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MSU PHY 440 - AD624_c

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REV. CInformation 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.aAD624One 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., 1999PrecisionInstrumentation AmplifierPRODUCT DESCRIPTIONThe AD624 is a high precision, low noise, instrumentationamplifier designed primarily for use with low level transducers,including load cells, strain gauges and pressure transducers. Anoutstanding combination of low noise, high gain accuracy, lowgain temperature coefficient and high linearity make the AD624ideal for use in high resolution data acquisition systems.The AD624C has an input offset voltage drift of less than0.25 µV/°C, output offset voltage drift of less than 10 µV/°C,CMRR above 80 dB at unity gain (130 dB at G = 500) and amaximum nonlinearity of 0.001% at G = 1. In addition to theseoutstanding dc specifications, the AD624 exhibits superior acperformance as well. A 25 MHz gain bandwidth product, 5 V/µsslew rate and 15 µs settling time permit the use of the AD624 inhigh speed data acquisition applications.The AD624 does not need any external components for pre-trimmed gains of 1, 100, 200, 500 and 1000. Additional gainssuch as 250 and 333 can be programmed within one percentaccuracy with external jumpers. A single external resistor canalso be used to set the 624’s gain to any value in the range of 1to 10,000.PRODUCT HIGHLIGHTS1. The AD624 offers outstanding noise performance. Inputnoise is typically less than 4 nV/√Hz at 1 kHz.2. The AD624 is a functionally complete instrumentation am-plifier. Pin programmable gains of 1, 100, 200, 500 and 1000are provided on the chip. Other gains are achieved throughthe use of a single external resistor.3. The offset voltage, offset voltage drift, gain accuracy and gaintemperature coefficients are guaranteed for all pretrimmedgains.4. The AD624 provides totally independent input and outputoffset nulling terminals for high precision applications.This minimizes the effect of offset voltage in gain rangingapplications.5. A sense terminal is provided to enable the user to minimizethe errors induced through long leads. A reference terminal isalso provided to permit level shifting at the output.FEATURESLow Noise: 0.2 ␮V p-p 0.1 Hz to 10 HzLow Gain TC: 5 ppm max (G = 1)Low Nonlinearity: 0.001% max (G = 1 to 200)High CMRR: 130 dB min (G = 500 to 1000)Low Input Offset Voltage: 25 ␮V, maxLow Input Offset Voltage Drift: 0.25 ␮V/ⴗC maxGain Bandwidth Product: 25 MHzPin Programmable Gains of 1, 100, 200, 500, 1000No External Components RequiredInternally CompensatedFUNCTIONAL BLOCK DIAGRAM225.3V124V4445.7V80.2V50VVB50V20kV 10kV10kV10kVAD624–INPUTG = 100G = 200G = 500RG1RG2+INPUTSENSEOUTPUTREF20kV 10kVREV. C–2–AD624–SPECIFICATIONSModel AD624A AD624B AD624C AD624SMin Typ Max Min Typ Max Min Typ Max Min Typ Max UnitsGAINGain Equation(External Resistor GainProgramming) 40, 000RG+ 1± 20% 40, 000RG+ 1± 20% 40, 000RG+ 1± 20% 40, 000RG+ 1± 20%Gain Range (Pin Programmable) 1 to 1000 1 to 1000 1 to 1000 1 to 1000Gain ErrorG = 1±0.05±0.03±0.02±0.05 %G = 100±0.25±0.15±0.1±0.25 %G = 200, 500±0.5±0.35±0.25±0.5 %NonlinearityG = 1 ±0.005 ±0.003 ±0.001 ±0.005 %G = 100, 200 ±0.005 ±0.003 ±0.001 ±0.005 %G = 500 ±0.005 ±0.005 ±0.005 ±0.005 %Gain vs. TemperatureG = 1 5555ppm/°CG = 100, 200 10 10 10 10 ppm/°CG = 500 25 15 15 15 ppm/°CVOLTAGE OFFSET (May be Nulled)Input Offset Voltage 200 75 25 75 µVvs. Temperature 2 0.5 0.25 2.0 µV/°COutput Offset Voltage 5323mVvs. Temperature 50 25 10 50 µV/°COffset Referred to the Input vs. SupplyG = 1 70 75 80 75 dBG = 100, 200 95 105 110 105 dBG = 500 100 110 115 110 dBINPUT CURRENTInput Bias Current±50±25±15±50 nAvs. Temperature ±50 ±50 ±50 ±50 pA/°CInput Offset Current±35±15±10±35 nAvs. Temperature ±20 ±20 ±20 ±20 pA/°CINPUTInput ImpedanceDifferential Resistance 109109109109ΩDifferential Capacitance 10 10 10 10 pFCommon-Mode Resistance 109109109109ΩCommon-Mode Capacitance 10 10 10 10 pFInput Voltage Range1Max Differ. Input Linear (VDL) ±10 ± 10 ± 10 ± 10 VMax Common-Mode Linear (VCM) 12 V −G2× VD 12 V −G2× VD 12 V −G2× VD 12 V −G2× VDVCommon-Mode Rejection dcto 60 Hz with 1 kΩ Source ImbalanceG = 1 70 75 80 70 dBG = 100, 200 100 105 110 100 dBG = 500 110 120 130 110 dBOUTPUT RATINGVOUT, RL = 2 kΩ±10 ± 10 ± 10 ± 10 VDYNAMIC RESPONSESmall Signal –3 dBG = 1 1111MHzG = 100 150 150 150 150 kHzG = 200 100 100 100 100 kHzG = 500 50 50 50 50 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 200 15 15 15 15 µsG = 500 35 35 35 35 µsG = 1000 75 75 75 75 µsNOISEVoltage Noise, 1 kHzR.T.I. 4 4 4 4 nV/√HzR.T.O. 75 75 75 75 nV/√HzR.T.I., 0.1 Hz to 10 HzG = 1 10101010µV p-pG = 100 0.3 0.3 0.3 0.3 µV p-pG = 200, 500, 1000 0.2 0.2 0.2 0.2 µV p-pCurrent Noise0.1 Hz to 10 Hz 60 60 60 60 pA p-pSENSE INPUTRIN8 10 12 8 10 12 8 10 12 8 10 12 kΩIIN30 30 30 30 µAVoltage Range ±10 ±10 ±10 ±10 VGain to Output 1 1 1 1 %(@ VS = ⴞ15 V, RL = 2 k⍀ and TA = +25ⴗC, unless otherwise noted)REV. C –3–AD624Model AD624A AD624B AD624C AD624SMin Typ Max Min Typ Max Min Typ Max Min Typ Max UnitsREFERENCE INPUTRIN16 20 24 16 20 24 16 20 24 16 20 24 kΩIIN30 30 30 30 µAVoltage Range ±10 ±10 ±10 ±10 VGain to Output 1 1 1 1 %TEMPERATURE RANGESpecified Performance –25 +85 –25 +85 –25 +85 –55 +125 °CStorage –65 +150 –65 +150 –65 +150 –65 +150 °CPOWER SUPPLYPower Supply Rangeⴞ6ⴞ15ⴞ18ⴞ6ⴞ15ⴞ18ⴞ6ⴞ15ⴞ18ⴞ6ⴞ15ⴞ18 VQuiescent Current 3.5 5 3.5 5 3.5 5 3.5 5 mANOTES1VDL is the maximum differential input voltage at G = 1 for specified nonlinearity, VDL at other gains = 10 V/G. VD = actual differential input voltage.1Example: G = 10, VD = 0.50. VCM = 12 V – (10/2 × 0.50 V) = 9.5 V.Specifications subject to change without notice.Specifications shown in boldface are tested on all production unit at final electrical test. Results from


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MSU PHY 440 - AD624_c

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