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AD8557 Dataheets PDF



Part Number AD8557
Manufacturers Analog Devices
Logo Analog Devices
Description Digitally Programmable Sensor Signal Amplifier
Datasheet AD8557 DatasheetAD8557 Datasheet (PDF)

Data Sheet FEATURES Very low offset voltage: 12 μV maximum over temperature Very low input offset voltage drift: 65 nV/°C maximum High CMRR: 96 dB minimum Digitally programmable gain and output offset voltage Gain range from 28 to 1300 Qualified for automotive applications Single-wire serial interface Stable with any capacitive load SOIC and LFCSP packages 2.7 V to 5.5 V operation APPLICATIONS Automotive sensors Pressure and position sensors Precision current sensing Thermocouple amplifiers Indu.

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Data Sheet FEATURES Very low offset voltage: 12 μV maximum over temperature Very low input offset voltage drift: 65 nV/°C maximum High CMRR: 96 dB minimum Digitally programmable gain and output offset voltage Gain range from 28 to 1300 Qualified for automotive applications Single-wire serial interface Stable with any capacitive load SOIC and LFCSP packages 2.7 V to 5.5 V operation APPLICATIONS Automotive sensors Pressure and position sensors Precision current sensing Thermocouple amplifiers Industrial weigh scales Strain gages GENERAL DESCRIPTION The AD8557 is a zero drift, sensor signal amplifier with digitally programmable gain and output offset. Designed to easily and accurately convert variable pressure sensor and strain bridge outputs to a well-defined output voltage range, the AD8557 accurately amplifies many other differential or single-ended sensor outputs. The AD8557 uses the Analog Devices, Inc., proprietary low noise auto-zero and DigiTrim® technologies to create an accurate and flexible signal processing solution in a compact footprint. Gain is digitally programmable in a wide range from 28 to 1300 through a serial data interface. Gain adjustment can be fully simulated in circuit and then permanently programmed with reliable polyfuse technology. Output offset voltage is also digitally programmable and is ratiometric to the supply voltage. In addition to extremely low input offset voltage and input offset voltage drift and very high dc and ac CMRR, the AD8557 Digitally Programmable Sensor Signal Amplifier AD8557 FUNCTIONAL BLOCK DIAGRAM VDD VNEG VPOS VDD A1 VSS VDD A2 VSS VCLAMP R4 P3 R6 R1 VDD P1 R3 A3 P2 R2 R5 VSS R7 VDD P4 DIGIN A4 VSS VOUT 06013-001 VSS Figure 1. also includes a pull-up current source at the input pins and a pull-down current source at the VCLAMP pin. Output clamping set via an external reference voltage allows the AD8557 to drive lower voltage analog-to-digital converters (ADCs) safely and accurately. When used in conjunction with an ADC referenced to the same supply, the system accuracy becomes immune to normal supply voltage variations. Output offset voltage can be adjusted with a resolution of better than 0.4% of the difference between VDD and VSS. A lockout trim after gain and offset adjustment further ensures field reliability. The AD8557 is fully specified from −40°C to +125°C. Operating from single-supply voltages of 2.7 V to 5.5 V, the AD8557 is offered in an 8-lead SOIC, and a 4 mm × 4 mm, 16-lead LFCSP. 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 rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2007–2016 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com AD8557 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 Thermal Resistance ...................................................................... 5 ESD Caution.................................................................................. 5 Pin Configurations and Function Descriptions ........................... 6 Typical Performance Characteristics ............................................. 7 REVISION HISTORY 5/16—Rev. C to Rev. D Changed CP-16-10 to CP-16-20 .................................. Throughout Changes to Figure 3 and Table 5..................................................... 6 Updated Outline Dimensions ....................................................... 21 Changes to Ordering Guide .......................................................... 22 6/11—Rev. B to Rev. C Added EPAD Note to Figure 3 and Table 5................................... 6 Changes to Open Wire Fault Detection Section and Table 8 ... 16 7/10—Rev. A to Rev. B Changes to Features Section and Figure 1..................................... 1 Changes to Figure 45...................................................................... 14 Changes t.


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