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AD8557ARZ-REEL датащи(PDF) 1 Page - Analog Devices |
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AD8557ARZ-REEL датащи(HTML) 1 Page - Analog Devices |
1 / 24 page Digitally Programmable Sensor Signal Amplifier AD8557 Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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 www.analog.com Fax: 781.461.3113 ©2007–2011 Analog Devices, Inc. All rights reserved. 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_N and LFCSP_VQ 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 FUNCTIONAL BLOCK DIAGRAM A3 A2 A4 VDD VDD DIGIN VSS VSS VDD VSS VDD VCLAMP VPOS VSS VOUT A1 VDD VSS VNEG R1 R3 R2 R5 R7 P4 R4 R6 P3 P2 P1 Figure 1. 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. patented 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 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 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_N, and a 4 mm × 4 mm, 16-lead LFCSP_VQ. |
Аналогичный номер детали - AD8557ARZ-REEL |
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Аналогичное описание - AD8557ARZ-REEL |
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