Digitally Programmable Sensor Signal Amplifier with EMI Filters Data Sheet AD8556 FEATURES APPLICATIONS EMI filters at input pins Pressure and position sensors Specified from 40C to +140C Precision current sensing Low offset voltage: 10 V maximum Strain gages Low input offset voltage drift: 65 nV/C maximum High CMRR: 94 dB minimum Digitally programmable gain and output offset voltage Programmable output clamp voltage Open and short wire fault detection Low-pass filtering Single-wire serial interface Stable with any capacitive load SOIC N and LFCSP WQ packages 4.5 V to 5.5 V operation FUNCTIONAL BLOCK DIAGRAM DIGIN VCLAMP VDD 1 EMI +IN 3 FILTER A5 OUT 2 DAC LOGIC IN VSS VDD EMI 1 +IN R5 P4 R7 VPOS 3 FILTER A1 OUT 2 IN R2 VSS P2 VDD VDD EMI FILTER R3 1 RF +IN 3 EMI 1 A3 +IN OUT 2 3 FILTER A4 V P1 OUT IN OUT 2 VDD IN VSS R1 1 +IN VSS R4 R5 3 A2 OUT EMI 2 VNEG IN P3 FILTER VSS AD8556 VSS FILT/DIGOUT Figure 1. Rev. B 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 20052015 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 05448-053AD8556 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................9 Applications ....................................................................................... 1 Theory of Operation ...................................................................... 17 Functional Block Diagram .............................................................. 1 Gain Values ................................................................................. 18 Revision History ............................................................................... 2 Open Wire Fault Detection ....................................................... 19 General Description ......................................................................... 3 Shorted Wire Fault Detection ................................................... 19 Specifications ..................................................................................... 4 Floating VPOS, VNEG, or VCLAMP Fault Detection ......... 19 Electrical Specifications ............................................................... 4 Device Programming ................................................................. 19 Absolute Maximum Ratings ............................................................ 6 EMI/RFI Performance ................................................................... 25 Thermal Resistance ...................................................................... 6 Outline Dimensions ....................................................................... 27 ESD Caution .................................................................................. 6 Ordering Guide .......................................................................... 27 Pin Configurations and Function Descriptions ........................... 7 REVISION HISTORY 2/15Rev. A to Rev. B Changed LFCSP VQ Package to LFCSP WQ Package ..................................................... Throughout Changes to Applications Section .................................................... 1 Changes to Table 4 ............................................................................ 7 Changes to Figure 3 .......................................................................... 8 Added Table 5 Renumbered Sequentially .................................... 8 Changes to Figure 57 ...................................................................... 27 Updated Outline Dimensions ....................................................... 27 Changes to Ordering Guide .......................................................... 27 12/07Rev. 0 to Rev. A Changes to Features .......................................................................... 1 Changes to General Description .................................................... 3 Updated Outline Dimensions ....................................................... 26 Changes to Ordering Guide .......................................................... 26 5/05Revision 0: Initial Version Rev. B Page 2 of 27