Single Supply, MicroPower Instrumentation …

1 1997 Burr-Brown CorporationPDS-1388 BPrinted in October, 1997100k 25k 25k 100k INA12254218376 RGVIN VIN+V+VORefV 200kRGG = 5 + VO = (VIN VIN) G + INA122 Single supply , MicroPowerINSTRUMENTATION AMPLIFIERFEATURESlLOW QUIESCENT CURRENT: 60 AlWIDE POWER supply RANGES ingle supply : to 36 VDual supply : + to 18 VlCOMMON-MODE RANGE TO (V ) OUTPUT SWINGlLOW OFFSET VOLTAGE: 250 V maxlLOW OFFSET DRIFT: 3 V/ C maxlLOW NOISE: 60nV/ HzlLOW INPUT BIAS CURRENT: 25nA maxl8-PIN DIP AND SO-8 SURFACE-MOUNTAPPLICATIONSlPORTABLE, BATTERY OPERATEDSYSTEMSlINDUSTRIAL SENSOR AMPLIFIER:Bridge, RTD, ThermocouplelPHYSIOLOGICAL AMPLIFIER:ECG, EEG, EMGlMULTI-CHANNEL DATA ACQUISITIONINA122 INA122 International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S.

2 Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111 Internet: FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132 DESCRIPTIONThe INA122 is a precision Instrumentation amplifierfor accurate, low noise differential signal two-op-amp design provides excellent performancewith very low quiescent current, and is ideal forportable Instrumentation and data acquisition INA122 can be operated with Single power sup-plies from to 36V and quiescent current is a mere60 A. It can also be operated from dual supplies. Byutilizing an input level-shift network, input common-mode range extends to below negative rail (singlesupply ground).

3 A Single external resistor sets gain from 5V/V to10000V/V. Laser trimming provides very low offsetvoltage (250 V max), offset voltage drift (3 V/ Cmax) and excellent common-mode options include 8-pin plastic DIP and SO-8surface-mount packages. Both are specified for the 40 C to +85 C extended industrial temperature INA122 SPECIFICATIONSAt TA = +25 C, VS = +5V, RL = 20k connected to VS/2, unless otherwise information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumesno responsibility for the use of this information, and all use of such information shall be entirely at the user s own risk. Prices and specifications are subject to changewithout notice.

4 No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrantany BURR-BROWN product for use in life support devices and/or , UINA122PA, UAPARAMETERCONDITIONSMINTYPMAXMINTYPMAXU NITSINPUTO ffset Voltage, RTI 100 250 150 500 Vvs Temperature 1 3[ 5 V/ Cvs Power supply (PSRR)VS = + to +36V1030[100 V/VInput Impedance1010 || 3[ || pFSafe Input VoltageRS = 0(V ) (V+)+ [[VRS = 10k (V ) 40(V+)+40[[VCommon-Mode Voltage [[VCommon-Mode RejectionVCM = 0V to BIAS CURRENT 10 25[ 50nAvs Temperature 40[pA/ COffset Current 1 2[ 5nAvs Temperature 40[pA/ CGAING = 5 to 10k[V/VGain EquationG = 5 + 200k /RG[V/VGain ErrorG = 5 [ TemperatureG = 5510[[ppm/ CGain ErrorG = 100 [ 1%vs TemperatureG = 100 25 100[[ppm/ CNonlinearityG = 100, VO = to + [ (RTI)]]]]]]]]]]]]]]]]]]]]]]

5 Voltage Noise, f = 1kHz60[nV/ Hzf = 100Hz100[nV/ Hzf = 10Hz110[nV/ HzfB = to 10Hz2[ Vp-pCurrent Noise, f = 1kHz80[fA/ HzfB = to 10Hz2[pAp-pOUTPUTV oltage, PositiveVS = 15V(V+) (V+) [[VNegativeVS = 15V(V )+ (V )+ [[VShort-Circuit CurrentShort-Circuit to Ground+3/ 30[mACapacitive Load Drive1[nFFREQUENCY RESPONSEB andwidth, 3dBG = 5120[kHzG = 1005[kHzG = [kHzSlew Rate+ [V/ sSettling Time, = 5350[ sG = 100450[ sG = [msOverload Recovery50% Input Overload3[ sPOWER SUPPLYV oltage Range, Single supply + +5+36[[[VDual Supplies + 18[[[VCurrentIO = 06085[[ ATEMPERATURE RANGES pecification 40+85[[ COperation 55+85[[ CStorage 55+125[[ CThermal Resistance, JA8-Pin DIP150[ C/WSO-8 Surface-Mount150[ C/W[ Specification same as INA122P, INA122 PIN CONFIGURATIONTop View8-Pin DIP, SO-8 supply Voltage, V+ to V.]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]

6 36 VSignal Input Terminals, Voltage(2).. (V ) to (V+)+ (2).. 5mAOutput Short Circuit .. ContinuousOperating Temperature .. 40 C to +125 CStorage Temperature .. 55 C to +125 CLead Temperature (soldering, 10s) .. +300 CNOTES: (1) Stresses above these ratings may cause permanent damage.(2) Input terminals are internally diode-clamped to the power supply signals that can exceed the supply rails by more than should becurrent-limited to 5mA or MAXIMUM RATINGS(1)PACKAGE INFORMATIONPACKAGE DRAWINGPRODUCTPACKAGENUMBER(1)INA122PA8- Pin DIP006 INA122P8-Pin DIP006 INA122 UASO-8 Surface Mount182 INA122 USO-8 Surface Mount182 NOTE: (1) For detailed drawing and dimension table, see end of data sheet, orAppendix C of Burr-Brown IC Data SENSITIVITYThis integrated circuit can be damaged by ESD.

7 Burr-Brownrecommends that all integrated circuits be handled with ap-propriate precautions. Failure to observe proper handling andinstallation procedures can cause damage can range from subtle performance degradationto complete device failure. Precision integrated circuits maybe more susceptible to damage because very small parametricchanges could cause the device not to meet its RGV+VORef12348765 +4 INA122 TYPICAL PERFORMANCE CURVESAt TA = +25 C and VS = 5V, unless otherwise vs FREQUENCY706050403020100 10 Gain (dB)Frequency (Hz)1001k10k100k1MG = 1000G = 100G = 20G = 5 COMMON-MODE REJECTION vs FREQUENCY1101009080706050403020100 Common-Mode Rejection (dB)Frequency (Hz)1101001k10k100kG = 1000G = 100G = 5 NEGATIVE POWER supply REJECTIONvs FREQUENCY100806040200 Power supply Rejection (dB)Frequency (Hz)1101001k10k100kG = 500G = 5G = 100 POSITIVE POWER supply REJECTIONvs FREQUENCY100806040200 Power supply Rejection (dB)Frequency (Hz)

8 101001k10k100k1MG = 500G = 100G = 5 INPUT COMMON-MODE RANGEvs OUTPUT VOLTAGE, VS = 15V, G = 5 Output Voltage (V)Common-Mode Voltage (V) 15 100515 5151050 5 10 1510VD/2++ VCMVOVD/2 Ref 15V+15V+Limited by A2 output swing see textINPUT COMMON-MODE VOLTAGEvs OUTPUT VOLTAGE, VS = 5V, G = 5 Output Voltage (V)Input Common-Mode Voltage (V) 5 45 3 2 101234543210 1 2 3 4 5 Limited by A2 output swing see textVS = 5 VVS = +5V/0 VVREF = = 0V5 INA122 TYPICAL PERFORMANCE CURVES (CONT)At TA = +25 C and VS = 5V, unless otherwise CURRENT vs TEMPERATURET emperature ( C)Quiescent Current ( A) 75 50 250255012575100806040200 SETTLING TIME vs GAINGain (V/V)Settling Time (ms) OFFSET VOLTAGE WARM-UPTime After Turn-On (ms)Offset Voltage Change ( V)01102345 67891086420 2 4 6 8 10(Noise)Turn-on time 1ms.

9 Settling time to final value depends on Gain see settling HARMONIC DISTORTION+NOISEvs FREQUENCYF requency (Hz)THD+N (%) = 5G = 100RL = RL = 25k VOLTAGE and CURRENT NOISE DENSITYvs FREQUENCY (RTI)100010010 Current Noise (fA/ Hz)Frequency (Hz)11010010k1k Voltage Noise (nV/ Hz)VNINOUTPUT VOLTAGE SWINGvs OUTPUT CURRENT0510152025 Output Current (mA)Output Voltage (V)Sourcing CurrentSinking CurrentV+(V+) 1(V+) 2(V )+2(V )+1V 6 INA122 TYPICAL PERFORMANCE CURVES (CONT)At TA = +25 C and VS = 5V, unless otherwise s/div100mV/divSMALL-SIGNAL STEP RESPONSEG = 5100 s/div100mV/divSMALL-SIGNAL STEP RESPONSEG = 10050 s/div2V/divLARGE-SIGNAL STEP RESPONSEG = 5500ms/div2 V/divINPUT-REFERRED NOISE to 10Hz7 INA122 APPLICATION INFORMATIONF igure 1 shows the basic connections required for operationof the INA122.

10 Applications with noisy or high impedancepower supplies may require decoupling capacitors close tothe device output is referred to the output reference (Ref) terminalwhich is normally grounded. This must be a low-impedanceconnection to ensure good common-mode rejection. A resis-tance of 10 in series with the Ref pin will cause a typicaldevice to degrade to approximately 80dB THE GAINGain of the INA122 is set by connecting a Single externalresistor, RG, as shown:(1)Commonly used gains and RG resistor values are shown inFigure 200k term in equation 1 comes from the internal metalfilm resistors which are laser trimmed to accurate absolutevalues. The accuracy and temperature coefficient of theseresistors are included in the gain accuracy and drift specifi-cations of the stability and temperature drift of the external gainsetting resistor, RG, also affects gain.