LM615IN中文资料

TL H 11057LM615 Quad Comparator and Adjustable ReferenceDecember1994LM615Quad Comparator and Adjustable Reference General DescriptionThe comparators have an input range which extends to thenegative supply and have open-collector outputs Improvedover the LM139series the input stages of the comparatorshave lateral PNP input transistors which enable low inputcurrents for large differential input voltages and swingsabove V aThe voltage reference is a three-terminal shunt-type band-gap and is referred to the V b terminal Two resistors pro-gram the reference from1 24V to6 3V with accuracy ofg0 6%available The reference features operation over ashunt current range of17m A to20mA low dynamic imped-ance broad capacitive load range and cathode terminalvoltage ranging from a diode-drop below V b to above V aAs a member of National’s Super-Block TM family theLM615is a space-saving monolithic alternative to a multi-chip solution offering a high level of integration without sac-rificing performanceFeaturesCOMPARATORSY Low operating current600m AY Wide supply voltage range4V to36VY Open-collector outputsY Input common-mode range V b to(V a b1 8V)Y Wide differential input voltage g36VREFERENCEY Adjustable output voltage1 24V to6 3VY Tight initial tolerance available g0 6%(25 C)Y Wide operating current range17m A to20mAY Tolerant of load capacitanceApplicationsY Adjustable threshold detectorY Time-delay generatorY Voltage window comparatorY Power supply monitorY RGB level detectorConnection DiagramM PackageTL H 11057–24Top ViewN PackageTL H 11057–1Top ViewOrdering InformationFor information about surface-mount packaging of this device please contact theAnalog Product Marketing group at National Semiconductor Corp headquarters ReferenceTemperature RangeNSC Tolerances Military Industrial Package Package Number b55 C s T J s a125 C b40 C s T J s a85 Cg0 6%at25 C LM615AMN LM615AIN16-Pin N16A80ppm C max Molded DIPLM615AMJ 88316-Pin J16A(Note13)Ceramic DIPg2 0%at25 C LM615MN LM615IN16-Pin N16A150ppm C max Molded DIPLM615IM16-Pin Narrow M16ASurface MountSuper-Block TM is a trademark of National Semiconductor CorporationC1995National Semiconductor Corporation RRD-B30M115 Printed in U S AAbsolute Maximum Ratings(Note1)If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Voltage on Any Pin Except V RO(referred to V b pin)(Note2)36V(Max) (Note3)b0 3V(Min) Current through Any Input Pinand V RO Pin g20mA Differential Input Voltage g36V Output Short-Circuit Duration(Note4) Storage Temperature Range b65 C s T J s a150 C Maximum Junction Temperature150 C Thermal Resistance Junction-to-Ambient(Note5)N Package95 C W Soldering InformationN Package Soldering(10seconds)260 C ESD Tolerance(Note6)g1kVOperating Temperature RangeLM615AI LM615I b40 C s T J s a85 C LM615A LM615M b55 C s T J s a125 CElectrical CharacteristicsThese specifications apply for V b e GND e0V V a e5V V CM e V OUT e V a 2 I R e100m A FEEDBACK pin shorted to GND unless otherwise specified Limits in standard typeface are for T J e25 C limits in boldface type apply over the Operating Temperature RangeLM615AM LM615MSymbol Parameter Conditions Typical LM615AI LM615IUnits (Note7)Limits Limits(Note8)(Note8)COMPARATORSI S Total Supply Current V a Current R LOAD e% 250550600m A max3V s V a s36V350600650m A maxV OS Offset Voltage over4V s V a s36V R L e15k X1 03 05 0mV max V a Range2 06 07 0mV maxV OS Offset Voltage over0V s V CM s(V a b1 8V)1 03 05 0mV max V CM Range V a e30V R L e15k X1 56 07 0mV maxD V OS D T Average Offset15m V C Voltage DriftI B Input Bias Current b52535nA maxb83040nA maxI OS Input Offset Current0 244nA max0 355nA maxA V Voltage Gain R L e10k X to36V 5005050V mV2V s V OUT s27V min100V mVt R Large Signal V a IN e1 4V V b IN e TTL1 5m s Response Time Swing R L e5 1k X2 0m sI SINK Output Sink Current V a IN e0V V b IN e1V 201010mA minV OUT e1 5V1388mA minV OUT e0 4V2 81 00 8mA min2 40 50 5mA minI L Output Leakage V a IN e1V V b IN e0V 0 11010m A maxCurrent V OUT e36V0 2m A2Electrical CharacteristicsThese specifications apply for V b e GND e0V V a e5V V CM e V OUT e V a 2 I R e100m A FEEDBACK pin shorted to GND unless otherwise specified Limits in standard typeface are for T J e25 C limits in boldface type apply over the Operating Temperature Range (Continued)LM615AM LM615MSymbol Parameter Conditions Typical LM615AI LM615IUnits (Note7)Limits Limits(Note8)(Note8)VOLTAGE REFERENCE(Note9)V R Reference1 2441 23651 2191V min Voltage1 25151 2689V max(g0 6%)(g2%)D V R D T Average Drift(Note10)1880150ppm C with Temperature maxD V R kH Average Drift T J e40 C400ppm kH with Time T J e150 C1000ppm kHD V R D T J Hysteresis(Note11)3 2m V CD V R D I R V R Change V R 100m A b V R 17m A 0 0511mV max with Current0 11 11 1mV maxV R 10mA b V R 100m A 1 555mV max(Note12)2 05 55 5mV maxR Resistance D V R 10mA to0 1mA 9 9mA0 20 560 56X maxD V R 100m A to17m A 83m A0 61313X maxD V R D V RO V R Change V R VRO e V Rb V R VRO e6 3V2 555mV max with V RO2 81010mV maxD V R D V a V R Change V R V a e5V b V R V a e36V 0 11 21 2mV max with V a Change0 11 31 3mV maxV R V a e5V b V R V a e3V 0 0111mV max0 011 51 5mV maxI FB FEEDBACK V b s V FB s5 06V223550nA maxBias Current294055nA max e n Voltage Noise BW e10Hz to10kHz30m V RMS Note1 Absolute maximum ratings indicate limits beyond which damage to the component may occur Electrical specifications do not apply when operating the device beyond its rated operating conditionsNote2 Input voltage above V a is allowed As long as one input pin voltage remains inside the common-mode range the comparator will deliver the correct output Note3 More accurately it is excessive current flow with resulting excess heating that limits the voltages on all pins When any pin is pulled a diode drop below V b a parasitic NPN transistor turns ON No latch-up will occur as long as the current through that pin remains below the Maximum Rating Operation is undefined and unpredictable when any parasitic diode or transistor is conductingNote4 Shorting an Output to V b will not cause power dissipation so it may be continuous However shorting an Output to any more positive voltage(including V a) will cause80mA(typ )to be drawn through the output transistor This current multiplied by the applied voltage is the power dissipation in the output transistor If the total power from all shorted outputs causes the junction temperature to exceed150 C degraded reliability or destruction of the device may occur To determine junction temperature see Note5Note5 Junction temperature may be calculated using T J e T A a P D i JA The given thermal resistance is worst-case for packages in sockets in still air For packages soldered to copper-clad board with dissipation from one comparator or reference output transistor nominal i JA is80 C W for the N packageNote6 Human body model 100pF discharge through a1 5k X resistorNote7 Typical values in standard typeface are for T J e25 C values in boldface type apply for the full operating temperature range These values represent the most likely parametric normNote8 All limits are guaranteed for T J e a25 C(standard type face)or over the full operating temperature range(bold type face)Note9 V RO is the reference output voltage which may be set for1 2V to6 3V(see Application Information) V R is the V RO-to-FEEDBACK voltage(nominally 1 244V)Note10 Average reference drift is calculated from the measurement of the reference voltage at25 C and at the temperature extremes The drift in ppm C is 106 D V R V R 25 C D T J where D V R is the lowest value subtracted from the highest V R 25 C is the value at25 C and D T J is the temperature range This parameter is guaranteed by design and sample testingNote11 Hysteresis is the change in V RO caused by a change in T J after the reference has been‘‘dehysterized ’’To dehysterize the reference that is minimize the hysteresis to the typical value its junction temperature should be cycled in the following pattern spiraling in toward25 C 25 C 85 C b40 C 70 C 0 C 25 C Note12 Low contact resistance is required for accurate measurementNote13 A military RETS electrical test specification is available on request The LM615AMJ 883may also be procured as a Standard Military Drawing3Simplified Schematic DiagramsComparatorTL H 11057–2 Reference BiasTL H 11057–34Typical Performance Characteristics (Reference)T J e 25 C FEEDBACK pin shorted to V b e 0V unless otherwise notedvs Temperature Reference Voltage Drift vs Time Reference Voltage Voltage Drift vs TimeAccelerated Reference and Temperature vs CurrentReference Voltage and Temperaturevs CurrentReference Voltage vs Reference CurrentReference Voltage vs Reference Current Reference Voltage Stability RangeReference AC Voltagevs FEEDBACK-to-V b FEEDBACK Current Voltagevs FEEDBACK-to-V b FEEDBACK Current Voltage vs Frequency Reference NoiseResistance vs FrequencyReference Small-Signal TL H 11057–45Typical Performance Characteristics (Reference)(Continued)T J e 25 C FEEDBACK pin shorted to V b e 0V unless otherwise notedPower-Up TimeReferenceVoltage Stepwith FEEDBACK Reference Voltage Current Stepwith 100E 12m A Reference Voltage Current Step for 100m E 10mA Reference Step Response Voltage StepChange with Supply Reference Voltage TL H 11057–5Typical Performance Characteristics (Comparators)T J e 25 C V a e 5V V b e 0V unless otherwise notedvs Supply Voltage Supply Current VoltageCurrent vs Common-Mode Input-BiasDifferential Input VoltageInput Current vsTL H 11057–66Typical Performance Characteristics (Comparators)(Continued)Voltage vs Sink CurrentOutput SaturationNegative TransitionTimes Inverting Input Small-Signal Response Positive TransitionTimes Inverting Input Small-Signal Response Positive Transition Times Non-Inverting Input Small-Signal Response Negative Transition Times Non-Inverting Input Small-Signal ResponsePositive TransitionTimes Inverting Input Large-Signal Response Negative Transition Times-Inverting Input Large-Signal Response Positive Transition Times Non-Inverting Input Large-Signal ResponseNegative TransitionTimes Non-Inverting Input Large-Signal ResponseTL H 11057–87Application InformationVOLTAGE REFERENCEReference BiasingThe voltage reference is of a shunt regulator topology that models as a simple zener diode With current I r flowing in the‘‘forward’’direction there is the familiar diode transfer function I r flowing in the reverse direction forces the refer-ence voltage to be developed from cathode to anode The cathode may swing from a diode drop below V b to the ref-erence voltage or to the avalanche voltage of the parallel protection diode nominally7V A6 3V reference with V a e 3V is allowedTL H 11057–9 FIGURE1 Voltage Associated with Reference(Current Source I r is External)The reference equivalent circuit reveals how V r is held at the constant1 2V by feedback and how the FEEDBACK pin passes little currentTo generate the required reverse current typically a resistor is connected from a supply voltage higher than the refer-ence voltage Varying that voltage and so varying I r has small effect with the equivalent series resistance of less than an ohm at the higher currents Alternatively an active current source such as the LM134series may generate I rTL H 11057–10 FIGURE2 Reference Equivalent CircuitTL H 11057–11FIGURE3 1 2V ReferenceCapacitors in parallel with the reference are allowed See the Reference AC Stability Range typical curve for capaci-tance values from20m A to3mA any capacitor value is stable With the reference’s wide stability range with resis-tive and capacitive loads a wide range of RC filter values will perform noise filteringAdjustable ReferenceThe FEEDBACK pin allows the reference output voltage V ro to vary from1 24V to6 3V The reference attempts to hold V r at1 24V If V r is above1 24V the reference will conduct current from Cathode to Anode FEEDBACK cur-rent always remains low If FEEDBACK is connected to An-ode then V ro e V r e1 24V For higher voltages FEED-BACK is held at a constant voltage above Anode say3 76V for V ro e5V Connecting a resistor across the con-stant V r generates a current I e R1 V r flowing from Cath-ode into FEEDBACK node A Thevenin equivalent3 76V is generated from FEEDBACK to Anode with R2e3 76 I Keep I greater than one thousand times larger than FEED-BACK bias current for k0 1%error I t32m A for the mili-tary grade over the military temperature range(I t5 5m A for a1%untrimmed error for an industrial temperature range part)TL H 11057–12FIGURE4 Thevenin Equivalent ofReference with5V OutputTL H 11057–13 R1e V r I e1 24 32m e39kR2e R1 (V ro V r)b1 e39k (5 1 24)b1 e118kFIGURE5 Resistors R1and R2ProgramReference Output Voltage to be5V8Application Information (Continued)Understanding that V r is fixed and that voltage sources re-sistors and capacitors may be tied to the FEEDBACK pin a range of V r temperature coefficients may be synthesizedTL H 11057–14FIGURE 6 Output Voltage has Negative TemperatureCoefficient (TC)if R2has Negative TCTL H 11057–15FIGURE 7 Output Voltage has Positive TCif R1has Negative TCTL H 11057–16FIGURE 8 Diode in Series with R1Causes Voltage Across R1and R2to be Proportional to AbsoluteTemperature (PTAT)Connecting a resistor across V RO -to-FEEDBACK creates a 0TC current source but a range of TCs may be synthe-sizedTL H 11057–17I e V r R1e 1 24 R1FIGURE 9 Current Source is Programmed by R1TL H 11057–18FIGURE 10 Proportional-to-Absolute-TemperatureCurrent SourceTL H 11057–19FIGURE 11 Negative-TC Current SourceReference HysteresisThe reference voltage depends slightly on the thermal his-tory of the die Competitive micro-power products vary al-ways check the data sheet for any given device Do not assume that no specification means no hysteresis9Application Information(Continued) COMPARATORSAny of the comparators or the reference may be biased in any way with no effect on the other sections of the LM615 except when a substrate diode conducts(see Electrical Characteristics Note3) For example one or both inputs of one comparator may be outside the input voltage range lim-its the reference may be unpowered and the other compar-ators will still operate correctly Unused comparators should have inverting input and output tied to V b and non-inverting input tied to V aHysteresisAny comparator may oscillate or produce a noisy output if the applied differential input voltage is near the compara-tor’s offset voltage This usually happens when the input signal is moving very slowly across the comparator’s switch-ing threshold This problem can be prevented by the addi-tion of hysteresis or positive feedback as shown in Figure 12TL H 11057–20 FIGURE12 R S and R F Add Hysteresis to Comparator The amount of hysteresis added in Figure12isV H e V a xR S (R F a R S)V a x R SR Ffor R F n R SA good rule of thumb is to add hysteresis of at least the maximum specified offset voltage More than about50mV of hysteresis can substantially reduce the accuracy of the comparator since the offset voltage is effectively being in-creased by the hysteresis when the comparator output is highIt is often a good idea to decrease the amount of hysteresis until oscillations are observed then use three times that minimum hysteresis in the final circuit Note that the amount of hysteresis needed is greatly affected by layout The amount of hysteresis should be rechecked each time the layout is changed such as changing from a breadboard to a P C boardInput StageThe input stage uses lateral PNP input transistors which unlike those of many op amps have breakdown voltage BV EBO equal to the absolute maximum supply voltage Also they have no diode clamps to the positive supply nor across the inputs These features make the inputs look like high impedances to input sources producing large differential and common-mode voltagesThe guaranteed common-mode input voltage range for an LM615is V b s V CM s(V a b1 8V) over temperature This is the voltage range in which the comparisons must be made If both inputs are within this range the output will be at the correct state If one input is within this range and the other input is less than(V b a32V) even if this is greater than V a the output will be at the correct state If however either or both inputs are driven below V b and either input current exceeds10m A the output state is not guaranteed to be correct If both inputs are above(V a b1 8V) the output state is also not guaranteed to be correctOutput StageThe comparators have open-collector output stages which require a pull-up resistor from each output pin to a positive supply voltage of the output to switch properly When the internal output transistor is off the output(HIGH)voltage will be pulled up to this external positive voltageTo ensure that the LOW output voltage is under the TTL-low threshold the output transistor’s load current must be less than0 8mA(over temperature)when it turns on This im-pacts the minimum value of the pull-up resistor10Typical ApplicationsPower Supply MonitorTL H 11057–21V OUT1and V OUT2are optional digital outputs and are LOW when the corresponding LED is ON All resistors 1%tolerance or betterTracking Comparator TL H 11057–22R1–C1removes the low-frequency signal component so that through R2–C2the higher-frequency component is detected4-Threshold Level DetectorTL H 11057–231112Physical Dimensions inches(millimeters)Ceramic Dual-In-Line Package(J)Order Number LM615AMJ 883NS Package Number J16A16-Pin Narrow Surface Mount Package(M)Order Number LM615IMNS Package Number M16A13L M 615Q u a d C o m p a r a t o r a n d A d j u s t a b l e R e f e r e n c ePhysical Dimensions inches (millimeters)(Continued)16-Pin Molded Dual-In-Line Package (N)Order Number LM615IN or LM615MNNS Package Number N16ALIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or 2 A critical component is any component of a life systems which (a)are intended for surgical implant support device or system whose failure to perform can into the body or (b)support or sustain life and whose be reasonably expected to cause the failure of the life failure to perform when properly used in accordance support device or system or to affect its safety or with instructions for use provided in the labeling can effectivenessbe reasonably expected to result in a significant injury to the userNational Semiconductor National Semiconductor National Semiconductor National Semiconductor CorporationEuropeHong Kong LtdJapan Ltd1111West Bardin RoadFax (a 49)0-180-530858613th Floor Straight Block Tel 81-043-299-2309。