Picoampere Input Current Quad Bipolar Op Amp AD704 FEATURES CONNECTION DIAGRAMS High dc precision OUTPUT 1 16 OUTPUT 150 V maximum offset voltage IN 2 1 4 15 IN +IN 3 14 +IN 1.5 V/C maximum offset voltage drift OUTPUT 1 14 OUTPUT AD704 IN 2 1 4 13 IN +V 4 13 V S S 270 pA maximum input bias current TOP VIEW +IN 3 12 +IN +IN 5 12 +IN 0.3 pA/C typical I drift B AD704 +V 4 11 V S S IN 6 2 3 11 IN TOP VIEW Low noise: 0.5 V p-p +IN 5 10 +IN OUTPUT 7 10 OUTPUT Typical noise: 0.1 Hz to 10 Hz IN 6 2 3 9 IN 8 NC 9 NC (Not to Scale) Low power: 600 A maximum supply current per amplifier OUTPUT 7 8 OUTPUT (Not to Scale) NC = NO CONNECT Dual version: AD706 Figure 1. 14-Lead Plastic DIP (N) Figure 2. 16-Lead SOIC (R) Package APPLICATIONS Industrial/process controls 3 2 1 20 19 Weigh scales ECG/EKG instrumentation 4 18 +IN4 +IN1 1 4 Low frequency active filters 5 17 NC NC AD704 TOP VIEW +V 6 16 V S S GENERAL DESCRIPTION (Not to Scale) NC 7 15 NC The AD704 is a quad, low power bipolar op amp that has the 2 3 +IN2 8 14 +IN3 low input bias current of a BiFET amplifier and offers a signifi- 9 10 11 12 13 cantly lower IB drift over temperature. It uses superbeta bipolar NC = NO CONNECT input transistors to achieve picoampere input bias current levels (similar to FET input amplifiers at room temperature), while its Figure 3. 20-Terminal LCC I typically increases only by 5 at 125C (unlike a BiFET amp, B (E-20-1) Package for which I doubles every 10C, resulting in a 1000 increase at B 100 125C). In addition, the AD704 achieves 150 V offset voltage and the low noise characteristics of a precision bipolar input op amp. 10 Because it has only 1/20 the input bias current of an OP07, the TYPICAL JFET AMP AD704 does not require the commonly used balancing resistor. Furthermore, the current noise is 1/5 that of the OP07, which 1 makes the AD704 usable with much higher source impedances. At 1/6 the supply current (per amplifier) of the OP07, the AD704 is better suited for todays higher density circuit boards 0.1 and battery-powered applications. AD704 The AD704 is an excellent choice for use in low frequency active 0.01 filters in 12- and 14-bit data acquisition systems, in precision 55 25 125 TEMPERATURE (C) instrumentation, and as a high quality integrator. The AD704 is Figure 4. Input Bias Current Over Temperature internally compensated for unity gain stability. The AD704J is rated over the commercial temperature range of 0C to 70C. Table 1. Low IB 125C The AD704A is rated over the industrial temperature of 40C Model 30V 16V 1.3 to 5V Next Generation to +85C. The AD704S is rated over the military temperature Single N/A AD8663 AD8603 N/A range of 55C to +125C, processed to MIL-STD-883B. Dual AD706 AD8667 AD8607 AD8622 Quad AD704 AD8669 AD8609 AD8624 Rev. E 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 2001-2010 Analog Devices, Inc. All rights reserved. TYPICAL I (nA) B IN2 IN1 OUT2 OUT1 NC NC 00818-001 OUT3 OUT4 IN3 IN4 00818-003 00818-004 00818-002AD704 TABLE OF CONTENTS Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................5 Applications ....................................................................................... 1 ESD Caution...................................................................................5 General Description ......................................................................... 1 Typical Performance Characteristics ..............................................6 Connection Diagrams ...................................................................... 1 Theory of Operation ...................................................................... 11 Revision History ............................................................................... 2 Outline Dimensions ....................................................................... 13 Specifications ..................................................................................... 3 Ordering Guide .......................................................................... 14 REVISION HISTORY 1/10Rev. D to Rev. E Updated Format .................................................................. Universal Changes to Features and General Description Section, Added Table 1, Renumbered Sequentially .................................... 1 Changes to Table 2 ............................................................................ 3 Changes to Table 3 ............................................................................ 5 Updated Outline Dimensions ....................................................... 13 Changes to Ordering Guide .......................................................... 14 12/09Rev. C to Rev. D Updated Outline Dimensions ....................................................... 10 Changes to Ordering Guide .......................................................... 10 11/01Rev. B to Rev. C Edits to Features ................................................................................ 1 Edits to Product Description .......................................................... 1 Edits to Absolute Maximum Ratings ............................................. 3 Deleted Metalization Photograph .................................................. 3 Edits to Ordering Guide .................................................................. 4 Rev. E Page 2 of 16