OPA2365资料

OPA365OPA2365SBOS365A − JUNE 2006 − REVISED JULY 20062.2V, 50MHz, Low-Noise,Single-Supply Rail-to-RailOPERATIONAL AMPLIFIERSFEATURESDDDDDDDDDDRAIL-TO-RAIL INPUT WITHOUT CROSSOVER2.2V OPERATIONLOW OFFSET: 200µVWIDE BANDWIDTH: 50MHzCMRR: 100dB (min)HIGH SLEW RATE: 25V/µsLOW NOISE: 4.5nV//HzLOW THD+NOISE: 0.0006%QUIESCENT CURRENT: 5mA (max)microPACKAGE: SOT23-5DESCRIPTIONThe OPAx365 zer∅-crossover series rail-to-rail high-performance CMOS operational amplifiers are opti-mized for very low voltage, single-supply applications.Rail-to-rail input/output, low-noise (4.5nV/√Hz) andhigh-speed operations (50MHz Gain Bandwidth) makethem ideal for driving sampling analog-to-digital con-verters (ADCs). Applications incude audio, signal con-ditioning, and sensor amplification. The OPA365 familyof op amps are well-suited for cell phone power amplifi-er control loops.Special features include excellent common-mode re-jection ratio (CMRR), no input stage crossover distor-tion, high input impedance and rail-to-rail input and out-put swing. The input common-mode range includesboth the negative and positive supplies. The output volt-age swing is within 10mV of the rails.The OPA365 (single version) is available in the micro-SIZE SOT23-5 and SO-8 packages. The OPA2365(dual version) is offered in the microSIZE DFN-8 (3mmx 3mm) and SO-8 packages. All versions are specifiedfor operation from −40°C to +125°C. Single and dualversions have identical specifications for maximum de-sign flexibility.APPLICATIONSDDDDDDDSIGNAL CONDITIONINGDATA ACQUISITIONPROCESS CONTROLACTIVE FILTERSTEST EQUIPMENTAUDIOWIDEBAND AMPLIFIERSPACKAGEOPA365vsCOMPETITION0−20THD+NoiseRatio(dB)−40−60−80CompetitorA−100−120CompetitorBVIN+5Vfi=10kHzBW=30kHzSOT23-5SO-8(1)DFN-8(1)OPA365OPA2365nnnn(1)Available Q3, 2006.OPA365123VIN=VOUT(VPP)45Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstrumentssemiconductor products and disclaimers thereto appears at the end of this data sheet.All trademarks are the property of their respective owners.PRODUCTION DATA information is current as of publication date. Productsconform to specifications per the terms of Texas Instruments standard warranty.Production processing does not necessarily include testing of all parameters.Copyright  2006, Texas Instruments Incorporatedwww.ti.com元器件交易网www.cecb2b.com

OPA365OPA2365www.ti.comSBOS365A − JUNE 2006 − REVISED JULY 2006ABSOLUTE MAXIMUM RATINGS(1)Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5.5VSignal Input Terminals, Voltage(2) . . . . (V−) −0.5V to (V+) + 0.5VSignal Input Terminals, Current(2) . . . . . . . . . . . . . . . . . . . . ±10mAOutput Short-Circuit(3) Continuous. . . . . . . . . . . . . . . . . . . . . . . . . Operating Temperature. . . . . . . . . . . . . . . . . . . . . −40°C to +150°CStorage Temperature. . . . . . . . . . . . . . . . . . . . . . . −65°C to +150°CJunction Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°CESD RatingHuman Body Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4000VCharged Device Model. . . . . . . . . . . . . . . . . . . . . . . . . . . 1000V(1)Stresses above these ratings may cause permanent damage.Exposure to absolute maximum conditions for extended periodsmay degrade device reliability. These are stress ratings only, andfunctional operation of the device at these or any other conditionsbeyond those specified is not supported.(2)Input terminals are diode-clamped to the power-supply rails.Input signals that can swing more than 0.5V beyond the supplyrails should be current limited to 10mA or less.(3)Short-circuit to ground, one amplifier per package.This integrated circuit can be damaged by ESD. TexasInstruments recommends that all integrated circuits behandled with appropriate precautions. Failure to observeproper handling and installation procedures can cause damage.ESD damage can range from subtle performance degradation tocomplete device failure. Precision integrated circuits may be moresusceptible to damage because very small parametric changes couldcause the device not to meet its published specifications.ORDERING INFORMATION(1)PRODUCTOPA365OPA2365PACKAGE-LEADSOT23-5SO-8(2)SO-8(2)DFN-8(2)PACKAGE DESIGNATORDBVDDDRBPACKAGE MARKINGOAVQO365AO2365ABRA(1)For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web siteat www.ti.com.(2)Available Q3, 2006.PIN CONFIGURATIONSTop ViewOPA365VOUTV−+IN123SOT23−54−IN5V+NC(1)−IN+INV−1234OPA3658765SO−8NC(1)V+VOUTNC(1)VOUTA−INA+INAV−1234OPA23658765SO−8,DFN−8V+VOUTB−INB+INB(1)NC denotes no internal connection.2元器件交易网www.cecb2b.com

OPA365OPA2365www.ti.comSBOS365A − JUNE 2006 − REVISED JULY 2006ELECTRICAL CHARACTERISTICS: VS = +2.2V to +5.5V Boldface limits apply over the specified temperature range, TA = −40°C to +125°C.At TA = +25°C, RL = 10kΩ connected to VS/2, VCM = VS/2, and VOUT = VS/2, unless otherwise noted.OPAx365PARAMETEROFFSET VOLTAGEInput Offset VoltageVOSDriftdVOS/dTvs Power SupplyPSRRChannel Separation, dcINPUT BIAS CURRENTInput Bias CurrentIBover TemperatureInput Offset CurrentIOSNOISEInput Voltage Noise, f = 0.1Hz to 10Hz enInput Voltage Noise Density, f = 100kHz enInput Current Noise Density, f = 10kHz inINPUT VOLTAGE RANGECommon-Mode Voltage RangeVCMCommon-Mode Rejection RatioCMRRINPUT CAPACITANCEDifferentialCommon-ModeOPEN-LOOP GAINOpen-Loop Voltage GainAOLTEST CONDITIONSMINTYP1001100.2MAX200100UNITµVµV/°CµV/VµV/VpApAµVPPnV/√HzfA/√Hz(V+) + 0.112062RL = 10kΩ, 100mV < VO < (V+) − 100mVRL = 600Ω, 200mV < VO < (V+) − 200mVRL = 600Ω, 200mV < VO < (V+) − 200mVVS = 5VG = +14V Step, G = +14V Step, G = +1VIN x Gain > VSRL = 600Ω, VO = 4VPP, G = +1, f = 1kHz10010094120120VdBpFpFdBdBdBMHzV/µsnsnsµs%VS = +2.2V to +5.5V±0.2±10See Typical Characteristics±0.2±1054.54(V−) − 0.1100(V−) − 0.1V 3 VCM 3 (V+) + 0.1VFREQUENCY RESPONSEGain-Bandwidth ProductSlew RateSettling Time, 0.1%0.01%Overload Recovery TimeTotal Harmonic Distortion + NoiseOUTPUTVoltage Output Swing from Railover TemperatureShort-Circuit CurrentCapacitive Load DriveOpen-Loop Output ImpedancePOWER SUPPLYSpecified Voltage RangeQuiescent Current Per Amplifierover TemperatureTEMPERATURE RANGESpecified RangeThermal ResistanceSOT23-5SO-8DFN-8GBWSRtSTHD+N5025200300< 0.10.0006RL = 10kΩ, VS = 5.5VISCCLf = 1MHz, IO = 0VSIQ1020±65See Typical Characteristics302.25.555+12520015046mVmAΩVmAmA°C°C/W°C/W°C/W°C/WIO = 04.6−40qJA3元器件交易网www.cecb2b.com

OPA365OPA2365www.ti.comSBOS365A − JUNE 2006 − REVISED JULY 2006TYPICAL CHARACTERISTICSAt TA = +25°C, VS = +5V, and CL = 0pF, unless otherwise noted.OPEN−LOOPGAIN/PHASEvsFREQUENCY140120PSRR,CMRR(dB)VoltageGain(dB)100806040200−20101001k10k100k1M10MFrequency(Hz)OFFSETVOLTAGEPRODUCTIONDISTRIBUTIONVS=5.5V−180100MGainPhasePhase(_)−90−45014012010080POWERSUPPLYANDCOMMON−MODEREJECTIONRATIOvsFREQUENCYCMRRPSRR6040200101001k10k100k1M10M100MFrequency(Hz)OFFSETVOLTAGEDRIFTPRODUCTIONDISTRIBUTIONVS=5.5V−135−200−180−160−140−120−100−80−60−40−20020406080100120140160180200Population00.10.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.0OffsetVoltageDrift(µV/_C)INPUTBIASCURRENTvsCOMMON−MODEVOLTAGE500400300IB(pA)2001000−25−0.50VCMSpecifiedRange1250.51.01.52.02.53.03.54.04.55.05.5VCM(V)OffsetVoltage(µV)INPUTBIASCURRENTvsTEMPERATURE9008007006005004003002001000−50−250255075100Temperature(_C)4InputBias(pA)Population1000元器件交易网www.cecb2b.com

OPA365OPA2365www.ti.comSBOS365A − JUNE 2006 − REVISED JULY 2006TYPICAL CHARACTERISTICS (continued)At TA = +25°C, VS = +5V, and CL = 0pF, unless otherwise noted.OUTPUTVOLTAGEvsOUTPUTCURRENT32OutputVoltage(V)10−1−2−30102030405060708090100OutputCurrent(mA)QUIESCENTCURRENTvsSUPPLYVOLTAGE4.754.80−40_C+125_C+25_C+25_C−40_CVS=±1.1VVS=±2.75VShort−CircuitCurrent(mA)706050403020100−10−20−30−40−50−60−70−80SHORT−CIRCUITCURRENTvsTEMPERATUREISC++125_CISC−−50−250255075100125Temperature(_C)QUIESCENTCURRENTvsTEMPERATUREQuiescentCurrent(mA)4.50QuiescentCurrent(mA)4.744.684.254.624.004.563.752.22.53.03.54.04.55.05.5SupplyVoltage(V)4.50−50−250255075100125Temperature(_C)0.1Hzto10HzINPUTVOLTAGENOISE0.01TOTALHARMONICDISTORTION+NOISEvsFREQUENCYG=10,RL=600ΩTHD+N(%)VO=1VRMS2µV/div0.001VO=1.448VRMSG=+1,RL=600Ω0.00011s/div101001kFrequency(Hz)VO=1VRMS10k100k5元器件交易网www.cecb2b.com

OPA365OPA2365www.ti.comSBOS365A − JUNE 2006 − REVISED JULY 2006TYPICAL CHARACTERISTICS (continued)At TA = +25°C, VS = +5V, and CL = 0pF, unless otherwise noted.1kINPUTVOLTAGENOISESPECTRALDENSITY6050OVERSHOOTvsCAPACITIVELOADVoltageNoise(nV/√Hz)G=+1Overshoot(%)10040G=−1302010G=−10G=+10101101001kFrequency(Hz)SMALL−SIGNALSTEPRESPONSEG=1RL=10kΩVS=±2.510k100k00100CapacitiveLoad(pF)LARGE−SIGNALSTEPRESPONSEG=1RL=10kΩVS=±2.51kOutputVoltage(50mV/div)Time(50ns/div)SMALL−SIGNALSTEPRESPONSEG=1RL=600ΩVS=±2.5OutputVoltage(1V/div)Time(250ns/div)LARGE−SIGNALSTEPRESPONSEG=1RL=600ΩVS=±2.5OutputVoltage(50mV/div)Time(50ns/div)OutputVoltage(1V/div)Time(250ns/div)6元器件交易网www.cecb2b.com

OPA365OPA2365www.ti.comSBOS365A − JUNE 2006 − REVISED JULY 2006APPLICATIONS INFORMATIONOPERATING CHARACTERISTICSThe OPA365 amplifier parameters are fully specifiedfrom +2.2V to +5.5V. Many of the specifications applyfrom −40°C to +125°C. Parameters that can exhibit sig-nificant variance with regard to operating voltage ortemperature are presented in the Typical Characteris-tics.R210kΩ+1.5VR11kΩC1100nFV+OPA365VOUTC2100nFGENERAL LAYOUT GUIDELINESThe OPA365 is a wideband amplifier. To realize the fulloperational performance of the device, good high-fre-quency printed circuit board (PCB) layout practices arerequired. Low-loss, 0.1µF bypass capacitors must beconnected between each supply pin and ground asclose to the device as possible. The bypass capacitortraces should be designed for minimum inductance.BASIC AMPLIFIER CONFIGURATIONSAs with other single-supply op amps, the OPA365 maybe operated with either a single supply or dual supplies.A typical dual-supply connection is shown in Figure 1,which is accompanied by a single-supply connection.The OPA365 is configured as a basic inverting amplifierwith a gain of −10V/V. The dual-supply connection hasan output voltage centered on zero, while the single−supply connection has an output centered on the com-mon-mode voltage VCM. For the circuit shown, this volt-age is 1.5V, but may be any value within the common-mode input voltage range. The OPA365 VCM rangeextends 100mV beyond the power-supply rails.VINV−−1.5Va)DualSupplyConnectionR210kΩ+3VR11kΩC1100nFV+OPA365VINV−VOUTVCM=1.5Vb)Single−SupplyConnectionFigure 1. Basic Circuit Connections7元器件交易网www.cecb2b.com

OPA365OPA2365www.ti.comSBOS365A − JUNE 2006 − REVISED JULY 2006Figure 2 shows a single-supply, electret microphoneapplication where VCM is provided by a resistive divider.The divider also provides the bias voltage for the elec-tret element.INPUT AND ESD PROTECTIONThe OPA365 incorporates internal electrostatic dis-charge (ESD) protection circuits on all pins. In the caseof input and output pins, this protection primarily con-sists of current steering diodes connected between theinput and power-supply pins. These ESD protectiondiodes also provide in-circuit, input overdrive protec-tion, provided that the current is limited to 10mA asstated in the Absolute Maximum Ratings. Figure 3shows how a series input resistor may be added to thedriven input to limit the input current. The added resistorcontributes thermal noise at the amplifier input and itsvalue should be kept to the minimum in noise-sensitiveapplications.RAIL−TO−RAIL INPUTThe OPA365 product family features true rail-to-rail in-put operation, with supply voltages as low as ±1.1V(2.2V). A unique zer∅-crossover input topology elimi-nates the input offset transition region typical of manyrail-to-rail, complementary stage operational amplifiers.This topology also allows the OPA365 to provide superi-or common−mode performance over the entire inputrange, which extends 100mV beyond both power-sup-ply rails; see Figure 4. When driving ADCs, the highlylinear VCM range of the OPA365 assures that the opamp/ADC system linearity performance is not compro-mised.Clean3.3VSupply49kΩ3.3V4kΩOPA365VOUTElectretMicrophone6kΩ5kΩ1µFFigure 2. Microphone PreamplifierV+IOVERLOAD10mAmaxVIN5kΩOPA365VOUTFigure 3. Input Current ProtectionOFFSETVOLTAGEvsCOMMON−MODEVOLTAGE200150100VOS(µV)500−50−100−150−200−3−2−10123CompetitorsVS=±2.75VOPA365Common−ModeVoltage(V)Figure 4. OPA365 has Linear Offset Over theEntire Common-Mode Range8元器件交易网www.cecb2b.com

OPA365OPA2365www.ti.comSBOS365A − JUNE 2006 − REVISED JULY 2006A simplified schematic illustrating the rail-to-rail inputcircuitry is shown in Figure 5.CAPACITIVE LOADSThe OPA365 may be used in applications where drivinga capacitive load is required. As with all op amps, theremay be specific instances where the OPA365 can be-come unstable, leading to oscillation. The particular opamp circuit configuration, layout, gain and output load-ing are some of the factors to consider when establish-ing whether an amplifier will be stable in operation. Anop amp in the unity-gain (+1V/V) buffer configurationand driving a capacitive load exhibits a greater tenden-cy to be unstable than an amplifier operated at a highernoise gain. The capacitive load, in conjunction with theop amp output resistance, creates a pole within thefeedback loop that degrades the phase margin. Thedegradation of the phase margin increases as the ca-pacitive loading increases.When operating in the unity-gain configuration, theOPA365 remains stable with a pure capacitive load upto approximately 1nF. The equivalent series resistance(ESR) of some very large capacitors (CL > 1µF) is suffi-cient to alter the phase characteristics in the feedbackloop such that the amplifier remains stable. Increasingthe amplifier closed-loop gain allows the amplifier todrive increasingly larger capacitance. This increasedcapability is evident when observing the overshoot re-sponse of the amplifier at higher voltage gains. See thetypical characteristic graph, Small-Signal Overshootvs. Capacitive Load.One technique for increasing the capacitive load drivecapability of the amplifier operating in unity gain is to in-sert a small resistor, typically 10Ω to 20Ω, in series withthe output; see Figure 6. This resistor significantly re-duces the overshoot and ringing associated with largecapacitive loads. A possible problem with this techniqueis that a voltage divider is created with the added seriesresistor and any resistor connected in parallel with thecapacitive load. The voltage divider introduces a gainerror at the output that reduces the output swing. Theerror contributed by the voltage divider may be insignifi-cant. For instance, with a load resistance, RL = 10kΩ,and RS = 20Ω, the gain error is only about 0.2%. Howev-er, when RL is decreased to 600Ω, which the OPA365is able to drive, the error increases to 7.5%.VCC+1.8VPatentPendingVeryLowRippleTopologyRegulatedChargePumpVOUT=VCC+1.8VVSIBIASIBIASIBIASVIN−VIN+VOUTIBIASFigure 5. Simplified SchematicV+RSOPA365VIN10Ωto20ΩRLCLVOUTFigure 6. Improving Capacitive Load Drive9元器件交易网www.cecb2b.com

OPA365OPA2365www.ti.comSBOS365A − JUNE 2006 − REVISED JULY 2006ACHIEVING AN OUTPUT LEVEL OF ZERO VOLTS (0V)Certain single-supply applications require the op ampoutput to swing from 0V to a positive full-scale voltageand have high accuracy. An example is an op ampemployed to drive a single-supply ADC having an inputrange from 0V to +5V. Rail-to-rail output amplifiers withvery light output loading may achieve an output levelwithin millivolts of 0V (or +VS at the high end), but not0V. Furthermore, the deviation from 0V only becomesgreater as the load current required increases. This in-creased deviation is a result of limitations of the CMOSoutput stage.When a pull-down resistor is connected from the ampli-fier output to a negative voltage source, the OPA365can achieve an output level of 0V, and even a few milli-volts below 0V. Below this limit, nonlinearity and limitingconditions become evident. Figure 7 illustrates a circuitusing this technique.A pull-down current of approximately 500µA is requiredwhen OPA365 is connected as a unity-gain buffer.A practical termination voltage (VNEG) is −5V, butother convenient negative voltages also may beused. The pull-down resistor RL is calculated fromRL = [(VO −VNEG)/(500µA)]. Using a minimum outputvoltage (VO) of 0V, RL = [0V−(−5V)]/(500µA)] = 10kΩ.Keep in mind that lower termination voltages result insmaller pull-down resistors that load the output duringpositive output voltage excursions.Note that this technique does not work with all op ampsand should only be applied to op amps such as theOPA365 that have been specifically designed to oper-ate in this manner. Also, operating the OPA365 outputat 0V changes the output stage operating conditions,resulting in somewhat lower open-loop gain and band-width. Keep these precautions in mind when driving acapacitive load because these conditions can affect cir-cuit transient response and stability.ACTIVE FILTERINGThe OPA365 is well-suited for active filter applicationsrequiring a wide bandwidth, fast slew rate, low-noise,single-supply operational amplifier. Figure 8 shows a500kHz, 2nd-order, low-pass filter utilizing the multiple−feedback (MFB) topology. The components have beenselected to provide a maximally-flat Butterworthresponse. Beyond the cutoff frequency, roll-off is−40dB/dec. The Butterworth response is ideal for ap-plications requiring predictable gain characteristicssuch as the anti-aliasing filter used ahead of an ADC.V+=+5VOPA365VIN500µAOpAmpsNegativeSupplyGroundedVOUTRP=10kΩ−V=−5V(AdditionalNegativeSupply)Figure 7. Swing-to-GroundR3549ΩC2150pFV+R1549ΩVINC11nFOPA365V−VOUTR21.24kΩFigure 8. Second-Order Butterworth 500kHzLow-Pass Filter10元器件交易网www.cecb2b.com

OPA365OPA2365www.ti.comSBOS365A − JUNE 2006 − REVISED JULY 2006One point to observe when considering the MFB filteris that the output is inverted, relative to the input. If thisinversion is not required, or not desired, a noninvertingoutput can be achieved through one of these options:1) adding an inverting amplifier; 2) adding an additional2nd-order MFB stage; or 3) using a noninverting filtertopology such as the Sallen-Key (shown in Figure 9).MFB and Sallen-Key, low-pass and high-pass filter syn-thesis is quickly accomplished using TI’s FilterPro pro-gram. This software is available as a free download atwww.ti.com.DRIVING AN ANALOG-TO-DIGITAL CONVERTERVery wide common-mode input range, rail-to-rail inputand output voltage capability and high speed make theOPA365 an ideal driver for modern ADCs. Also, be-cause it is free of the input offset transition characteris-tics inherent to some rail-to-rail CMOS op amps, theOPA365 provides low THD and excellent linearitythroughout the input voltage swing range.Figure 10 shows the OPA365 driving an ADS8326,16-bit, 500kSPS converter. The amplifier is connectedas a unity-gain, noninverting buffer and has an outputswing to 0V, making it directly compatible with the ADCminus full-scale input level. The 0V level is achieved bypowering the OPA365 V− pin with a small negative volt-age established by the diode forward voltage drop.A small, signal-switching diode or Schottky diodeprovides a suitable negative supply voltage of −0.3 to−0.7V. The supply rail-to-rail is equal to V+, plus thesmall negative voltage.C3220pFR11.8kΩVIN=1VRMSR219.5kΩC13.3nFR3150kΩC247pFOPA365VOUTFigure 9. Configured as a 3-Pole, 20kHz, Sallen-Key Filter+5VC1100nFV+OPA365V−VIN0to4.096VOptional(2)R2500Ω−5VC2100nFSD1BAS40C3(1)1nF100ΩR1(1)+5V+IN−INADS832616−Bit100kSPSREFIN+5VREF32404.096VC4100nFNOTES:(1)Suggestedvalue;mayrequireadjustmentbasedonspecificapplication.(2)Single−supplyapplicationsloseasmallnumberofADCcodesneargroundduetoopampoutputswinglimitation.Ifanegativepowersupplyisavailable,thissimplecircuitcreatesa−0.3Vsupplytoallowoutputswingtotruegroundpotential.Figure 10. Driving the ADS832611元器件交易网www.cecb2b.com

OPA365OPA2365www.ti.comSBOS365A − JUNE 2006 − REVISED JULY 2006One method for driving an ADC that negates the needfor an output swing down to 0V uses a slightly com-pressed ADC full-scale input range (FSR). For exam-ple, the 16-bit ADS8361 (shown in Figure 11) has amaximum FSR of 0V to 5V, when powered by a +5Vsupply and VREF of 2.5V. The idea is to match the ADCinput range with the op amp full linear output swingrange; for example, an output range of +0.1 to +4.9V.The reference output from the ADS8361 ADC is divideddown from 2.5V to 2.4V using a resistive divider. TheADC FSR then becomes 4.8VPP centered on a com-mon-mode voltage of +2.5V. Current from the ADS8361reference pin is limited to about ±10µA. Here, 5µA wasused to bias the divider. The resistors must be preciseto maintain the ADC gain accuracy. An additional bene-fit of this method is the elimination of the negative sup-ply voltage; it requires no additional power-supply cur-rent.An RC network, consisting of R1 and C1, is included be-tween the op amp and the ADS8361. It not only pro-vides a high-frequency filter function, but more impor-tantly serves as a charge reservoir used for chargingthe converter internal hold capacitance. This capabilityassures that the op amp output linearity is maintainedas the ADC input characteristics change throughout theconversion cycle. Depending on the particular applica-tion and ADC, some optimization of the R1 and C1 val-ues may be required for best transient performance.R210kΩ+5VC1100nFV+OPA365VIN0.1Vto4.9VV−100ΩR3(1)R110kΩ+5V−INC2(1)1nF+INADS836116−Bit100kSPSREFOUTREFIN+2.5VNOTE:(1)Suggestedvalue;mayrequireadjustmentbasedonspecificapplication.R420kΩ+2.4VR5480kΩC31µFFigure 11. Driving the ADS836112元器件交易网www.cecb2b.com

OPA365OPA2365www.ti.comSBOS365A − JUNE 2006 − REVISED JULY 2006Figure 12 illustrates the OPA2365 dual op amp provid-ing signal conditioning within an ADS1258 bridge sen-sor circuit. It follows the ADS1258 16:1 multiplexer andis connected as a differential in/differential out amplifier.The voltage gain for this stage is approximately 10V/V.Driving the ADS1258 internal ADC in differential mode,rather than in a single-ended, exploits the full linearityperformance capability of the converter. For best com-mon-mode rejection the two R2 resistors should beclosely matched.Note that in Figure 12, the amplifiers, bridges,ADS1258 and internal reference are powered by thesame single +5V supply. This ratiometric connectionhelps cancel excitation voltage drift effects and noise.For best performance, the +5V supply should be as freeas possible of noise and transients.When the ADS1258 data rate is set to maximum andthe chop feature enabled, this circuit yields 12 bits ofnoise-free resolution with a 50mV full-scale input.The chop feature is used to reduce the ADS1258 offsetand offset drift to very low levels. A 2.2nF capacitor isrequired across the ADC inputs to bypass the samplingcurrents. The 47Ω resistors provide isolation for theOPA2365 outputs from the relatively large, 2.2nF ca-pacitive load. For more information regarding theADS1258, see the product data sheet available fordown load at www.ti.com.+5VRFI0.1µF2kΩRFI2kΩRFIAIN1AIN0AVSSAVDDREFP+REFN10µF0.1µF10µF+2.2nFR347ΩR347ΩOPA2365…2kΩ2kΩRFIMUXOUTNMUXOUTPRFIAIN15AINCOMRFI+5V0.1µFOPA2365R2=10kΩR1=2.2kΩR2=10kΩNOTE:G=1+2R2/R1.MatchR2resistorsforoptimumCMRR.Figure 12. Conditioning Input Signals to the ADS1258 on a Single-SupplyADCINNADCINP…AIN14…ADS125813元器件交易网www.cecb2b.com

PACKAGEOPTIONADDENDUM

www.ti.com

21-Jul-2006

PACKAGINGINFORMATION

OrderableDeviceOPA365AIDBVROPA365AIDBVRG4OPA365AIDBVTOPA365AIDBVTG4

(1)

Status(1)ACTIVEACTIVEACTIVEACTIVE

PackageTypeSOT-23SOT-23SOT-23SOT-23

PackageDrawingDBVDBVDBVDBV

PinsPackageEcoPlan(2)

Qty5555

3000Green(RoHS&

noSb/Br)3000Green(RoHS&

noSb/Br)250250

Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)

Lead/BallFinishCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAU

MSLPeakTemp(3)Level-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIM

Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.

LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.

NRND:Notrecommendedfornewdesigns.Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.

PREVIEW:Devicehasbeenannouncedbutisnotinproduction.Samplesmayormaynotbeavailable.OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.

(2)

EcoPlan-Theplannedeco-friendlyclassification:Pb-Free(RoHS),Pb-Free(RoHSExempt),orGreen(RoHS&noSb/Br)-pleasecheckhttp://www.ti.com/productcontentforthelatestavailabilityinformationandadditionalproductcontentdetails.TBD:ThePb-Free/Greenconversionplanhasnotbeendefined.

Pb-Free(RoHS):TI'sterms\"Lead-Free\"or\"Pb-Free\"meansemiconductorproductsthatarecompatiblewiththecurrentRoHSrequirementsforall6substances,includingtherequirementthatleadnotexceed0.1%byweightinhomogeneousmaterials.Wheredesignedtobesolderedathightemperatures,TIPb-Freeproductsaresuitableforuseinspecifiedlead-freeprocesses.

Pb-Free(RoHSExempt):ThiscomponenthasaRoHSexemptionforeither1)lead-basedflip-chipsolderbumpsusedbetweenthedieandpackage,or2)lead-baseddieadhesiveusedbetweenthedieandleadframe.ThecomponentisotherwiseconsideredPb-Free(RoHScompatible)asdefinedabove.

Green(RoHS&noSb/Br):TIdefines\"Green\"tomeanPb-Free(RoHScompatible),andfreeofBromine(Br)andAntimony(Sb)basedflameretardants(BrorSbdonotexceed0.1%byweightinhomogeneousmaterial)

(3)

MSL,PeakTemp.--TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.

ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.Effortsareunderwaytobetterintegrateinformationfromthirdparties.TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.

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