Datasheet AD8556 (Analog Devices)

Digital y Programmable Sensor Signal Amplifier with EMI Filters Data Sheet AD8556 FEATURES APPLICATIONS EMI filters at input pins Pressure and position sensors Specified from −40°C to +140°C Precision current sensing Low offset voltage: 10 µV 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 EMI 1 +IN FILTER 3 A5 2 OUT LOGIC DAC –IN VSS VDD EMI 1 +IN R5 P4 R7 VPOS 3 FILTER A1 2 OUT –IN R2 VSS P2 VDD VDD EMI FILTER R3 1 +IN RF 3 EMI A3 1 +IN 2 OUT FILTER 3 P1 –IN A4 2 OUT VOUT VDD –IN VSS 1 R1 +IN R4 R5 VSS 3 A2 EMI 2 OUT VNEG –IN P3 FILTER VSS AD8556
05448-053
VSS FILT/DIGOUT
Figure 1.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY GENERAL DESCRIPTION SPECIFICATIONS ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION GAIN VALUES OPEN WIRE FAULT DETECTION SHORTED WIRE FAULT DETECTION FLOATING VPOS, VNEG, OR VCLAMP FAULT DETECTION DEVICE PROGRAMMING Digital Interface Initial State Simulation Mode Programming Mode Parity Error Detection Read Mode Sense Current Programming Procedure Determining Optimal Gain and Offset Codes EMI/RFI PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE