Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier AD8628/AD8629/AD8630 FEATURES PIN CONFIGURATIONS Lowest auto-zero amplifier noise OUT 1 5 V+ AD8628 Low offset voltage: 1 V TOP VIEW V 2 Input offset drift: 0.002 V/C (Not to Scale) Rail-to-rail input and output swing +IN 3 4 IN 5 V single-supply operation Figure 1. 5-Lead TSOT (UJ-5) and 5-Lead SOT-23 (RJ-5) High gain, CMRR, and PSRR: 130 dB Very low input bias current: 100 pA maximum Low supply current: 1.0 mA NC 1 8 NC Overload recovery time: 50 s AD8628 IN 2 7 V+ No external components required +IN 3 6 OUT TOP VIEW (Not to Scale) Qualified for automotive applications V 4 5 NC NC = NO CONNECT Figure 2. 8-Lead SOIC N (R-8) APPLICATIONS Automotive sensors Pressure and position sensors OUT A 1 8 V+ Strain gage amplifiers AD8629 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 Precision current sensing Figure 3. 8-Lead SOIC N (R-8) and 8-Lead MSOP (RM-8) Photodiode amplifiers 1 14 OUT D GENERAL DESCRIPTION OUT A IN A 2 13 IN D This amplifier has ultralow offset, drift, and bias current. +IN A 3 12 +IN D AD8630 The AD8628/AD8629/AD8630 are wide bandwidth auto-zero V+ 4 TOP VIEW 11 V (Not to Scale) amplifiers featuring rail-to-rail input and output swing and low +IN B 5 10 +IN C IN B 6 9 IN C noise. Operation is fully specified from 2.7 V to 5 V single supply OUT B 7 8 OUT C (1.35 V to 2.5 V dual supply). Figure 4. 14-Lead SOIC N (R-14) and 14-Lead TSSOP (RU-14) The AD8628/AD8629/AD8630 provide benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using Analog Devices, Inc., topology, these zero- The AD8628/AD8629/AD8630 are specified for the extended drift amplifiers combine low cost with high accuracy and low industrial temperature range (40C to +125C). The AD8628 noise. No external capacitor is required. In addition, the AD8628/ is available in tiny 5-lead TSOT, 5-lead SOT-23, and 8-lead AD8629/AD8630 greatly reduce the digital switching noise narrow SOIC plastic packages. The AD8629 is available in the found in most chopper-stabilized amplifiers. standard 8-lead narrow SOIC and MSOP plastic packages. The With an offset voltage of only 1 V, drift of less than 0.005 V/C, AD8630 quad amplifier is available in 14-lead narrow SOIC and and noise of only 0.5 V p-p (0 Hz to 10 Hz), the AD8628/ 14-lead TSSOP plastic packages. See the Ordering Guide for AD8629/AD8630 are suited for applications where error automotive grades. sources cannot be tolerated. Position and pressure sensors, medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature range. Many systems can take advantage of the rail-to-rail input and output swings provided by the AD8628/AD8629/AD8630 to reduce input biasing complexity and maximize SNR. Rev. I 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 20022011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 02735-002 02735-001 02735-066 02735-063AD8628/AD8629/AD8630 TABLE OF CONTENTS Features .............................................................................................. 1 1/f Noise....................................................................................... 14 Applications....................................................................................... 1 Peak-to-Peak Noise .................................................................... 15 General Description ......................................................................... 1 Noise Behavior with First-Order, Low-Pass Filter................. 15 Pin Configurations ........................................................................... 1 Total Integrated Input-Referred Noise for First-Order Filter15 Revision History ............................................................................... 2 Input Overvoltage Protection ................................................... 16 Specifications..................................................................................... 3 Output Phase Reversal............................................................... 16 Electrical CharacteristicsV = 5.0 V....................................... 3 Overload Recovery Time .......................................................... 16 S Electrical CharacteristicsV = 2.7 V....................................... 4 Infrared Sensors.......................................................................... 17 S Absolute Maximum Ratings............................................................ 5 Precision Current Shunt Sensor ............................................... 18 Thermal Characteristics .............................................................. 5 Output Amplifier for High Precision DACs........................... 18 ESD Caution.................................................................................. 5 Outline Dimensions....................................................................... 19 Typical Performance Characteristics ............................................. 6 Ordering Guide .......................................................................... 21 Functional Description .................................................................. 14 REVISION HISTORY 4/11Rev. H to Rev. I Added Figure 5 and Figure 6............................................................1 Updated Outline Dimensions ....................................................... 19 Changes to Caption in Figure 8 and Figure 9................................7 Changes to Ordering Guide .......................................................... 21 Changes to Caption in Figure 14.....................................................8 Changes to Figure 17.........................................................................8 4/10Rev. G to Rev. H Changes to Figure 23 and Figure 24................................................9 Change to Features List.................................................................... 1 Changes to Figure 25 and Figure 26............................................. 10 Change to General Description Section ........................................ 1 Changes to Figure 31...................................................................... 11 Changes to Table 3............................................................................ 5 Changes to Figure 40, Figure 41, Figure 42................................. 12 Updated Outline Dimensions Section......................................... 19 Changes to Figure 43 and Figure 44............................................. 13 Changes to Ordering Guide .......................................................... 21 Changes to Figure 51...................................................................... 15 Updated Outline Dimensions....................................................... 20 6/08Rev. F to Rev. G Changes to Ordering Guide .......................................................... 20 Changes to Features Section............................................................ 1 Changes to Table 5 and Figure 42 Caption ................................. 12 10/04Rev. B to Rev. C Changes to 1/f Noise Section and Figure 49 ............................... 14 Updated Formatting...........................................................Universal Changes to Figure 51 Caption and Figure 55 ............................. 15 Added AD8629 ...................................................................Universal Changes to Figure 57 Caption and Figure 58 Caption .............. 16 Added SOIC and MSOP Pin Configurations ................................1 Changes to Figure 60 Caption and Figure 61 Caption .............. 17 Added Figure 48 ............................................................................. 13 Changes to Figure 64...................................................................... 18 Changes to Figure 62...................................................................... 17 Added MSOP Package ................................................................... 19 2/08Rev. E to Rev. F Changes to Ordering Guide .......................................................... 22 Renamed TSOT-23 to TSOT ............................................Universal Deleted Figure 4 and Figure 6......................................................... 1 10/03Rev. A to Rev. B Changes to Figure 3 and Figure 4 Captions .................................. 1 Changes to General Description .....................................................1 Changes to Table 1............................................................................ 3 Changes to Absolute Maximum Ratings........................................4 Changes to Table 2............................................................................ 4 Changes to Ordering Guide .............................................................4 Changes to Table 4............................................................................ 5 Added TSOT-23 Package .............................................................. 15 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 20 6/03Rev. 0 to Rev. A Changes to Specifications.................................................................3 5/05Rev. D to Rev. E Changes to Ordering Guide .............................................................4 Changes to Ordering Guide .......................................................... 22 Change to Functional Description............................................... 10 Updated Outline Dimensions....................................................... 15 1/05Rev. C to Rev. D Added AD8630 ...................................................................Universal 10/02Revision 0: Initial Version Rev. I Page 2 of 24