INA321 INA2321 microPower, Single-Supply, CMOS ...

1 FEATURESDLOW QUIESCENT CURRENT: 40 A/channelShut Down: < 1 ADHIGH GAIN ACCURACY: G = 5, ,2ppm/ CDGAIN SET WITH EXTERNAL RESISTORSDLOW OFFSET VOLTAGE: 200 VDHIGH CMRR: 94dBDLOW BIAS CURRENT: 10pADBANDWIDTH: 500kHz, G = 5V/VDRAIL-TO-RAIL OUTPUT SWING: (V+) TEMPERATURE RANGE: 55 C to +125 CDSINGLE VERSION IN MSOP-8 PACKAGE ANDDUAL VERSION IN TSSOP-14 PACKAGEDESCRIPTIONThe INA321 family is a series of rail-to-rail output, micropower cmos instrumentation amplifiers that offerwide-range, single - supply , as well as bipolar-supplyoperation. The INA321 family provides low-cost, low-noiseamplification of differential signals with micropowercurrent consumption of 40 A. When shutdown, theINA321 has a quiescent current of less than 1 to normal operations within microseconds, theshutdown feature makes the INA321 optimal forlow-power battery or multiplexing internally for 5V/V gain, the INA321 offersexceptional flexibility with user-programmable externalgain resistors.

2 The INA321 reduces common-mode errorover frequency and with CMRR remaining high up to 3kHz,line noise and line harmonics are low-power design does not compromise on bandwidthor slew rate, making the INA321 ideal for driving sampleAnalog-to-Digital (A/D) converters as well asgeneral-purpose applications. With high precision, lowcost, and small packaging, the INA321 outperformsdiscrete designs, while offering reliability SENSOR AMPLIFIERS:Bridge, RTD, Thermistor, PositionDPHYSIOLOGICAL AMPLIFIERS:ECG, EEG, EMGDA/D CONVERTER SIGNAL CONDITIONINGDDIFFERENTIAL LINE RECEIVERS WITH GAINDFIELD UTILITY METERSDPCMCIA CARDSDCOMMUNICATION SYSTEMSDTEST EQUIPMENTDAUTOMOTIVE INSTRUMENTATIONCMRR vs FREQUENCYF requency (Hz)CMRR (dB)1k1010010k120100806040 INA321 NearestCompetition10xImprovementA2A1A316 0k RE FVIN VIN+40k 40k ShutdownV+VOUTVOUT=(VIN+ VIN ) GainGain=5+5(R2/R1)V R2R1RG160k INA321 INA2321 SBOS168D DECEMBER 2000 REVISED JANUARY 2006microPower, single - supply , CMOSI nstrumentation 2000-2006, Texas Instruments IncorporatedPlease be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instrumentssemiconductor products and disclaimers thereto appears at the end of this data trademarks are the property of their respective owners.

3 ! ! "#$ #"#$ SBOS168D DECEMBER 2000 REVISED JANUARY MAXIMUM RATINGS(1) supply Voltage, V+ to V .. Signal Input Terminals Voltage(2)(V ) ( ) to (V+) + ( ).. Current(2)10mA.. Output Short-Circuit(3)Continuous.. Operating Temperature 65 C to +150 C.. Storage Temperature 65 C to +150 C.. Junction Temperature+150 C.. (1)Stresses above these ratings may cause permanent 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 signals that can swing more than beyond the supplyrails should be current limited to 10mA or less.(3)Short-circuit to ground, one amplifier per SENSITIVITYThis integrated circuit can be damaged by ESD. Texas Instrumentsrecommends that all integrated circuits be handled with appropriateprecautions.

4 Failure to observe proper handling and installationprocedures can cause 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 INFORMATION(1)PRODUCTPACKAGE-LEADPACKAGE DESIGNATORSPECIFIEDTEMPERATURERANGEPACKA GEMARKINGORDERINGNUMBERTRANSPORTMEDIA, QUANTITYSINGLEINA321 EMSOP-8 DGK 55 C to +125 CC21 INA321E/250 Tape and Reel, 250 INA321E/2K5 Tape and Reel, 2500 INA321 EAMSOP-8 DGK 55 C to +125 CC21 INA321EA/250 Tape and Reel, 250 INA321EA/2K5 Tape and Reel, 3000 DUALINA2321 EATSSOP-14PW 55 C to +125 CINA2321 EAINA2321EA/250 Tape and Reel, 250 INA2321EA/2K5 Tape and Reel, 2500(1)For the most current package and ordering information, see the Package Option Addendum located at the end of this data CONFIGURATIONSTop ViewRGVIN VIN+V ShutdownV+VOUTREFINA321 MSOP 8 (E, EA)

5 123487651234567141312111098 Shutdown AVOUTAREFAV+REFBVOUTBS hutdown BRGAVIN AVIN+AV VIN+BVIN BRGBINA2321 Dual, TSSOP 14 (EA) "#$ #"#$ SBOS168D DECEMBER 2000 REVISED JANUARY CHARACTERISTICS: VS = + to + BOLDFACE limits apply over the specified temperature range, TA = 555C to + TA = +25 C, RL = 25k , G = 25, and IA common = VS/2, unless otherwise Offset Voltage, RTIVS = +5V 1mVOver TemperatureVOS TemperaturedVOS/dT 7* V/ Cvs Power SupplyPSRRVS = + to + 50 200 V/VOver Temperature 220* V/VLong-Term Stability V/monthInput Impedance1013 || 3 || pFInput Common-Mode RangeVS = VVS = VCommon-ModeRejectionCMRRVS = 5V, VCM = to dBOver TemperatureVS = 5V, VCM = to = , VCM = to dBCrosstalk, Dual110 dBINPUT BIAS CURRENTBias CurrentIB 10 pAOffset CurrentIOS 10 pANOISE, RTIenRS = 0 Voltage Noise: f = 10Hz500 nV/ Hzf = 100Hz190 nV/ Hzf = 1kHz100 nV/ Hzf = to 10Hz20 VPPC urrent Noise: f = 1kHz3 fA/ HzGAIN(1)Gain Equation, Externally SetG > 5G = 5 + 5 (R2/R1) Range of Gain51000 V/VGain Error %vs TemperatureG = 5 2 10**ppm/ CNonlinearityG = 25, VS = 5V, VO = to % of FSOver Temperature **% of FSOUTPUTO utput Voltage Swing from Rail(2, 5)G 105025 mVOver Temperature50*mVCapacitance Load DriveSee Typical Characteristic(3) pFShort-Circuit Current+ISC8 ISC16 mANOTE: Specification is same as INA321E.

6 (1)Does not include errors from external gain setting resistors.(2)Output voltage swings are measured between the output and power- supply rails.(3)See typical characteristic Percent Overshoot vs Load Capacitance.(4)See typical characteristic Shutdown Voltage vs supply Voltage.(5)Output does not swing to positive rail if gain is less than 10. "#$ #"#$ SBOS168D DECEMBER 2000 REVISED JANUARY CHARACTERISTICS: VS = + to + (continued)BOLDFACE limits apply over the specified temperature range, TA = 555C to + TA = +25 C, RL = 25k , G = 25, and IA common = VS/2, unless otherwise RESPONSEB andwidth, 3dBBWG = 5500 kHzSlew RateSR VS = 5V, G = V/ sSettling Time, = 5, CL = 50pF, VO = 2V step8 sOverload Recovery50% Input Overload G = 252 sPOWER SUPPLYS pecified Voltage Range+ + VOperating Voltage Range+ to + VQuiescent CurrentIQper Channel, VSD > (4)4060 AOver Temperature70* AShutdown Quiescent CurrentISDper Channel, VSD > (4) ATEMPERATURE RANGES pecified Range 55+125 COperating/Storage Range 65+150 CThermal ResistanceqJAMSOP-8, TSSOP-14 Surface-Mount150 C/WNOTE: Specification is same as INA321E.

7 (1)Does not include errors from external gain setting resistors.(2)Output voltage swings are measured between the output and power- supply rails.(3)See typical characteristic Percent Overshoot vs Load Capacitance.(4)See typical characteristic Shutdown Voltage vs supply Voltage.(5)Output does not swing to positive rail if gain is less than 10. "#$ #"#$ SBOS168D DECEMBER 2000 REVISED JANUARY CHARACTERISTICS At TA = +25 C, VS = 5V, VCM =1/2VS, RL = 25k , and CL = 50pF, unless otherwise vs FREQUENCY10 Gain (dB)Frequency (Hz)1001k10k100k1M10M80706050403020100 10 20 Gain = 500 Gain = 100 Gain = 25 Gain = 5 COMMON MODE REJECTION RATIOvs FREQUENCY10 CMRR (dB)Frequency (Hz)1001k10k100k120100806040200 POWER supply REJECTION RATIOvs FREQUENCY1 PSRR (dB)Frequency (Hz)101001k10k100k1009080706050403020100 MAXIMUM OUTPUT VOLTAGE vs FREQUENCY100 Maximum Output Voltage (VPP)Frequency (Hz)1k10k100k1M10M6543210VS= vs FREQUENCY1 VNOISE(nV/ Hz)Frequency (Hz) (fA/ Hz) TO 10Hz VOLTAGE NOISE1s/div10 v/div "#$ #"#$ SBOS168D DECEMBER 2000 REVISED JANUARY CHARACTERISTICS (continued)At TA = +25 C, VS = 5V, VCM =1/2VS, RL = 25k , and CL = 50pF, unless otherwise Positive RailTo Negative RailOUTPUT SWING vs LOAD RESISTANCE0 Swing to Rail (mV)RLOAD( )

8 20k40k60k80k100k2520151050 COMMON MODE INPUT RANGEvs REFERENCE VOLTAGE0 Output Referred to Ground (V)Input Common Mode Voltage (V)123456543210 Outside of Normal OperationREFI ncreasingQUIESCENT CURRENT AND SHUTDOWN CURRENTvs POWER SUPPLYIQ( A)ISD(nA) supply Voltage (V) CURRENT AND SHUTDOWN CURRENTvs TEMPERATURE 75IQ( A)6005004003002001000 ISD(nA)Temperature (_C) 50 2502550751001251506055504540353025201510 50 IQISDSHORT CIRCUIT CURRENT vs POWER SUPPLYISC(mA) supply Voltage (V) +ISC SHORT CIRCUIT CURRENT vs TEMPERATURE 75 ISC(mA)Temperature (_C) 50 250255075100125150302520151050 ISC+ISC "#$ #"#$ SBOS168D DECEMBER 2000 REVISED JANUARY CHARACTERISTICS (continued)At TA = +25 C, VS = 5V, VCM =1/2VS, RL = 25k , and CL = 50pF, unless otherwise SIGNAL STEP RESPONSE (G = 5)10 s/div100mV/divSMALL SIGNAL STEP RESPONSE (G = 100)50 s/div50mV/divSMALL SIGNAL STEP RESPONSE(G = 5, CL= 1000pF)10 s/div100mV/divSMALL SIGNAL STEP RESPONSE(G = 100, CL= 1000pF)50 s/div50mV/divSMALL SIGNAL STEP RESPONSE(G = 100, CL= 5000pF)50 s/div50mV/div50 s/div1V/divLARGE SIGNAL STEP RESPONSE(G = 25, CL=50pF) "#$ #"#$ SBOS168D DECEMBER 2000 REVISED JANUARY CHARACTERISTICS (continued)At TA = +25 C, VS = 5V, VCM =1/2VS, RL = 25k , and CL = 50pF, unless otherwise TIME vs GAIN1101001000 Gain (V/V)Settling Time ( s)1009080706050403020100 Output 2 VPPD ifferentialInput OVERSHOOT vs LOAD CAPACITANCE101001k10kLoad Capacitance (pF)Overshoot (%)6050403020100 Output 100mVPPD ifferentialInput DriveG=5G=25 SHUTDOWN VOLTAGE vs supply (V) supply Voltage (V) Operation ModePart Draws Below 1 A Quiescent CurrentOperation in this Regionis not RecommendedShutdown ModeSHUTDOWN TRANSIENT BEHAVIOR50 s/div1V/divVSDVOUT2520151050 Voltage (mV)Percentage of Amplifiers (%)

9 OFFSET VOLTAGE PRODUCTION DISTRIBUTION20181614121086420 20 18 16 14 12 10 8 6 4 202468101214161820 Offset Voltage Drift ( V/_C)Percentage of Amplifiers (%)OFFSET VOLTAGE DRIFTPRODUCTION DISTRIBUTION "#$ #"#$ SBOS168D DECEMBER 2000 REVISED JANUARY CHARACTERISTICS (continued)At TA = +25 C, VS = 5V, VCM =1/2VS, RL = 25k , and CL = 50pF, unless otherwise RATE vs TEMPERATURESlew Rate (V/ s)Temperature (_C) 7525 50 BIAS CURRENT vs TEMPERATURE 75 50 250255075100125150 Temperature (_C)Input Bias Current (pA) vs (Hz)Crosstalk (dB)120100806040200 OUTPUT VOLTAGE SWING vs OUTPUT CURRENT0 2 4 6 8 1012141618202224 Output Current (mA)Output Voltage (V)543210 55_C 55_C+125 C+25 C+125 C+25 C "#$ #"#$ SBOS168D DECEMBER 2000 REVISED JANUARY INFORMATIONThe INA321 is a modified version of the classic two op ampinstrumentation amplifier, with an additional gain 1 shows the basic connections for the operation ofthe INA321 and INA2321 .

10 The power supply should becapacitively decoupled with F capacitors as close tothe INA321 as possible for noisy or output is referred to the reference terminal, whichmust be at least below the positive supply VOLTAGEThe INA321 family is fully specified over a supply range of+ to + , with key parameters assured over thetemperature range of 55 C to +125 C. Parameters thatvary significantly with operating conditions, such as loadconditions or temperature, are shown in the INA321 may be operated on a single supply . Figure 2shows a bridge amplifier circuit operated from a single +5 Vsupply. The bridge provides a small differential voltageriding on an input common-mode 40k 40k 160k 3251784 Also drawn in simplified FRGVIN VIN+V V+A1A3A2VO=((VIN+) (VIN )) GShort VOUTto RGfor G = 551050100 SHORT100k 90k 190k OPEN100k 10k 10k R2R1 Shutdown(For SingleSupply)DESIRED GAIN(V/V)R1R2G=5+5(R2/R1)INA321532 VOUT87641V+ShutdownRGVIN V VIN+REFF igure 1.