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data sheet ?2009-2012 cadeka microcircuits, llc www.cadeka.com LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 LMV321 ge n eral purpose, rail-to-rail output ampli? er rail-to-rail ampli? ers f e a t u r e s n 130"a 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 speci? ed at 2.7v and 5v supplies n LMV321: pb-free tsot-5 a p p l i c a t i o n s n portable/battery-powered applications n mobile communications, cell phones, pagers n adc buffer n active ? lters 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 ampli? er. the LMV321 consumes only 130"a 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. *advance information, contact cadeka for availability.

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data sheet LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 2 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 con? guration 23 5 4 -in +v s out 1 -v s +in - +
data sheet LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 3 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 re? ect 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 LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 4 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 speci? cations are guaranteed by testing, design, or characterization
data sheet LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 5 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 speci? cations are guaranteed by testing, design, or characterization
data sheet LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 6 typical performance characteristics at +5v - contin ued t a = 25c, v s = +5v, r f = r g =10k", r l = 10k" to v s /2, g = 2; unless otherwise noted.

supply current vs. supply voltage input current vs. temperature non-inverting small signal pulse response non-inverting small signal pulse response non-inverting small signal pulse response non-inverting small signal pulse response v out vs. v cm +5v v out vs. v cm +2.7v v io vs. cmr +5v v io vs. cmr +2.7v
data sheet LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 7 typical performance characteristics at +5v - contin ued t a = 25c, v s = +5v, r f = r g =10k", r l = 10k" to v s /2, g = 2; unless otherwise noted.

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data sheet LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 8 typical performance characteristics at +5v - contin ued t a = 25c, v s = +5v, r f = r g =10k", r l = 10k" to v s /2, g = 2; unless otherwise noted.

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input voltage noise vs. frequency thd vs. frequency non-inverting small signal pulse response non-inverting small signal pulse response non-inverting small signal pulse response non-inverting small signal pulse response psrr vs. frequency cmrr vs. frequency slew rate vs. supply voltage output voltage swing vs. supply voltage
data sheet LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 9 typical performance characteristics at +5v - contin ued t a = 25c, v s = +5v, r f = r g =10k", r l = 10k" to v s /2, g = 2; unless otherwise noted.
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data sheet LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 10 typical performance characteristics at +5v - contin ued t a = 25c, v s = +5v, r f = r g =10k", r l = 10k" to v s /2, g = 2; unless otherwise noted.

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data sheet LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 11 typical performance characteristics at +5v - contin ued t a = 25c, v s = +5v, r f = r g =10k", r l = 10k" to v s /2, g = 2; unless otherwise noted.

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data sheet LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 12 application information general description the LMV321 is a single supply, general purpose, vol tage- feedback ampli? er fabricated on a cmos process. th e LMV321 offers 1mhz gain bandwidth product, >1v/"s s lew rate, and only 130"a 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 value s will not cause phase reversal. however, if the inpu t 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 off ers ?soft? saturation protection that improves recovery time.f igures 1, 2, and 3 illustrate typical circuit con? guratio ns for non- inverting, inverting, and unity gain topologies for dual supply applications. they show the recommended bypass cap acitor values and overall closed loop gain equations. figu re 4 shows the typical non-inverting gain circuit for si ngle 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 it?s 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 LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 13 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 speci? ed 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, thi s 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 ampli? er and the load to help improve stability and settling performance. refer to figure 5.
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 de? ned as the point when either one of the inputs or the output exceed their speci? ed voltage range. overdrive recovery is the time needed for the ampli? er 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.

!" #$ %$& ' %$& figure 6. overdrive recovery layout considerations general layout and supply bypassing play major roles in high frequency performance. cadeka 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 LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 ?2009-2012 cadeka microcircuits, llc www.cadeka.com 14 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 ampli? er 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
for additional information regarding our products, please visit cadeka at: cadeka.com cadeka, the cadeka logo design, comlinear, and the comlinear logo design are trademarks or registered trademarks of cadeka microcircuits llc. all other brand and product names may be trademarks of their respective companies. cadeka reserves the right to make changes to any products and services herein at any time without notice. cadeka does not assume any responsibility or liability arising out of the application or use of any product or service described herein, except as expressly agreed to in writing by cadeka; nor does the purchase, lease, or use of a product or service from cadeka convey a license under any patent rights, copyrights, trademark rights, or any other of the intellectual property rights of cadeka or of third parties. copyright ?2009-2012 cadeka microcircuits, llc. all rights reserved. cadeka headquarters loveland, colorado t: 970.663.5452 t: 877.663.5452 (toll free) data sheet LMV321 ge n eral purpose, rail-to-rail output ampli? er rev 1 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.

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