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features n 130a supply current n 1mhz gain bandwidth n input voltage range with 5v supply: -0.2v to 4.2v n output voltage range with 5v supply: 0.065v to 4.99v n > 1v/s slew rate n no crossover distortion n fully specifed at 2.7v and 5v supplies n LMV321: pb-free tsot-5 applications n portable/battery-powered applications n mobile communications, cell phones, pagers n adc buffer n active flters n portable test instruments n signal conditioning n medical equipment n portable medical instrumentation general description the LMV321 is a single channel, low cost, voltage feedback amplifer. the LMV321 consumes only 130a of supply current and is designed to operate from a supply range of 2.7v to 5.5v (1.35 to 2.75). the input voltage range extends 200mv below the negative rail and 800mv below the positive rail. the LMV321 is fabricated on a cmos process. it offers 1mhz gain bandwidth product and >1v/s slew rate. the combination of low power, low supply voltage operation, and rail-to-rail performance make the LMV321 well suited for battery-powered systems. the LMV321 is packaged in the space saving tsot-5 package. tsot-5 package is pin compatible with the sot23-5 package. typical performance examples ordering information part number package pb-free rohs compliant operating temperature range packaging method LMV321ist5x tsot-5 yes yes -40c to +85c reel moisture sensitivity level for all parts is msl-1. ? ??? ???? ? ??? ??? ??? ??? ? ?????????????????? ? ? ????????? ?? ???? ???? ? ??? ?? ?? ?? ?? ? ? ? ? ?????????????????? ? ?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ????????????? ?? ??????????? ???????????? ??? ??? ??? ??? ??? ? ??? ? ??? ? ????????????? ?????????????????? ? ? ?? ? ? ????? ? v in = 1vpp data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a l mv321 ge n eral purpose, rail-to-rail output amplifer rail-to-rail amplifers exar corporation www.exar.com 48720 kato road, fremont ca 94538, usa tel. +1 510 668-7000 - fax. +1 510 668-7001
?2009-2013 exar corporation 2/15 rev 1a LMV321 pin assignments 1 pin no. pin name description 1 +in positive input 2 -v s negative supply 3 -in negative input 4 out output 5 +v s positive supply notes: 1.pin compatible to sot23-5. LMV321 pin confguration 2 3 5 4 -in +v s out 1 -v s +in - + data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 3/15 rev 1a absolute maximum ratings the safety of the device is not guaranteed when it is operated above the absolute maximum ratings. the device should not be operated at these absolute limits. adhere to the recommended operating conditions for proper de - vice function. the information contained in the electrical characteristics tables and typical performance plots refect the operating conditions noted on the tables and plots. parameter min max unit supply voltage 7 v input voltage range -v s -0.4v +v s v continuous output current output is protected against momentary short circuit reliability information parameter min typ max unit junction temperature 150 c storage temperature range -65 150 c lead temperature (soldering, 10s) 260 c package thermal resistance 5-lead tsot 221 c/w notes: package thermal resistance ( q ja ), jdec standard, multi-layer test boards, still air. esd protection product tsot-5 human body model (hbm) 2kv charged device model (cdm) 2kv recommended operating conditions parameter min typ max unit operating temperature range -40 +85 c supply voltage range 2.7 5.5 v data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 4/15 rev 1a electrical characteristics at +2.7v t a = 25c, v s = +2.7v, r f = r g =10 k, r l = 10k to v s /2, g = 2; unless otherwise noted. symbol parameter conditions min typ max units dc performance v io input offset voltage 1.7 7 mv dv io average drift 5 v/c i b input bias current <1 250 na i os input offset current <1 50 na cmrr common mode rejection ratio 0v v cm 1.7v 50 63 db psrr power supply rejection ratio 2.7v v + 5v, v o =1v, v cm =1v 50 60 db cmir common mode input range for v cm 50 db 0 -0.2 v 1.9 1.7 v v out output voltage swing r l = 10k to v s / 2 v + -100 v + -10 mv 60 180 mv i s supply current 110 170 a ac performance gbwp gain bandwidth product c l =200 pf 1 mhz m phase margin 60 g m gain margin 10 db e n input voltage noise f = 1khz 46 nv/hz notes: min max specifcations are guaranteed by testing, design, or characterization data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 5/15 rev 1a electrical characteristics at +5v t a = 25c, v s = +5v, r f = r g =10k, r l = 10k to v s /2, g = 2; unless otherwise noted. boldface limits apply at the temperature extremes. symbol parameter conditions min typ max units dc performance v io input offset voltage 1.7 7 9 mv dv io average drift 5 v/c i b input bias current <1 250 500 na i os input offset current <1 50 150 na cmrr common mode rejection ratio 0v v cm 4v 50 65 db psrr power supply rejection ratio 2.7v v + 5v, v o =1v, v cm =1v 50 60 db cmir common mode input range for v cm 50 db 0 -0.2 v 4.2 4 v a ol open-loop gain r l = 2k 15 10 100 v/mv v out output voltage swing r l = 2k to v s / 2 v + -300 v + -400 v + -40 mv 120 300 400 mv r l = 10k to v s / 2 v + -100 v + -200 v + -10 mv 65 180 280 mv i sc short circuit output current sourcing v o =0v 5 60 ma sinking v o =5v 10 160 ma i s supply current 130 250 350 a ac performance sr slew rate >1 v/s gbwp gain bandwidth product c l =200 pf 1 mhz m phase margin 60 g m gain margin 10 db e n input voltage noise f = 1khz 39 nv/hz notes: min max specifcations are guaranteed by testing, design, or characterization data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 6/15 rev 1a typical performance characteristics at +5v - continued t a = 25c, v s = +5v, r f = r g =10k, r l = 10k to v s /2, g = 2; unless otherwise noted. ? ??? ???? ? ??? ??? ??? ??? ? ?????????????????? ? ? ?????????? ?? ???? ???? ? ??? ???? ???? ???? ??? ??? ?????????????????? ? ?? ??? ? ? ?? ? ? ? ? ? ?? ? ?? ???? ? ? ?????????? ??? ?? ?? ? ? ???? ?? ???? ? ??? ? ??? ? ?? ??? ? ? ?? ? ? ? ? ? ?? ? ?? ???? ? ? ????????? ??? ?? ?? ? ? ?????????? ? ?? ??? ? ??? ???? ? ??? ??? ??? ??? ? ??????? ? ? ????????? ?? ???? ???? ? ??? ?? ?? ?? ?? ? ? ? ? ??????? ? ?? ??? ?? ?? ??? ??? ??? ??? ??? ??? ???????????????? a) ????????? ????????? ????????? ? ?? ?? ?? ?????? ???????????????? ?????????????????? ? ??? ???? ? ??? ??? ??? ??? ? ?????????????????? ? ? ????? ? ?? ??? ? ?? ?? ???? ???? ? ??? ??? ??? ? ?? ?? ?? ?? ?????????????????? ???????????????? ???????????????????????? ??????????????????????????? ?????????????????????????? ?????????????????????????? ?????????????????????????? ?????????????????????????? ? ? ???? ? ???? ? ? ???? ? ????? ? io vs. cmr +5v v io vs. cmr +2.7v data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 7/15 rev 1a typical performance characteristics at +5v - continued t a = 25c, v s = +5v, r f = r g =10k, r l = 10k to v s /2, g = 2; unless otherwise noted. ??? ? ?? ??? ? ?????? ???? ????? ???? ????? ???? ??? ? ?? ?????????????????????????????????? ? ? ??????? ??? ? ?? ??? ? ???? ???? ????? ???? ????? ???? ??? ? ?? ??????????????????????????????????? ? ? ??????? ??? ? ?? ??? ???? ? ???? ???? ????? ???? ??? ????? ???? ??? ? ?? ??????????????????????????????????? ? ? ????? ??? ? ?? ??? ? ?????? ???? ????? ???? ????? ???? ??? ? ?? ?????????????????????????????????? ? ? ????? ?? ?? ??? ??? ??? ??? ??? ??? ?????????????????????????? ? ? ????? ??????? ? ?? ?? ?? ??? ??? ??? ??? ? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?????????????????????????? ???????????????? ? ? ??????? ?? ?? ?? ?? ?? ?? ?? ??? ?????????????????????????? ? ? ????? ???????? ? ?? ?? ?? ??? ??? ??? ??? ? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?????????????????????????? ???????????????? ? ? ??????? ???????????????????????????????????????????? ?????????????????????????????????????????????? ????????????????????????????? ????????????????????????????? ????????????????????????????? ????????????????????????????? ??????????????????????????????????? ????????????????????????????????????? ????????????????????????????????? ??????????????????????????????????? data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 8/15 rev 1a typical performance characteristics at +5v - continued t a = 25c, v s = +5v, r f = r g =10k, r l = 10k to v s /2, g = 2; unless otherwise noted. ?? ?? ?? ?? ?? ?? ????????? ? ? ???? ? ? ?????? ?? ?? ?? ???? ??? ? ?? ??????????????? ? ?? ??? ? ?? ? ? ???? ? ? ? ?? ?? ?? ?? ?? ?? ??????????????????????????????????????? ? ? ????? ? ?????????????? ? ? ? ? ??? ? ??? ? ??? ? ??????????????????????????????????????? ?????????????????? ?????????????? ??? ??? ??? ??? ??? ??? ??? ??? ????????????? ?? ??????????? ???????????? ??? ??? ??? ??? ??? ? ??? ? ??? ? ????????????? ?????????????????? ? ? ?? ? ? ????? ? v in = 1vpp ?? ?? ?? ?? ?? ?? ????????? ? ? ???? ? ? ?????? ?? ?? ?? ????? ???? ??? ? ?? ??? ???? ??????????????? ? ? ???? ? ?? ?? ?? ?? ?? ?? ??? ??? ??? ???????????????????????????? ? ? ??????? ? ?? ?? ?? ?? ???? ??? ? ?? ??? ???????????????????????????? ??????????????? ? ? ????? ???? ??? ? ?? ??????? ? ? ?????????? ? ????? ??? ??? ?? ? ????????????????? ??? ?????? ????? ????? ???? ??? ? ?? ??? ??????????????? ? ? ??????? ? ????? ??? ??? ?? ? ? ????????????????? ??? ??? ?? ? ? ???????? ? ?????? ??? ????? ?? ??????????????????? ??????????????? ?????????????????? ?????????????????? ?????????????????? ?????????????????? ?????????????? ???????????? ????????????? ?????????????????? data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 9/15 rev 1a typical performance characteristics at +5v - continued t a = 25c, v s = +5v, r f = r g =10k, r l = 10k to v s /2, g = 2; unless otherwise noted. ?? ?? ?? ?? ?? ?? ??? ??? ?? ?? ?? ?? ?? ?? ?? ?? ?????????????????? ????????? ????? ? ? ?????? ? ? ? ???? ? ? ? ????? ? ???? ??? ??? ? ?? ??? ??? ? ?? ????? ???? ??? ? ?? ?????????????????? ??????????????? ???? ? ? ????? ?? ??? ???? ?????????????????? ?) ? ? ????? ? ? ??????? ? ?? ? ?? ??? ???? ?????????????????? ??????????????? ?? ?? ?? ?? ?? ?? ??? ??? ?? ?? ?? ?? ?? ?? ?? ?? ?????????????????? ????????? ????? ? ? ?????? ? ? ? ???? ? ? ? ????? ? ???? ??? ??? ? ?? ??? ??? ? ?? ????? ???? ??? ? ?? ?????????????????? ??????????????? ???? ? ? ??????? ?? ?? ?? ?? ?? ?? ??? ??? ?? ?? ?? ?? ?? ?? ?? ?? ?????????????????? ????????? ???? ????? ????? ????? ????? ???? ????? ????? ????? ????? ??? ??? ? ?? ??? ??? ? ?? ????? ???? ??? ? ?? ?????????????????? ??????????????? ?? ???? ??????? ? ? ? ????? ? ? ???? ? ? ?? ??? ? ?? ?? ?? ?? ??? ??? ? ?? ?? ?? ?? ?? ?? ?? ?? ?????????????????? ????????? ????? ? ? ???????? ? ? ??????? ? ? ??????? ???? ? ? ????? ???? ???? ??? ??? ? ?? ??? ??? ??? ??? ? ???? ??? ? ?? ?????????????????? ??????????????? ? ? ????? ? ? ????? ? ? ?? ??? ? ?? ?? ?? ?? ??? ??? ? ?? ?? ?? ?? ?? ?? ?? ?? ?????????????????? ????????? ????? ? ? ???????? ? ??????? ? ? ??????? ???? ? ? ????? ???? ???? ??? ??? ? ?? ??? ??? ??? ??? ? ???? ??? ? ?? ?????????????????? ??????????????? ? ? ??????? ? ? ????? ? ? ?????? ? l =600 non-inverting small signal pulse response non-inverting small signal pulse response non-inverting small signal pulse response non-inverting small signal pulse response open loop frequency response vs. temperature open loop frequency response 5v open loop frequency response +2.7v open loop output impedance vs. frequency gain and phase vs. capacitive load r l =100k data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 10/15 rev 1a typical performance characteristics at +5v - continued t a = 25c, v s = +5v, r f = r g =10k, r l = 10k to v s /2, g = 2; unless otherwise noted. ???????? ? ? ????? ? ? ???? ? ? ? ???????? ???????????? ??????? s/div) ????????????? ???????? ? ? ????? ? ? ???? ? ? ? ???????? ???????????? ??????? s/div) ????????????? ???????? ? ? ????? ? ? ???? ? ? ? ???????? ???????????? ??????? s/div) ????????????? ?????????? ? ? ????? ? ? ???? ? ? ? ???????? ???????????? ??????? s/div) ????????????? ?????????? ? ? ????? ? ? ???? ? ? ? ???????? ???????????? ??????? s/div) ????????????? ?????????? ? ? ????? ? ? ???? ? ? ? ???????? ???????????? ??????? s/div) ????????????? ??????????????????????????????? ??????????????????????????????? ????????????????????????????????? ????????????????????????????????? ????????????????????????????????? ????????????????????????????????? ??????????????????????????????? ?????????????????????????????? ?????????????????????????????? ?????????????????????????????? data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 11/15 rev 1a typical performance characteristics at +5v - continued t a = 25c, v s = +5v, r f = r g =10k, r l = 10k to v s /2, g = 2; unless otherwise noted. ???????? ? ? ????? ? ? ???? ? ? ? ???????? ???????????? ??????? s/div) ????????????? ???????? ? ? ????? ? ? ???? ? ? ? ???????? ???????????? ??????? s/div) ????????????? ???????? ? ? ????? ? ? ???? ? ? ? ???????? ???????????? ??????? s/div) ????????????? ?????????? ? ? ????? ? ? ???? ? ? ? ???????? ???????????? ??????? s/div) ????????????? ?????????? ?? ????? ?? ???? ? ?????????? ???????????? ??????? s/div) ????????????? ?????????? ? ? ????? ? ? ???? ? ? ? ???????? ???????????? ??????? s/div) ????????????? ????????????????????????????????? ????????????????????????????????? ????????????????????????????????? ????????????????????????????????? ????????????????????????????????? ????????????????????????????????? ????????????????????????????????? ???????????????????????????????? ???????????????????????????????? ???????????????????????????????? data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 12/15 rev 1a application information general description the LMV321 is a single supply, general purpose, voltage- feedback amplifer fabricated on a cmos process. the LMV321 offers 1mhz gain bandwidth product, >1v/s slew rate, and only 130a supply current. it features a rail-to-rail output stage and is unity gain stable. the common mode input range extends to 200mv below ground and to 800mv below vs. exceeding these values will not cause phase reversal. however, if the input voltage exceeds the rails by more than 0.5v, the input esd devices will begin to conduct. the output will stay at the rail during this overdrive condition. the output stage is short circuit protected and offers soft saturation protection that improves recovery time.figures 1, 2, and 3 illustrate typical circuit confgurations for non- inverting, inverting, and unity gain topologies for dual supply applications. they show the recommended bypass capacitor values and overall closed loop gain equations. figure 4 shows the typical non-inverting gain circuit for single supply applications + - r f 0.1f 6.8f output g = 1 + ( r f /r g ) input +v s -v s r g 0.1f 6.8f r l figure 1. typical non-inverting gain circuit + - r f 0.1f 6.8f output g = - ( r f /r g ) for optimum input offset voltage set r 1 = r f || r g input +v s -v s 0.1f 6.8f r l r g r 1 figure 2. typical inverting gain circuit + - 0.1f 6.8f output g = 1 input +v s -v s 0.1f 6.8f r l figure 3. unity gain circuit + - r f 0.1f 6.8f output input +v s r g r l figure 4. single supply non-inverting gain circuit power dissipation power dissipation should not be a factor when operating under the stated 2k load condition. however, applications with low impedance, dc coupled loads should be analyzed to ensure that maximum allowed junction temperature is not exceeded. guidelines listed below can be used to verify that the particular application will not cause the device to operate beyond its intended operating range. maximum power levels are set by the absolute maximum junction rating of 150c. to calculate the junction temperature, the package thermal resistance value theta ja (? ja ) is used along with the total die power dissipation. t junction = t ambient + (? ja p d ) where t ambient is the temperature of the working environment. in order to determine p d , the power dissipated in the load needs to be subtracted from the total power delivered by data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 13/15 rev 1a the supplies. p d = p supply - p load supply power is calculated by the standard power equation. p supply = v supply i rms supply v supply = v s+ - v s- power delivered to a purely resistive load is: p load = ((v load ) rms 2 )/rload eff the effective load resistor (rload eff ) will need to include the effect of the feedback network. for instance, rload eff in figure 3 would be calculated as: r l || (r f + r g ) these measurements are basic and are relatively easy to perform with standard lab equipment. for design purposes however, prior knowledge of actual signal levels and load impedance is needed to determine the dissipated power. here, p d can be found from p d = p quiescent + p dynamic - p load quiescent power can be derived from the specifed i s values along with known supply voltage, v supply . load power can be calculated as above with the desired signal amplitudes using: (v load ) rms = v peak / 2 ( i load ) rms = ( v load ) rms / rload eff the dynamic power is focused primarily within the output stage driving the load. this value can be calculated as: p dynamic = (v s+ - v load ) rms ( i load ) rms assuming the load is referenced in the middle of the power rails or v supply /2. the LMV321 is short circuit protected. however, this may not guarantee that the maximum junction temperature (+150c) is not exceeded under all conditions. driving capacitive loads increased phase delay at the output due to capacitive loading can cause ringing, peaking in the frequency response, and possible unstable behavior. use a series resistance, r s , between the amplifer and the load to help improve stability and settling performance. refer to figure 5. + - r f input output r g r s c l r l figure 5. addition of r s for driving capacitive loads for a given load capacitance, adjust r s to optimize the tradeoff between settling time and bandwidth. in general, reducing r s will increase bandwidth at the expense of additional overshoot and ringing. overdrive recovery an overdrive condition is defned as the point when either one of the inputs or the output exceed their specifed voltage range. overdrive recovery is the time needed for the amplifer to return to its normal or linear operating point. the recovery time varies, based on whether the input or output is overdriven and by how much the range is exceeded. the LMV321 and will typically recover in less than 5us from an overdrive condition. figure 6 shows the LMV321 in an overdriven condition. ?? ?? ?? ? ? ? ? ? ?? ?? ?? ?? ??? ????????????? ?????? s) ? ? ????????? ? ? ????? ? ? ? ???????? ???????????? ????????????? ????????????????? ?????????????? ?????? ????? ???? ????? ?????? ???? ??? ??? ??? ??? ????? ???????? ? adeka has evaluation boards to use as a guide for high frequency layout and as an aid in device testing and characterization. follow the steps below as a basis for high frequency layout: ? include 6.8f and 0.1f ceramic capacitors for power data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 14/15 rev 1a supply decoupling ? place the 6.8f capacitor within 0.75 inches of the power pin ? place the 0.1f capacitor within 0.1 inches of the power pin ? remove the ground plane under and around the part, especially near the input and output pins to reduce parasitic capacitance ? minimize all trace lengths to reduce series inductances evaluation board schematics evaluation board schematics and layouts are shown in figures 7-9. these evaluation boards are built for dual supply operation. follow these steps to use the board in a single-supply application: 1. short -vs to ground. 2. use c3 (6.8uf) and c4 (0.1uf), if the -vs pin of the amplifer is not directly connected to the ground plane. figure 7. ceb004 schematic figure 8. ceb004 top view figure 9. ceb004 bottom view r l + - r f 0.1f 6.8f output input +v s r g 0.1f 6.8f r l r in -v s 1 3 2 5 4 r out data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a
?2009-2013 exar corporation 15/15 rev 1a mechanical dimensions tsot-5 package note: 1. all dimensions are in millimeters. 2. package length does not include interlead falsh or protrusion 3. package width does notinclude interlead falsh or protrusion. 4. lead coplanarity (bottom of leads after forming) shall be 0.10 millimeters max. 5. drawing confroms to jedec mo-193, variation aa. 6. drawing is not to scale. data sheet l mv321 ge n eral purpose, rail-to-rail output amplifer rev 1a for further assistance: exar corporation headquarters and sales offces 48720 kato road tel.: +1 (510) 668-7000 fremont, ca 94538 - usa fax: +1 (510) 668-7001 www.exar.com notice exar corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. exar corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. charts and schedules contained here in are only for illustration purposes and may vary depending upon a users specifc application. while the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to signifcantly affect its safety or effectiveness. products are not authorized for use in such applications unless exar corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of exar corporation is adequately protected under the circumstances. reproduction, in part or whole, without the prior written consent of exar corporation is prohibited.

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