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Ultralow Drift, Dual BiFET Op Amp AD647

FEATURES Low Offset Voltage Drift Matched Offset Voltage Matched Offset Voltage Over Temperature Matched Bias Currents Crosstalk: –124 dB at 1 kHz Low Bias Current: 35 pA max Warmed Up Low Offset Voltage: 250 ␮V max Low Input Voltage Noise: 2 ␮V p High Open Loop Gain: 108 dB Low Quiescent Current: 2.8 mA max Low Total Harmonic Distortion Standard Dual Amplifier Pinout Available in Hermetic Metal Can Package, Hermetic Surface Mount (20-Pin LCC) and Chip Form MIL-STD-883B Processing Also Available Single Version Available: AD547


The AD647 is an ultralow drift, dual JFET amplifier that combines high performance and convenience in a single package. The AD647 uses the most advanced ion-implantation and laser wafer drift trimming technologies to achieve the highest performance currently available in a dual JFET. Ion-implantation permits the fabrication of matched JFETs on a monolithic bipolar chip. Laser wafer drift trimming trims both the initial offset voltage and its drift with temperature to provide offsets as low as 100 µV (250 µV max) and drifts of 2.5 µV/°C max. In addition to outstanding individual amplifier performance, the AD647 offers guaranteed and tested matching performance on critical parameters such as offset voltage, offset voltage drift and bias currents. The high level of performance makes the AD647 especially well suited for high precision instrumentation amplifier applications that previously would have required the costly selection and matching of space wasting single amplifiers. The AD647 is offered in four performance grades, three commercial (the J, K and L) and one extended (the S). All are supplied in hermetically sealed 8-pin TO-99 packages and are available processed to MIL-STD-883B. The LCC version is also available processed to MIL-STD-883B.


1. The AD647 is guaranteed and tested to tight matching specifications to ensure high performance and to eliminate the selection and matching of single devices. 2. Laser wafer drift trimming reduces offset voltage and offset voltage drifts to 250 µV and 2.5 µV/°C max. 3. Voltage noise is guaranteed at 4 µV p max (0.1 Hz to 10 Hz) on K, L and S grades. 4. Bias current (35 pA K, L, S; 75 pA J) is specified after five minutes of operation. 5. Total supply current is a low 2.8 mA max. 6. High open loop gain ensures high linearity in precision instrumentation amplifier applications. 7. The standard dual amplifier pinout permits the direct substitution of the AD647 for lower performance devices. 8. The AD647 is available in chip form.

REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its 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 otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703

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