Low Power, Wide Supply Range, Low Cost Unity-Gain Difference Amplifiers Data Sheet AD8276/AD8277 FEATURES FUNCTIONAL BLOCK DIAGRAMS +VS Wide input range beyond supplies 7 AD8276 Rugged input overvoltage protection 40k 40k 2 IN 5 SENSE Low supply current: 200 A maximum per channel Low power dissipation: 0.54 mW at V = 2.7 V S 6 OUT Bandwidth: 550 kHz CMRR: 86 dB minimum, dc to 10 kHz 40k 40k 3 1 +IN REF System offset voltage: 2 V/C maximum (B Grade) Low gain drift: 1 ppm/C maximum (B Grade) 4 VS Enhanced slew rate: 1.1 V/s Figure 1. AD8276 Wide power supply range +VS Single supply: 2.0 V to 36 V 11 Dual supplies: 2 V to 18 V AD8277 40k 40k 2 INA 12 SENSEA APPLICATIONS Voltage measurement and monitoring 13 OUTA Current measurement and monitoring 40k 40k Differential output instrumentation amplifier 3 14 +INA REFA Portable, battery-powered equipment 40k 40k Test and measurement 6 10 INB SENSEB GENERAL DESCRIPTION 9 OUTB The AD8276/AD8277 are general-purpose, unity-gain difference 40k 40k amplifiers intended for precision signal conditioning in power +INB 5 8 REFB critical applications that require both high performance and low 4 power. They provide exceptional 86 dB common-mode rejection VS ratio (CMRR) and high bandwidth while amplifying signals well Figure 2. AD8277 beyond the supply rails. The on-chip resistors are laser trimmed The AD8276 is available in the space-saving 8-lead mini small for gain drift of 1 ppm/C and high CMRR. The AD8276/AD8277 outline package (MSOP) and the standard small outline (SOIC) also have extremely low gain drift vs. temperature. package, as well as in die form, and the AD8277 is offered in a The common-mode range of the amplifiers extends to almost 14-lead SOIC package. Both are specified for performance over double the supply voltage, making these amplifiers ideal for the industrial temperature range of 40C to +85C and are single-supply applications that require a high common-mode fully RoHS compliant. voltage range. The internal resistors and electrostatic discharge (ESD) circuitry at the inputs also provide overvoltage protection Table 1. Difference Amplifiers by Category to the op amps. Low High 1 The AD8276/AD8277 are unity-gain stable. Although they are Distortion Voltage Current Sensing Low Power AD8270 AD628 AD8202 (U) AD8276 optimized for use as difference amplifiers, they can also be AD8271 AD629 AD8203 (U) AD8277 connected in high precision, single-ended configurations with G = 1, +1, or +2. The AD8276/AD8277 provide an integrated AD8273 AD8205 (B) AD8278 precision solution that has smaller size, lower cost, and improved AD8274 AD8206 (B) performance than a discrete alternative. AMP03 AD8216 (B) The AD8276/AD8277 operate on single supplies (2.0 V to 36 V) 1 U means unidirectional, B means bidirectional. or dual supplies (2 V to 18 V). The maximum quiescent supply current is 200 A per channel, which is ideal for battery- operated and portable systems. Rev. D Document Feedback 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 20092019 Analog Devices, Inc. All rights reserved. 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. Technical Support www.analog.com 07692-001 07692-052AD8276/AD8277 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Driving the AD8276/AD8277 .................................................. 14 Applications ....................................................................................... 1 Input Voltage Range ................................................................... 14 General Description ......................................................................... 1 Power Supplies ............................................................................ 15 Functional Block Diagrams ............................................................. 1 Applications Information .............................................................. 16 Revision History ............................................................................... 2 Configurations ............................................................................ 16 Specifications ..................................................................................... 3 Differential Output .................................................................... 16 Absolute Maximum Ratings ............................................................ 5 Current Source ............................................................................ 17 Thermal Resistance ...................................................................... 5 Voltage and Current Monitoring .............................................. 17 Maximum Power Dissipation ..................................................... 5 Instrumentation Amplifier........................................................ 18 Short-Circuit Current .................................................................. 5 RTD .............................................................................................. 18 ESD Caution .................................................................................. 5 Die Information .............................................................................. 19 Pin Configurations and Function Descriptions ........................... 6 Die Specifications and Assembly Recommendations ........... 19 Typical Performance Characteristics ............................................. 8 Outline Dimensions ....................................................................... 20 Theory of Operation ...................................................................... 14 Ordering Guide .......................................................................... 22 Circuit Information .................................................................... 14 REVISION HISTORY 11/2019Rev. C to Rev. D Changes to Features Section ............................................................ 1 Changes to General Description .................................................... 1 Changes to General Description Section ....................................... 1 Added Figure 2 Renumbered Sequentially ................................... 1 Changes to Thermal Resistance Section ........................................ 5 Added Figure 6 and Table 7 Renumbered Sequentially ............. 6 Changes to Specifications Section ................................................... 3 Changes to Current Source Section and Figure 50 .................... 17 Changes to Figure 3 and Table 5 ...................................................... 5 Added Die Information Section, Die Specifications and Added Figure 5 and Table 7 Renumbered Sequentially .............. 7 Assembly Recommendations Section, Table 10, Changes to Figure 10 ......................................................................... 8 and Table 11 ..................................................................................... 19 Changes to Figure 34 ...................................................................... 12 Updated Outline Dimensions ....................................................... 20 Added Figure 36 ............................................................................. 13 Changes to Ordering Guide .......................................................... 22 Changes to Input Voltage Range Section .................................... 14 Changes to Power Supplies Section and Added Figure 40 ........ 15 11/2011Rev. B to Rev. C Added to Figure 40 ......................................................................... 15 Change to Figure 53 ....................................................................... 18 Changes to Differential Output Section ...................................... 16 Added Figure 47 and Changes to Current Source Section ....... 17 4/2010Rev. A to Rev. B Added Voltage and Current Monitoring Section and Figure 49..... 17 Changes to Figure 53 ...................................................................... 18 Moved Instrumentation Amplifier Section and Added RTD Updated Outline Dimensions ....................................................... 19 Section ........................................................................................................ 18 Changes to Ordering Guide .......................................................... 20 7/2009Rev. 0 to Rev. A Added AD8277 ................................................................... Universal 5/2009Revision 0: Initial Version Rev. D Page 2 of 22