FEATURES DESCRIPTIO U - analog.com

1 1 LTC1050 1050fb +78131416171141/2 LTC10435 VCS1 FCH1 FR1 CMRR > 120dB AT DCCMRR > 120dB AT 60 HzDUAL SUPPLY OR SINGLE 5 VGAIN = 1 + R2/R1 VOS = 5 VCOMMON MODE INPUT VOLTAGE EQUALS THE SUPPLIESR21050 TA01 5V1 F 5V5V47326 VOUTLTC1050 Precision Zero-DriftOperational Amplifierwith Internal Capacitors No External Components Required Noise Tested and Guaranteed Low Aliasing Errors Maximum Offset Voltage: 5 V Maximum Offset Voltage Drift: V/ C Low Noise: VP-P ( to 10Hz) Minimum Voltage Gain: 130dB Minimum PSRR: 125dB Minimum CMRR: 120dB Low Supply Current: 1mA Single Supply Operation: to 16V Input Common Mode Range Includes Ground Output Swings to Ground Typical Overload Recovery Time: 3msThe LTC 1050 is a high performance, low cost zero-driftoperational amplifier.

2 The unique achievement of theLTC1050 is that it integrates on-chip the two sample-and-hold capacitors usually required externally by other chop-per amplifiers. Further, the LTC1050 offers better com-bined overall DC and AC performance than is availablefrom other chopper stabilized amplifiers with or withoutinternal sample-and-hold LTC1050 has an offset voltage of V, drift V/ C, DC to 10Hz, input noise voltage of VP-Pand a typical voltage gain of 160dB. The slew rate of 4V/ sand a gain bandwidth product of are achieved withonly 1mA of supply recovery times from positive and negative satu-ration conditions are and 3ms respectively, whichrepresents an improvement of about 100 times over chop-per amplifiers using external capacitors.

3 Pin 5 is an optionalexternal clock input, useful for synchronization LTC1050 is available in standard 8-pin metal can,plastic and ceramic dual-in-line packages as well as anSO-8 package. The LTC1050 can be an improved plug-inreplacement for most standard op amps. Thermocouple Amplifiers Electronic Scales Medical Instrumentation Strain Gauge Amplifiers High Resolution Data Acquisition DC Accurate RC Active FiltersHigh Performance, Low Cost Instrumentation AmplifierNoise SpectrumFEATURESDESCRIPTIOUAPPLICATIO SUTYPICAL APPLICATIOUFREQUENCY (Hz)40 VOLTAGE NOISE DENSITY (nV/ Hz)80100140160101k10k100k1050 TA0201001206020, LTC and LT are registered trademarks of Linear Technology 1050fbORDER PARTNUMBERAUGWAWUWARBSOLUTEXITISO perating Temperature RangeLTC1050AC/C.

4 40 C to 85 CLTC1050H .. 40 C to 125 CLTC1050AM/M (OBSOLETE).. 55 C to 125 CTotal Supply Voltage (V+ to V ).. 18 VInput Voltage .. (V+ + ) to (V )Output Short-Circuit Duration .. IndefiniteStorage Temperature Range .. 65 C to 150 CLead Temperature (Soldering, 10 sec) .. 300 CWUUPACKAGE/ order I FOR ATIOLTC1050 ACHLTC1050 CHLTC1050 AMHLTC1050 MHORDER PARTNUMBER10501050 HTJMAX = 150 C(Note 1)TOP VIEWV+ (CASE)NCNC INOUTEXT CLOCKINPUT+INV 87653214H PACKAGE8-LEAD TO-5 METAL CANS8 PART MARKINGLTC1050CS8 LTC1050HS812348765 TOP VIEWNCV+OUTEXT CLOCKINPUTNC IN+INV S8 PACKAGE8-LEAD PLASTIC SO +TJMAX = 150 C, JA = 150 C/W12348765 TOP VIEWNC IN+INV NCV+OUTEXT CLOCKINPUTN8 PACKAGE8-LEAD PDIP1234567 TOP VIEWN PACKAGE14-LEAD PDIP141312111098 NCNCNC IN+INNCV NCNCNCV+OUTNCNCTJMAX = 150 C, JA = 70 C/WTJMAX = 150 C, JA = 100 C/WORDER PARTNUMBERLTC1050 ACN8 LTC1050CN8 order PARTNUMBERLTC1050 CNConsult LTC Marketing for parts specified with wider operating temperature PACKAGE 8-LEAD CERDIPTJMAX = 150 C.

5 JA = 100 C/WLTC1050 ACJ8 LTC1050CJ8 LTC1050 AMJ8 LTC1050MJ8 OBSOLETE PACKAGEOBSOLETE PACKAGEELECTRICAL CCHARA TERISTICSLTC1050 AMLTC1050 ACPARAMETERCONDITIONSMINTYPMAXMINTYPMAXU NITSI nput Offset Voltage(Note 3) 5 5 VAverage Input Offset Drift(Note 3) V/ CLong Term Offset Voltage Drift5050nV/ MoInput Offset Current(Note 5) 20 60 20 60pA 300 150pAInput Bias Current(Note 5) 10 30 10 30pA 2000 100pAInput Noise to 10Hz (Note 6) VP-PDC to VP-PThe denotes specifications which apply over the full operating temperaturerange, otherwise specifications are at TA = 25 C. VS = 5 VConsider the N8 Package for Alternate Source3 LTC1050 1050fbELECTRICAL CCHARA TERISTICSLTC1050 AMLTC1050 ACPARAMETERCONDITIONSMINTYPMAXMINTYPMAXU NITSI nput Noise Currentf = 10Hz (Note 4) HzCommon Mode Rejection RatioVCM = V to 110110dBPower Supply Rejection RatioVS = to 8V 125140125140dBLarge-Signal Voltage GainRL = 10k, VOUT = 4V 130160130160dBMaximum Output Voltage SwingRL = 10k = 100k RateRL = 10k, CL = 50pF44V/ sGain Bandwidth CurrentNo Sampling denotes specifications which apply over the full operating temperaturerange, otherwise specifications are at TA = 25 C.

6 VS = 5 VThe denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 = 5 VLTC1050M/HLTC1050 CPARAMETERCONDITIONSMINTYPMAXMINTYPMAXUN ITSI nput Offset Voltage(Note 3) 5 5 VAverage Input Offset Drift(Note 3) V/ CLong Term Offset Voltage Drift5050nV/ MoInput Offset Current(Note 5) 20 100 20 125pA 300 200pAInput Bias Current(Note 5) 10 50 10 75pA 2000 150pAInput Noise VoltageRS = 100 , to 10Hz (Note 6) VP-PRS = 100 , DC to VP-PInput Noise Currentf = 10Hz (Note 4) HzCommon Mode Rejection RatioVCM = V to 110110dBLTC1050H 100dBPower Supply Rejection RatioVS = to 8V, LTC1050M/C 120140120140dBLTC1050H 110dBLarge-Signal Voltage GainRL = 10k, VOUT = 4V 120160120160dBMaximum Output Voltage SwingRL = 10k = 100k RateRL = 10k, CL = 50pF44V/ sGain Bandwidth CurrentNo Sampling 1: Absolute Maximum Ratings are those values beyond which the lifeof the device may be 2: Connecting any terminal to voltages greater than V+ or less thanV may cause destructive latchup.

7 It is recommended that no sourcesoperating from external supplies be applied prior to power-up of 3: These parameters are guaranteed by design. Thermocouple effectspreclude measurement of these voltage levels in high speed automatic testsystems. VOS is measured to a limit determined by test 4: Current Noise is calculated from the formula: In = (2q Ib)where q = 10 19 5: At TA 0 C these parameters are guaranteed by design and 6: Every lot of LTC1050AM and LTC1050AC is 100% tested forBroadband Noise at 1kHz and sample tested for Input Noise Voltage to 1050fbCCHARA TERISTICSUWATYPICALPERFORCEO ffset Voltagevs Sampling Frequency10 HzP-P Noisevs Sampling FrequencyCommon Mode Input Rangevs Supply VoltageSupply Current vs TemperatureSupply Current vs Supply VoltageShort-Circuit Output Currentvs Supply VoltageSAMPLING FREQUENCY, fS (kHz) VOLTAGE ( V) = 5 VSAMPLING FREQUENCY, fS (Hz)100010Hz PEAK-TO-PEAK NOISE ( V)2481k10k1050 G0261375VS = 5 VSUPPLY VOLTAGE (V)0 COMMON MODE RANGE (V)04 81050 G03 4 8 2 4 6 1 3 5 78 22 66 VCM = V Sampling Frequencyvs Supply VoltageSampling Frequencyvs TemperatureOverload RecoveryTOTAL SUPPLY VOLTAGE, V+ TO V (V) FREQUENCY, fS (kHz)

8 G041416TA = 25 C AMBIENT TEMPERATURE, TA ( C) 500 SAMPLING FREQUENCY, fS (kHz)25050751050 G05143 2525100125VS = 5 VTOTAL SUPPLY VOLTAGE, V+ TO V (V)40 SUPPLY CURRENT, IS (mA) = 25 CAMBIENT TEMPERATURE, TA ( C) 500 SUPPLY CURRENT, IS (mA) 2525100125VS = 5 VTOTAL SUPPLY VOLTAGE, V+ TO V (V)4 30 SHORT-CIRCUIT OUTPUT CURRENT, IOUT (mA) 20 100266810121050 G0914164 ISOURCEVOUT = V ISINKVOUT = V+200mV0V0V 5 VINPUTOUTPUTAV = = 5V1050 G65 LTC1050 1050fbCCHARA TERISTICSUWATYPICALPERFORCEGain/Phase vs FrequencyFREQUENCY (Hz)0 VOLTAGE GAIN (dB)PHASE SHIFT (DEGREES)206010012010010k100k10M1050 G10 201k1M8040 401801601208060200100140220 PHASEGAINVS = 5 VTA = 25 CCL = 100pFRL 1kSmall-Signal Transient ResponseLarge-Signal Transient ResponseLTC1050 DC to 1Hz V10 SEC1050 G13 LTC1050 DC to 10Hz Noise1 V1 SEC1050 G14100mVSTEPAV = 1RL = 10kCL = 100pFVS = 5V1050 G112 VAV = 1RL = 10kCL = 100pFVS = 5V1050 G12 VOUTVIN = 6V6 LTC1050 1050fbUSAOPPLICATIWUUIFORATIOACHIEVING PICOAMPERE/MICROVOLTPERFORMANCEP icoamperesIn order to realize the picoampere level of accuracy of theLTC1050, proper care must be exercised.

9 Leakage currentsin circuitry external to the amplifier can significantly degradeperformance. High quality insulation should be used ( ,Teflon, Kel-F); cleaning of all insulating surfaces to removefluxes and other residues will probably be necessary particularly for high temperature performance. Surfacecoating may be necessary to provide a moisture barrier inhigh humidity leakage can be minimized by encircling the inputconnections with a guard ring operated at a potential closeto that of the inputs: in inverting configurations the guardring should be tied to ground; in noninverting connectionsto the inverting input (see Figure 1). Guarding both sidesof the printed circuit board is required. Bulk leakage reduc-tion depends on the guard ring effect must be considered if the LTC1050 sultralow drift is to be fully utilized.

10 Any connection of dis-similar metals forms a thermoelectric junction producingan electric potential which varies with temperature (Seebeckeffect). As temperature sensors, thermocouples exploit thisphenomenon to produce useful information. In low driftamplifier circuits the effect is a primary source of , switches, relay contacts, sockets, resistors,solder and even copper wire are all candidates for thermalTEST CIRCUITS +LTC1050 OUTPUT1050 TC01V+1k1M67234 RLV +LTC1050 +LT 10121050 TC0210 FFOR 1Hz NOISE BW, INCREASE ALL THE CAPACITORS BY A FACTOR FTO X-YRECORDERE lectrical Characteristics Test CircuitDC-10Hz Noise Test CircuitEMF generation. Junctions of copper wire from differentmanufacturers can generate thermal EMFs of 200nV/ C 4 times the maximum drift specification of the copper/kovar junction, formed when wire or printedcircuit traces contact a package lead, has a thermal EMF ofapproximately 35 V/ C 700 times the maximum driftspecification of the thermal EMF-induced errors is possible if ju-dicious attention is given to circuit board layout andcomponent selection.