Precision a Instrumentation Amplifier AD624 FUNCTIONAL BLOCK DIAGRAM FEATURES Low Noise: 0.2 V p-p 0.1 Hz to 10 Hz Low Gain TC: 5 ppm max (G = 1) 50 INPUT Low Nonlinearity: 0.001% max (G = 1 to 200) High CMRR: 130 dB min (G = 500 to 1000) G = 100 AD624 225.3 Low Input Offset Voltage: 25 V, max G = 200 4445.7 Low Input Offset Voltage Drift: 0.25 V/ C max 124 V Gain Bandwidth Product: 25 MHz B 10k G = 500 SENSE Pin Programmable Gains of 1, 100, 200, 500, 1000 80.2 20k 10k No External Components Required RG 1 OUTPUT 20k 10k Internally Compensated RG 2 10k REF 50 +INPUT PRODUCT DESCRIPTION PRODUCT HIGHLIGHTS The AD624 is a high precision, low noise, instrumentation 1. The AD624 offers outstanding noise performance. Input amplifier designed primarily for use with low level transducers, noise is typically less than 4 nV/Hz at 1 kHz. including load cells, strain gauges and pressure transducers. An 2. The AD624 is a functionally complete instrumentation am- outstanding combination of low noise, high gain accuracy, low plifier. Pin programmable gains of 1, 100, 200, 500 and 1000 gain temperature coefficient and high linearity make the AD624 are provided on the chip. Other gains are achieved through ideal for use in high resolution data acquisition systems. the use of a single external resistor. The AD624C has an input offset voltage drift of less than 3. The offset voltage, offset voltage drift, gain accuracy and gain 0.25 V/C, output offset voltage drift of less than 10 V/C, temperature coefficients are guaranteed for all pretrimmed CMRR above 80 dB at unity gain (130 dB at G = 500) and a gains. maximum nonlinearity of 0.001% at G = 1. In addition to these 4. The AD624 provides totally independent input and output outstanding dc specifications, the AD624 exhibits superior ac offset nulling terminals for high precision applications. performance as well. A 25 MHz gain bandwidth product, 5 V/ s This minimizes the effect of offset voltage in gain ranging slew rate and 15 s settling time permit the use of the AD624 in applications. high speed data acquisition applications. 5. A sense terminal is provided to enable the user to minimize The AD624 does not need any external components for pre- the errors induced through long leads. A reference terminal is trimmed gains of 1, 100, 200, 500 and 1000. Additional gains also provided to permit level shifting at the output. such as 250 and 333 can be programmed within one percent accuracy with external jumpers. A single external resistor can also be used to set the 624s gain to any value in the range of 1 to 10,000. REV. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or Tel: 781/329-4700 www.analog.com otherwise under any patent or patent rights of Analog Devices. Fax: 781/326-8703 Analog Devices, Inc., 1999AD624SPECIFICATIONS ( V = 15 V, R = 2 k and T = +25 C, unless otherwise noted) S L A Model AD624A AD624B AD624C AD624S Min Typ Max Min Typ Max Min Typ Max Min Typ Max Units GAIN Gain Equation (External Resistor Gain Programming) 40,000 40,000 40,000 40,000 + 1 20% + 1 20% + 1 20% + 1 20% R R R R G G G G Gain Range (Pin Programmable) 1 to 1000 1 to 1000 1 to 1000 1 to 1000 Gain Error G = 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 % Nonlinearity G = 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. Temperature G = 1 5 5 5 5 ppm/C G = 100, 200 10 10 10 10 ppm/C G = 500 25 15 15 15 ppm/C VOLTAGE OFFSET (May be Nulled) Input Offset Voltage 200 75 25 75 V vs. Temperature 2 0.5 0.25 2.0 V/C Output Offset Voltage 532 3 mV vs. Temperature 50 25 10 50 V/C OUT Offset Referred to the Input vs. Supply G = 1 70 75 80 75 dB G = 100, 200 95 105 110 105 dB G = 500 100 110 115 110 dB INPUT CURRENT Input Bias Current 50 25 15 50 nA vs. Temperature 50 50 50 50 pA/C Input Offset Current 35 15 10 35 nA vs. Temperature 20 20 20 20 pA/C INPUT Input Impedance 9 9 9 9 Differential Resistance 10 10 10 10 Differential Capacitance 10 10 10 10 pF 9 9 9 9 Common-Mode Resistance 10 10 10 10 Common-Mode Capacitance 10 10 10 10 pF 1 Input Voltage Range Max Differ. Input Linear (V ) 10 10 10 10 V DL G G G G 12 V V 12 V V 12 V V 12 V V Max Common-Mode Linear (V ) D D D D V CM 2 2 2 2 Common-Mode Rejection dc to 60 Hz with 1 k Source Imbalance G = 1 70 75 80 70 dB G = 100, 200 100 105 110 100 dB G = 500 110 120 130 110 dB OUTPUT RATING V , R = 2 k 10 10 10 10 V L DYNAMIC RESPONSE Small Signal 3 dB G = 1 111 1 MHz G = 100 150 150 150 150 kHz G = 200 100 100 100 100 kHz G = 500 50 50 50 50 kHz G = 1000 25 25 25 25 kHz Slew Rate 5.0 5.0 5.0 5.0 V/ s Settling Time to 0.01%, 20 V Step G = 1 to 200 15 15 15 15 s G = 500 35 35 35 35 s G = 1000 75 75 75 75 s NOISE Voltage Noise, 1 kHz R.T.I. 4 4 4 4 nV/Hz R.T.O. 75 75 75 75 nV/Hz R.T.I., 0.1 Hz to 10 Hz G = 1 101010 10 V p-p G = 100 0.3 0.3 0.3 0.3 V p-p G = 200, 500, 1000 0.2 0.2 0.2 0.2 V p-p Current Noise 0.1 Hz to 10 Hz 60 60 60 60 pA p-p SENSE INPUT 8 10 12 8 10 12 8 10 12 8 10 12 k R IN I 30 30 30 30 A IN Voltage Range 10 10 10 10 V Gain to Output 1 1 1 1 % 2 REV. C