Precision, Very Low Noise, Low Input Bias Current, Wide Bandwidth JFET Operational Amplifiers AD8610/AD8620 FEATURES PIN CONFIGURATIONS Low noise: 6 nV/Hz NULL 1 8 NC Low offset voltage: 100 V maximum IN 2 7 V+ AD8610 +IN 3 6 OUT Low input bias current: 10 pA maximum TOP VIEW (Not to Scale) V 4 5 NULL Fast settling: 600 ns to 0.01% Low distortion NC = NO CONNECT Unity gain stable Figure 1. 8-Lead MSOP and 8-Lead SOIC N No phase reversal Dual-supply operation: 5 V to 13 V OUTA 1 8 V+ INA 2 7 OUTB AD8620 APPLICATIONS +INA 3 6 INB TOP VIEW (Not to Scale) Photodiode amplifiers V 4 5 +INB ATE Instrumentation Figure 2. 8-Lead SOIC N Sensors and controls High performance filters Fast precision integrators High performance audio GENERAL DESCRIPTION The AD8610/AD8620 are very high precision JFET input ampli- Applications for the AD8610/AD8620 include electronic instru- fiers featuring ultralow offset voltage and drift, very low input ments ATE amplification, buffering, and integrator circuits voltage and current noise, very low input bias current, and wide CAT/MRI/ultrasound medical instrumentation instrumentation bandwidth. Unlike many JFET amplifiers, the AD8610/AD8620 quality photodiode amplification fast precision filters (including input bias current is low over the entire operating temperature PLL filters) and high quality audio. range. The AD8610/AD8620 are stable with capacitive loads of The AD8610/AD8620 are fully specified over the extended over 1000 pF in noninverting unity gain much larger capacitive industrial temperature range (40C to +125C). The AD8610 loads can be driven easily at higher noise gains. The AD8610/ is available in the narrow 8-lead SOIC and the tiny 8-lead MSOP AD8620 swing to within 1.2 V of the supplies even with a 1 k surface-mount packages. The AD8620 is available in the narrow load, maximizing dynamic range even with limited supply volt- 8-lead SOIC package. The 8-lead MSOP packaged devices are ages. Outputs slew at 50 V/s in either inverting or noninverting avail-able only in tape and reel. gain configurations, and settle to 0.01% accuracy in less than 600 ns. Combined with high input impedance, great precision, and very high output drive, the AD8610/AD8620 are ideal amplifiers for driving high performance ADC inputs and buffering DAC converter outputs. Rev. F 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. Fax: 781.461.3113 20012008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 02730-001 02730-002AD8610/AD8620 TABLE OF CONTENTS Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................5 Applications ....................................................................................... 1 ESD Caution...................................................................................5 Pin Configurations ........................................................................... 1 Typical Performance Characteristics ..............................................6 General Description ......................................................................... 1 Theory of Operation ...................................................................... 13 Revision History ............................................................................... 2 Functional Description .............................................................. 13 Specif icat ions ..................................................................................... 3 Outline Dimensions ....................................................................... 22 Electrical Specifications ............................................................... 4 Ordering Guide .......................................................................... 22 Changes to Specifications ................................................................. 2 REVISION HISTORY Changes to Ordering Guide ............................................................. 4 5/08Rev. E to Rev. F Updated Outline Dimensions ....................................................... 17 Changes to Figure 17 ........................................................................ 8 10/02Rev. B to Rev. C. Changes to Functional Description Section ............................... 13 Updated Ordering Guide ................................................................. 4 Changes to THD Readings vs. Common-Mode Voltage Edits to Figure 15 ............................................................................ 12 Section .............................................................................................. 17 Updated Outline Dimensions ....................................................... 16 Changes to Output Current Capability Section ......................... 18 Changes to Figure 66 and Figure 67 ............................................. 19 5/02Rev. A to Rev. B Changes to Figure 68 ...................................................................... 20 Addition of Part Number AD8620 ................................... Universal Replaced Second-Order Low-Pass Filter Section ....................... 20 Addition of 8-Lead SOIC (R-8 Suffix) Drawing ............................ 1 11/06Rev. D to Rev. E Changes to General Description ..................................................... 1 Additions to Specifications .............................................................. 2 Updated Format .................................................................. Universal Change to Electrical Specifications ................................................. 3 Changes to Table 1 ............................................................................ 3 Additions to Ordering Guide ........................................................... 4 Changes to Table 2 ............................................................................ 4 Replace TPC 29 .................................................................................. 8 Changes to Outline Dimensions ................................................... 21 Changes to Ordering Guide .......................................................... 21 Add Channel Separation Test Circuit Figure ................................. 9 Add Channel Separation Graph ...................................................... 9 Changes to Figure 26 ...................................................................... 15 2/04Rev. C to Rev. D. Addition of High-Speed, Low Noise Differential Driver section .............................................................................................. 16 Addition of Figure 30 ..................................................................... 16 Rev. F Page 2 of 24