16 V Auto-Zero, Rail-to-Rail Output Operational Amplifiers AD8638/AD8639 FEATURES PIN CONFIGURATIONS Low offset voltage: 9 V maximum OUT 1 5 V+ Offset drift: 0.04 V/C maximum AD8638 TOP VIEW V 2 Rail-to-rail output swing (Not to Scale) 5 V to 16 V single-supply or 2.5 V to 8 V dual-supply +IN 3 4 IN operation Figure 1. 5-Lead SOT-23 (RJ-5) High gain: 136 dB typical High CMRR: 133 dB typical NC 1 8 NC High PSRR: 143 dB typical AD8638 IN 2 7 V+ Very low input bias current: 40 pA maximum +IN 3 6 OUT TOP VIEW Low supply current: 1.3 mA maximum (Not to Scale) V 4 5 NC AD8639: qualified for automotive applications NC = NO CONNECT APPLICATIONS Figure 2. 8-Lead SOIC N (R-8) Pressure and position sensors OUT A 1 8 V+ Strain gage amplifiers AD8639 IN A 2 7 OUT B TOP VIEW Medical instrumentation +IN A 3 6 IN B (Not to Scale) Thermocouple amplifiers V 4 5 +IN B Automotive sensors Figure 3. 8-Lead MSOP (RM-8) Precision references 8-Lead SOIC N (R-8) Precision current sensing PIN 1 OUT A 1 8V+ INDICATOR GENERAL DESCRIPTION IN A 2 7OUT B AD8639 +IN A 3 6 IN B TOP VIEW The AD8638/AD8639 are single and dual wide bandwidth, v 4 (Not to Scale) 5 +IN B auto-zero amplifiers featuring rail-to-rail output swing and low noise. These amplifiers have very low offset, drift, and bias NOTES current. Operation is fully specified from 5 V to 16 V single 1. PIN 4 AND THE EXPOSED PAD MUST BE CONNECTED TO V. supply (2.5 V to 8 V dual supply). Figure 4. 8-Lead LFCSP WD (CP-8-5) The AD8638/AD8639 provide benefits previously found only in expensive zero-drift or chopper-stabilized amplifiers. Using the Analog Devices, Inc., topology, these auto-zero amplifiers The AD8638/AD8639 are specified for the extended industrial combine low cost with high accuracy and low noise. No exter- temperature range (40C to +125C). The single AD8638 is nal capacitors are required. In addition, the AD8638/AD8639 available in tiny 5-lead SOT-23 and 8-lead SOIC packages. greatly reduce the digital switching noise found in most chopper- The dual AD8639 is available in 8-lead MSOP, 8-lead SOIC, and stabilized amplifiers. 8-lead LFCSP packages. See the Ordering Guide for automotive With a typical offset voltage of only 3 V, drift of 0.01 V/C, grades. and noise of 1.2 V p-p (0.1 Hz to 10 Hz), the AD8638/AD8639 The AD8638/AD8639 are members of a growing series of auto- are suited for applications in which error sources cannot be zero op amps offered by Analog Devices (see Table 1). tolerated. Position and pressure sensors, medical equipment, Table 1. Auto-Zero Op Amps and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature ranges. Many systems can take Supply 2.7 V to 5 V 2.7 V to 5 V Low Power 5 V to 16 V advantage of the rail-to-rail output swing provided by the Single AD8628 AD8538 AD8638 AD8638/AD8639 to maximize signal-to-noise ratio (SNR). Dual AD8629 AD8539 AD8639 Quad AD8630 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 20072010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 06895-002 06895-001 06895-203 06895-204AD8638/AD8639 TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 14 Applications ....................................................................................... 1 1/f Noise ....................................................................................... 14 General Description ......................................................................... 1 Input Voltage Range ................................................................... 14 Pin Configurations ........................................................................... 1 Output Phase Reversal ............................................................... 14 Revision History ............................................................................... 2 Overload Recovery Time .......................................................... 14 Specif icat ions ..................................................................................... 3 Infrared Sensors .......................................................................... 15 Electrical Characteristics5 V Operation................................ 3 Precision Current Shunt Sensor ............................................... 15 Electrical Characteristics16 V Operation ............................. 4 Output Amplifier for High Precision DACs ........................... 15 Absolute Maximum Ratings ............................................................ 5 Outline Dimensions ....................................................................... 16 Thermal Resistance ...................................................................... 5 Ordering Guide .......................................................................... 18 ESD Caution .................................................................................. 5 Automotive Products ................................................................. 18 Typical Performance Characteristics ............................................. 6 REVISION HISTORY 6/10Rev. E to Rev. F 4/08Rev. A to Rev. B Added AD8639 ................................................................... Universal Changes to Features Section and General Description Section . 1 Added 8-lead MSOP Package ........................................... Universal Updated Outline Dimensions ....................................................... 16 Changes to Features .......................................................................... 1 Changes to Ordering Guide .......................................................... 18 Changes to General Description ..................................................... 1 Added Automotive Products Section .......................................... 18 Changes Table 2 ................................................................................. 3 6/09Rev. D to Rev. E Changes to Table 3 ............................................................................. 4 Changes to Figure 4 .......................................................................... 1 Changes to Table 4, Added Endnote 1 and Endnote 2 ................. 5 Changes to Endnote 1 and Endnote 2, Table 4 ............................. 5 Changes to Figure 4 through Figure 9 ............................................ 6 Changes to Input Voltage Range Section .................................... 14 Changes to Figure 11, Figure 12, Figure 14, and Figure 15.......... 7 Updated Outline Dimensions ....................................................... 16 Changes to Figure 16 through Figure 27 ........................................ 8 Changes to Ordering Guide .......................................................... 18 Changes to Figure 28 through Figure 33 ..................................... 10 Changes to Figure 34 through Figure 39 ..................................... 11 12/08Rev. C to Rev. D Changes to Figure 41 and Figure 44............................................. 12 Changes to Endnote 1, Table 4 ........................................................ 5 Inserted Figure 46, Figure 47, Figure 49, and Figure 50 Changes to Ordering Guide .......................................................... 28 Renumbered Sequentially ............................................................. 13 5/08Rev. B to Rev. C Changes to Figure 51, Figure 52, and Figure 53 ......................... 15 Updated Outline Dimensions ....................................................... 16 Added LFCSP WD Package ............................................. Universal Changes to Ordering Guide .......................................................... 17 Inserted Figure 4 Renumbered Sequentially ................................ 1 Changes to Layout ............................................................................ 1 11/07Rev. 0 to Rev. A Changes to General Description .................................................... 1 Change to Large Signal Voltage Gain Specification ...................... 4 Changes to Offset Voltage Drift for All Packages Except SOT-23 11/07Revision 0: Initial Version Parameter in Table 2 ......................................................................... 3 Changes to Table 5 ............................................................................ 5 Updated Outline Dimensions ....................................................... 16 Changes to Ordering Guide .......................................................... 17 Rev. F Page 2 of 20