REV. EInformation furnished by Analog Devices is believed to be accurate andreliable. However, no responsibility is assumed by Analog Devices for itsuse, nor for any infringements of patents or other rights of third partieswhich may result from its use. No license is granted by implication orotherwise under any patent or patent rights of Analog Devices.aPrecisionInstrumentation AmplifierAD524FEATURESLow Noise: 0.3 ␮V p-p 0.1 Hz to 10 HzLow Nonlinearity: 0.003% (G = 1)High CMRR: 120 dB (G = 1000)Low Offset Voltage: 50 ␮VLow Offset Voltage Drift: 0.5 ␮V/ⴗCGain Bandwidth Product: 25 MHzPin Programmable Gains of 1, 10, 100, 1000Input Protection, Power On–Power OffNo External Components RequiredInternally CompensatedMIL-STD-883B and Chips Available16-Lead Ceramic DIP and SOIC Packages and 20-Terminal Leadless Chip Carriers AvailableAvailable in Tape and Reel in Accordance with EIA-481A StandardStandard Military Drawing Also AvailablePRODUCT DESCRIPTIONThe AD524 is a precision monolithic instrumentation amplifierdesigned for data acquisition applications requiring high accu-racy under worst-case operating conditions. An outstandingcombination of high linearity, high common mode rejection, lowoffset voltage drift and low noise makes the AD524 suitable foruse in many data acquisition systems.The AD524 has an output offset voltage drift of less than 25 µV/°C,input offset voltage drift of less than 0.5 µV/°C, CMR above90 dB at unity gain (120 dB at G = 1000) and maximum non-linearity of 0.003% at G = 1. In addition to the outstanding dcspecifications, the AD524 also has a 25 kHz gain bandwidthproduct (G = 1000). To make it suitable for high speed dataacquisition systems the AD524 has an output slew rate of 5 V/µsand settles in 15 µs to 0.01% for gains of 1 to 100.As a complete amplifier the AD524 does not require any exter-nal components for fixed gains of 1, 10, 100 and 1000. Forother gain settings between 1 and 1000 only a single resistor isrequired. The AD524 input is fully protected for both power-onand power-off fault conditions.The AD524 IC instrumentation amplifier is available in fourdifferent versions of accuracy and operating temperature range.The economical “A” grade, the low drift “B” grade and lowerdrift, higher linearity “C” grade are specified from –25°C to+85°C. The “S” grade guarantees performance to specificationover the extended temperature range –55°C to +125°C. Devicesare available in 16-lead ceramic DIP and SOIC packages and a20-terminal leadless chip carrier.PRODUCT HIGHLIGHTS1. The AD524 has guaranteed low offset voltage, offset voltagedrift and low noise for precision high gain applications.2. The AD524 is functionally complete with pin programmablegains of 1, 10, 100 and 1000, and single resistor program-mable for any gain.3. Input and output offset nulling terminals are provided forvery high precision applications and to minimize offset volt-age changes in gain ranging applications.4. The AD524 is input protected for both power-on and power-off fault conditions.5. The AD524 offers superior dynamic performance with a gainbandwidth product of 25 MHz, full power response of 75 kHzand a settling time of 15 µs to 0.01% of a 20 V step (G = 100).One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.Tel: 781/329-4700 World Wide Web Site: http://www.analog.comFax: 781/326-8703 © Analog Devices, Inc., 1999FUNCTIONAL BLOCK DIAGRAMAD52420kV–INPUTG = 10+INPUTG = 100G = 1000RG2RG14.44kV404V40VPROTECTION20kV20kV20kV20kV20kVSENSEREFERENCEVbVOUTPROTECTIONAD524A AD524B AD524C AD524SModel Min Typ Max Min Typ Max Min Typ Max Min Typ Max UnitsGAINGain Equation(External Resistor GainProgramming)Gain Range (Pin Programmable) 1 to 1000 1 to 1000 1 to 1000 1 to 1000Gain Error1G = 1 ⴞ0.05 ⴞ0.03 ⴞ0.02 ⴞ0.05 %G = 10 ⴞ0.25 ⴞ0.15 ⴞ0.1 ⴞ0.25 %G = 100 ⴞ0.5 ⴞ0.35 ⴞ0.25 ⴞ0.5 %G = 1000±2.0 ⴞ1.0 ⴞ0.5 ⴞ2.0 %NonlinearityG = 1 ±0.01 ± 0.005 ± 0.003 ± 0.01 %G = 10,100 ±0.01 ± 0.005 ± 0.003 ± 0.01 %G = 1000 ±0.01 ± 0.01 ± 0.01 ± 0.01 %Gain vs. TemperatureG = 1 5555ppm/°CG = 10 15 10 10 10 ppm/°CG = 100 35 25 25 25 ppm/°CG = 1000 100 50 50 50 ppm/°CVOLTAGE OFFSET (May be Nulled)Input Offset Voltage 250 100 50 100 µVvs. Temperature 2 0.75 0.5 2.0 µV/°COutput Offset Voltage 5 3 2.0 3.0 mVvs. Temperature 100 50 25 50 µV/°COffset Referred to theInput vs. SupplyG = 1 70 75 80 75 dBG = 10 85 95 100 95 dBG = 100 95 105 110 105 dBG = 1000 100 110 115 110 dBINPUT CURRENTInput Bias Current ⴞ50 ⴞ25 ⴞ15 ⴞ50 nAvs. Temperature ±100 ±100 ± 100 ± 100 pA/°CInput Offset Current ⴞ35 ⴞ15 ⴞ10 ⴞ35 nAvs. Temperature ±100 ±100 ± 100 ± 100 pA/°CINPUTInput ImpedanceDifferential Resistance 109109109109ΩDifferential Capacitance 10 10 10 10 pFCommon-Mode Resistance 109109109109ΩCommon-Mode Capacitance 10 10 10 10 pFInput Voltage RangeMax Differ. Input Linear (VDL)2±10 ±10 ± 10 ± 10 VMax Common-Mode Linear (VCM)VCommon-Mode Rejection dc to60 Hz with 1 kΩ Source ImbalanceG = 1 70 75 80 70 dBG = 10 90 95 100 90 dBG = 100 100 105 110 100 dBG = 1000 110 115 120 110 dBOUTPUT RATING VOUT, RL = 2 kΩ±10 ±10 ± 10 ± 10 VDYNAMIC RESPONSESmall Signal – 3 dBG = 1 1111MHzG = 10 400 400 400 400 kHzG = 100 150 150 150 150 kHzG = 1000 25 25 25 25 kHzSlew Rate 5.0 5.0 5.0 5.0 V/µsSettling Time to 0.01%, 20 V StepG = 1 to 100 15 15 15 15 µsG = 1000 75 75 75 75 µsNOISEVoltage Noise, 1 kHzR.T.I. 7777nV/√HzR.T.O. 90 90 90 90 nV√HzR.T.I., 0.1 Hz to 10 HzG = 1 15151515µV p-pG = 10 2222µV p-pG = 100, 1000 0.3 0.3 0.3 0.3 µV p-pCurrent Noise0.1 Hz to 10 Hz 60 60 60 60 pA p-pAD524–SPECIFICATIONS–2–REV. E(@ VS = ⴞ15 V, RL = 2 k⍀ and TA = +25ⴗC unless otherwise noted) 40, 000RG+ 1± 20% 12 V –G2× VD 12 V –G2× VD 12 V –G2× VD 12 V –G2× VD 40, 000RG+ 1± 20% 40, 000RG+ 1± 20% 40, 000RG+ 1± 20%AD524A AD524B AD524C AD524SModel Min Typ Max Min Typ Max Min Typ Max Min Typ Max UnitsSENSE INPUTRIN20 20 20 20 kΩ ±20%IIN15 15 15 15 µAVoltage Range ±10 ±10 ±10 ±10 VGain to Output l l 1 l %REFERENCE INPUTRIN40 40 40 40 kΩ ±20%IIN15 15 15 15 µAVoltage Range ±10 ±10 10 10 VGain to Output l 1 l 1 %TEMPERATURE RANGE Specified Performance –25 +85 –25 +85 –25 +85 –55 +125 °C Storage –65 +150