s t r ,t f rise and fall time v out e g 500 mv 4.5 v ns t pd propagation delay v out e g 500 mv 4.5 v ns os overshoot v out e g 500 mv 3.0 v % t s 0.1% settling v out e g 2.5v, a v eb 140vns dg differential gain a v ea 2, r l e 150 x (note 1) 0.15 v % dp differential phase a v ea 2, r l e 150 x (note 1) 0.15 v dg differential gain a v ea 1, r l e 500 x (note 1) 0.02 v % dp differential phase a v ea 1, r l e 500 x (note 1) 0.01 v c s channel separation el2270c, el2470c only, f e 5 mhz 85 v db note 1: dc offset from 0v to 0.714v, ac amplitude 286 mv p-p ,f e 3.58 mhz. 3 td is 1.6in td is 2.6in
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers test circuit (per amplifier) 2170 3 simplified schematic (per amplifer) 2170 4 4
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers typical performance curves frequency response (gain) non-inverting 2170 5 frequency response (phase) non-inverting 2170 6 various r f and r g frequency response for 2170 7 response (gain) inverting frequency 2170 8 response (phase) inverting frequency 2170 9 various r l and c l frequency response for 2170 10 transimpedance (r ol ) 2170 11 psrr and cmrr 2170 12 for various c in b frequency response 2170 13 5
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers typical performance curves e contd. noise vs frequency voltage and current 2170 14 distortion vs frequency 2nd and 3rd harmonic 2170 15 vs frequency output voltage 2170 16 various non-inverting gains vs supply voltage for b 3 db bandwith and peaking 2170 17 various inverting gains vs supply voltage for b 3 db bandwith and peaking 2170 18 vs supply voltage output voltage swing 2170 19 supply voltage supply current vs 2170 20 vs supply voltage common-mode input range 2170 21 supply voltage slew rate vs 2170 22 6
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers typical performance curves e contd. die temperature input bias current vs 2170 23 die temperature short-circuit current vs 2170 24 die temperature transimpedance (r ol )vs 2170 25 various non-inverting gains vs die temperature for b 3 db bandwith and peaking 2170 26 various inverting gains vs die temperature for b 3 db bandwith and peaking 2170 27 die temperature input offset voltage vs 2170 28 die temperature supply current vs 2170 29 die temperature input voltage range vs 2170 30 die temperature slew rate vs 2170 31 7
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers typical performance curves e contd. at 3.58 mhz/a v ea 2 phase vs dc input voltage differential gain and 2170 32 at 3.58 mhz/a v ea 1 phase vs dc input offset differential gain and 2170 33 settling accuracy settling time vs 2170 34 small-signal step response 2170 35 large-signal step response 2170 36 vs ambient temperature maximum power dissipation 8-pin plastic dip 2170 37 vs ambient temperature maximum power dissipation 8-lead so 2170 38 8
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers typical performance curves e contd. vs ambient temperature maximum power dissipation 14-pin plastic dip 2170 39 vs ambient temperature maximum power dissipation 14-lead so 2170 40 vs frequency channel separation 2170 41 vs ambient temperature maximum power dissipation 5-lead plastic sot23 2170 47 9
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers applications information product description the EL2170C/el2270c/el2470c are current- feedback operational amplifiers that offer a wide b 3 db bandwidth of 70 mhz and a low supply current of 1 ma per amplifier. all of these prod- ucts also feature high output current drive. the EL2170C can output 100 ma, while the el2270c and the el2470c can output 55 ma per amplifi- er. the EL2170C/el2270c/el2470c work with supply voltages ranging from a single 3v to g 6v, and they are also capable of swinging to within 1v of either supply on the input and the output. because of their current-feedback topolo- gy, the EL2170C/el2270c/el2470c do not have the normal gain-bandwidth product associ- ated with voltage-feedback operational amplifi- ers. this allows their b 3 db bandwidth to re- main relatively constant as closed-loop gain is in- creased. this combination of high bandwidth and low power, together with aggressive pricing make the EL2170C/el2270c/el2470c the ideal choice for many low-power/high-bandwidth ap- plications such as portable computing, hdsl, and video processing. for applications where board space is extremely critical, the EL2170C is available in the tiny 5- lead sot23 package, which has a footprint 28% the size of an 8-lead soic. the EL2170C/ el2270c/el2470c are each also available in in- dustry standard pinouts in pdip and soic pack- ages. for single and dual applications with disable, consider the el2176c (8-pin single) and el2276c (14-pin dual). if higher speed is re- quired, refer to the el2180c/el2186c family which provides singles, duals, triples, and quads with 250 mhz of bandwidth while con- suming 3 ma of supply current per amplifier. 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. the power supply pins must be well bypassed to reduce the risk of oscillation. the combination of a 4.7 m f tantalum capacitor in parallel with a 0.1 m f capacitor has been shown to work well when placed at each supply pin. for good ac performance, parasitic capacitance should be kept to a minimum especially at the inverting input (see the capacitance at the in- verting input section). ground plane construc- tion should be used, but it should be removed from the area near the inverting input to mini- mize any stray capacitance at that node. carbon or metal-film resistors are acceptable with the metal-film resistors giving slightly less peaking and bandwidth because of their additional series inductance. use of sockets, particularly for the so package should be avoided if possible. sock- ets add parasitic inductance and capacitance which will result in some additional peaking and overshoot. capacitance at the inverting input any manufacturer's high-speed voltage- or cur- rent-feedback amplifier can be affected by stray capacitance at the inverting input. for inverting gains this parasitic capacitance has little effect because the inverting input is a virtual ground, but for non-inverting gains this capacitance (in conjunction with the feedback and gain resistors) creates a pole in the feedback path of the amplifi- er. this pole, if low enough in frequency, has the same destabilizing effect as a zero in the forward open-loop response. the use of large value feed- back and gain resistors further exacerbates the problem by further lowering the pole frequency. 10
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers applications information e contd. the experienced user with a large amount of pc board layout experience may find in rare cases that the EL2170C/el2270c/el2470c have less bandwidth than expected. the reduction of feed- back resistor values (or the addition of a very small amount of external capacitance at the in- verting input, e. g. 0.5 pf) will increase band- width as desired. please see the curves for fre- quency response for various r f and r g , and frequency response for various c in b . feedback resistor values the EL2170C/el2270c/el2470c have been de- signed and specified at gains of a 1 and a 2 with r f e 1k x . this value of feedback resistor gives 70 mhz of b 3 db bandwidth at a v ea 1 with about 1.5 db of peaking, and 60 mhz of b 3db bandwidth at a v ea 2 with about 0.5 db of peaking. since the EL2170C/el2270c/el2470c are current-feedback amplifiers, it is also possible to change the value of r f to get more bandwidth. as seen in the curve of frequency response for various r f and r g , bandwidth and peaking can be easily modified by varying the value of the feedback resistor. because the EL2170C/el2270c/el2470c are current-feedback amplifiers, their gain-band- width product is not a constant for different closed-loop gains. this feature actually allows the EL2170C/el2270c/el2470c to maintain about the same b 3 db bandwidth, regardless of closed-loop gain. however, as closed-loop gain is increased, bandwidth decreases slightly while sta- bility increases. since the loop stability is im- proving with higher closed-loop gains, it becomes possible to reduce the value of r f below the spec- ified 1 k x and still retain stability, resulting in only a slight loss of bandwidth with increased closed-loop gain. supply voltage range and single- supply operation the EL2170C/el2270c/el2470c have been de- signed to operate with supply voltages having a span of greater than 3v, and less than 12v. in practical terms, this means that the EL2170C/ el2270c/el2470c will operate on dual supplies ranging from g 1.5v to g 6v. with a single-sup- ply, the EL2170C/el2270c/el2470c will oper- ate from a 3v to a 12v. as supply voltages continue to decrease, it be- comes necessary to provide input and output voltage ranges that can get as close as possible to the supply voltages. the EL2170C/el2270c/ el2470c have an input voltage range that ex- tends to within 1v of either supply. so, for exam- ple, on a single a 5v supply, the EL2170C/ el2270c/el2470c have an input range which spans from 1v to 4v. the output range of the EL2170C/el2270c/el2470c is also quite large, extending to within 1v of the supply rail. on a g 5v supply, the output is therefore capable of swinging from b 4v to a 4v. single-supply out- put range is even larger because of the increased negative swing due to the external pull-down re- sistor to ground. on a single a 5v supply, output voltage range is about 0.3v to 4v. video performance for good video performance, an amplifier is re- quired to maintain the same output impedance and the same frequency response as dc levels are changed at the output. this is especially difficult when driving a standard video load of 150 x , be- cause of the change in output current with dc level. until the EL2170C/el2270c/el2470c, good differential gain could only be achieved by running high idle currents through the output transistors (to reduce variations in output imped- ance). these currents were typically more than the entire 1 ma supply current of each EL2170C/ el2270c/el2470c amplifier! special circuitry has been incorporated in the EL2170C/ el2270c/el2470c to reduce the variation of output impedance with current output. this re- sults in dg and dp specifications of 0.15% and 0.15 while driving 150 x at a gain of a 2. 11
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers applications information e contd. video performance has also been measured with a 500 x load at a gain of a 1. under these condi- tions, the EL2170C/el2270c/el2470c have dg and dp specifications of 0.01% and 0.02 respec- tively while driving 500 x at a v ea 1. output drive capability in spite of its low 1 ma of supply current, the EL2170C is capable of providing a minimum of g 80 ma of output current. similarly, each am- plifier of the el2270c and the el2470c is capa- ble of providing a minimum of g 50 ma. these output drive levels are unprecedented in amplifi- ers running at these supply currents. with a min- imum g 80 ma of output drive, the EL2170C is capable of driving 50 x loads to g 4v, making it an excellent choice for driving isolation trans- formers in telecommunications applications. similarly, the g 50 ma minimum output drive of each el2270c and el2470c amplifier allows swings of g 2.5v into 50 x loads. 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 EL2170C/ el2270c/el2470c from the cable and allow ex- tensive capacitive drive. however, other applica- tions may have high capacitive loads without a back-termination resistor. in these applications, a small series resistor (usually between 5 x and 50 x ) 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. in many cases it is also possible to simply increase the value of the feedback resistor (r f ) to reduce the peaking. current limiting the EL2170C/el2270c/el2470c have no inter- nal current-limiting circuitry. if any output is shorted, it is possible to exceed the absolute maximum ratings for output current or power dissipation, potentially resulting in the destruc- tion of the device. power dissipation with the high output drive capability of the EL2170C/el2270c/el2470c, it is possible to exceed the 150 c absolute maximum junction temperature under certain very high load current conditions. generally speaking, when r l falls be- low about 25 x , it is important to calculate the maximum junction temperature (t jmax ) for the application to determine if power-supply volt- ages, load conditions, or package type need to be modified for the EL2170C/el2270c/el2470c to remain in the safe operating area. these parame- ters are calculated as follows: t jmax e t max a ( i ja * n * pd max ) [ 1 ] where: t max e maximum ambient temperature i ja e thermal resistance of the package n e number of amplifiers in the pack- age pd max e maximum power dissipation of each amplifier in the package. pd max for each amplifier can be calculated as follows: pd max e (2 * v s * i smax ) a (v s b v outmax ) * (v outmax /r l )) [ 2 ] where: v s e supply voltage i smax e maximum supply current of 1 amplifier v outmax e max. output voltage of the ap- plication r l e load resistance 12
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers typical application circuits inverting 200 ma output current distribution amplifier 2170 42 fast-settling precision amplifier 2170 43 13
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers typical application circuits e contd. differential line-driver/receiver 2170 44 14
EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers EL2170C/el2270c/el2470c macromodel * revision a, march 1995 * transimpedance stage * ac characteristics used rf e rg e 1k x ,rl e 150 x * * connections: a input g1 0 18 17 0 1.0 * l b input rol 18 0 400k * ll a vsupply cdp 18 0 1.9pf * lll b vsupply * * llll output * output stage * lllll * .subckt el2170/el 32746 q141819qp * q271820qn * input stage q3 7 19 21 qn * q442022qp e1100301.0 r72164 vis1090v r82264 h2 9 12 vxx 1.0 ios1 7 19 0.4ma r1 2 11 165 ios2 20 4 0.4ma l1 11 12 25nh * iinp 3 0 0.5ua * supply current iinm 2 0 4ua * r12 3 0 4meg ip s741na ** * slew rate limiting * error terms ** h1 13 0 vis 600 ivos 0 23 2ma r2 13 14 1k vxx 23 0 0v d1 14 0 dclamp e4 2 40301.0 d2 0 14 dclamp e5 2 50701.0 * e626040 b 1.0 * high frequency pole r9 24 23 0.316k * r10 25 23 3.2k e2 30 0 14 0 0.00166666666 r11 26 23 3.2k l3 30 17 0.5uh * c5 17 0 0.69pf * models r5 17 0 300 * * .model qn npn(is e 5e-15 bf e 200 tf e 0.01ns) .model qp pnp(is e 5e-15 bf e 200 tf e 0.01ns) .model dclamp d(is e 1e-30 ibv e 0.266 a bv e 1.3v n e 4) .ends 15 td is 5.2in
EL2170C/el2270c/el2470c january 1996, rev. b EL2170C/el2270c/el2470c 70 mhz/1 ma current mode feedback amplifiers EL2170C/el2270c/el2470c macromodel e contd. 2170 45 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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