Zero Drift, Digitally Programmable Instrumentation Amplifier Data Sheet AD8231-EP FEATURES FUNCTIONAL BLOCK DIAGRAM Digitally/pin-programmable gain G = 1, 2, 4, 8, 16, 32, 64, or 128 Specified from 55C to +125C 1 12 50 nV/C maximum input offset drift NC +V S 10 ppm/C maximum gain drift LOGIC 2 11 INA V S Excellent dc performance IN-AMP 80 dB minimum CMR, G = 1 3 10 +INA OUTA 15 V maximum input offset voltage 4 9 500 pA maximum bias current NC REF 0.7 V p-p noise (0.1 Hz to 10 Hz) OP AD8231-EP AMP Good ac performance 2.7 MHz bandwidth, G = 1 1.1 V/s slew rate Rail-to-rail output Figure 1. Shutdown/multiplex Extra op amp Table 1. Instrumentation and Difference Amplifiers by Single-supply range: 3 V to 6 V Category Dual-supply range: 1.5 V to 3 V High Low High Mil Low Digital Performance Cost Voltage Grade Power Gain ENHANCED PRODUCT FEATURES 1 1 1 AD8221 AD623 AD628 AD620 AD627 AD8231 Supports defense and aerospace applications (AQEC 1 1 AD8220 AD8553 AD629 AD621 AD8250 standard) AD8222 AD524 AD8251 1 1 Military temperature range (55C to +125C) AD8224 AD526 AD8555 1 Controlled manufacturing baseline AD624 AD8556 1 One assembly/test site AD8557 One fabrication site 1 Rail-to-rail output. Enhanced product change notification Qualification data available on request GENERAL DESCRIPTION The AD8231-EP also includes an uncommitted op amp that can The AD8231-EP is a low drift, rail-to-rail, instrumentation be used for additional gain, differential signal driving, or filtering. amplifier with software-programmable gains of 1, 2, 4, 8, 16, 32, 64, Like the in-amp, the op amp has an auto-zero architecture, rail- or 128. The gains are programmed via digital logic or pin to-rail input, and rail-to-rail output. strapping. The AD8231-EP includes a shutdown feature that reduces current The AD8231-EP is ideal for applications that require precision to a maximum of 1 A. In shutdown, both amplifiers also have performance over a wide temperature range, such as industrial a high output impedance, which allows easy multiplexing of temperature sensing and data logging. Because the gain setting multiple amplifiers without additional switches. resistors are internal, maximum gain drift is only 10 ppm/C for gains of 1 to 32. Because of the auto-zero input stage, maximum The AD8231-EP is specified over the military temperature input offset is 15 V and maximum input offset drift is just range of 55C to +125C. It is available in a 4 mm 4 mm 16- 50 nV/C. CMRR is 80 dB for G = 1, increasing to 110 dB at lead LFCSP. higher gains. Additional application and technical information can be found in the AD8231 data sheet. Rev. 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Technical Support www.analog.com 5 16 SDN A2 6 15 +INB A1 7 14 INB A0 8 13 OUTB CS 09707-001AD8231-EP Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 ESD Caution...................................................................................7 Enhanced Product Features ............................................................ 1 Pin Configuration and Function Descriptions ..............................8 Functional Block Diagram .............................................................. 1 Typical Performance Characteristics ..............................................8 General Description ......................................................................... 1 Instrumentation Amplifier Performance Curves......................9 Revision History ............................................................................... 2 Operational Amplifier Performance Curves .......................... 15 Specifications ..................................................................................... 3 Performance Curves Valid for Both Amplifiers ..................... 17 Absolute Maximum Ratings ............................................................ 7 Outline Dimensions ....................................................................... 18 Thermal Resistance ...................................................................... 7 Ordering Guide .......................................................................... 18 Maximum Power Dissipation ..................................................... 7 REVISION HISTORY 11/2017Rev. 0 to Rev. A Changed CP-16-4 to CP-16-17 .................................... Throughout Updated Outline Dimensions ....................................................... 18 Changes to Ordering Guide .......................................................... 18 5/2011Revision 0: Initial Version Rev. A Page 2 of 20