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AD704AR bảng dữ liệu(PDF) 1 Page - Analog Devices |
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1 / 12 page REV. C 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD704 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002 Quad Picoampere Input Current Bipolar Op Amp FEATURES High DC Precision 75 V Max Offset Voltage 1 V/ C Max Offset Voltage Drift 150 pA Max Input Bias Current 0.2 pA/ C Typical IB Drift Low Noise 0.5 V p-p Typical Noise, 0.1 Hz to 10 Hz Low Power 600 A Max Supply Current per Amplifier MIL-STD-883B Processing Available Available in Tape and Reel in Accordance with EIA-481A Standard Dual Version: AD706 APPLICATIONS Industrial/Process Controls Weigh Scales ECG/EKG Instrumentation Low Frequency Active Filters PRODUCT DESCRIPTION The AD704 is a quad, low power bipolar op amp that has the low input bias current of a BiFET amplifier but which offers a significantly lower IB drift over temperature. It utilizes super-beta bipolar input transistors to achieve picoampere input bias current levels (similar to FET input amplifiers at room temperature), while its IB typically only increases by 5 × at 125°C (unlike a BiFET amp, for which IB doubles every 10 °C resulting in a 1000 × increase at 125°C). Furthermore, the AD704 achieves 75 µV offset voltage and low noise characteristics of a precision bipolar input op amp. Since it has only 1/20 the input bias current of an AD OP07, the AD704 does not require the commonly used “balancing” resistor. Furthermore, the current noise is 1/5 that of the AD OP07 which makes the AD704 usable with much higher source impedances. At 1/6 the supply current (per amplifier) of the AD OP07, the AD704 is better suited for today’s higher density circuit boards and battery-powered applications. The AD704 is an excellent choice for use in low frequency active filters in 12- and 14-bit data acquisition systems, in precision instrumentation, and as a high quality integrator. The AD704 is internally compensated for unity gain and is available in five performance grades. The AD704J and AD704K are rated over the commercial temperature range of 0 °C to 70°C. The AD704A is rated over the industrial temperature of –40 °C to +85°C. The AD704T is rated over the military temperature range of –55 °C to +125 °C and is available processed to MIL-STD-883B, Rev. C. CONNECTION DIAGRAMS 14-Lead Plastic DIP (N) 14-Lead CerDIP (Q) Packages 1 4 1 2 3 4 5 6 7 OUTPUT –IN –IN OUTPUT OUTPUT –IN –IN OUTPUT AD704 (TOP VIEW) +IN +IN +IN +VS –VS +IN 2 3 8 9 10 11 12 13 14 16-Lead SOIC (R) Package 2 3 11 10 12 13 14 15 16 9 1 2 3 4 5 6 7 8 NC = NO CONNECT NC 1 4 OUTPUT –IN –IN OUTPUT OUTPUT –IN –IN OUTPUT AD704 (TOP VIEW) +IN +IN +IN +VS –VS +IN NC 20-Terminal LCC (E) Package AMP 1 AMP 2 AMP 4 AMP 3 32 1 20 19 18 17 16 15 14 910 11 12 13 4 5 6 7 8 +IN4 NC –VS NC +IN3 +IN1 NC +VS NC +IN2 NC = NO CONNECT AD704 100 10 1 0.1 0.01 –55 +25 +125 TEMPERATURE – C TYPICAL JFET AMP AD704T Figure 1. Input Bias Current Over Temperature |
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