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AD8555ACPZ-R21 数据表(PDF) 1 Page - Analog Devices |
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AD8555ACPZ-R21 数据表(HTML) 1 Page - Analog Devices |
1 / 28 page Zero-Drift, Digitally Programmable Sensor Signal Amplifier AD8555 Rev. A 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. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703©2004–2009 Analog Devices, Inc. All rights reserved. FEATURES Very low offset voltage: 10 μV maximum over temperature Very low input offset voltage drift: 60 nV/°C maximum High CMRR: 96 dB minimum Digitally programmable gain and output offset voltage Single-wire serial interface Open and short wire fault detection Low-pass filtering Stable with any capacitive load Externally programmable output clamp voltage for driving low voltage ADCs LFCSP-16 and SOIC-8 packages 2.7 V to 5.5 V operation −40°C to +125°C operation APPLICATIONS Automotive sensors Pressure and position sensors Thermocouple amplifiers Industrial weigh scales Precision current sensing Strain gages FUNCTIONAL BLOCK DIAGRAM A3 A2 A4 A5 VDD VDD DAC VSS VSS VDD VSS VDD VDD VSS VCLAMP VPOS VSS FILT/ DIGOUT VOUT A1 VDD VSS VNEG R1 R3 R2 R5 R7 P4 R4 R6 RF P3 P2 P1 Figure 1. GENERAL DESCRIPTION The AD8555 is a zero-drift, sensor signal amplifier with digital- ly 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 AD8555 also accurately amplifies many other differential or single-ended sensor outputs. The AD8555 uses the ADI patented low noise auto-zero and DigiTrim® technologies to create an incredibly accurate and flexible signal processing solution in a very com- pact footprint. Gain is digitally programmable in a wide range from 70 to 1,280 through a serial data interface. Gain adjustment can be fully simulated in-circuit and then permanently programmed with proven and reliable poly-fuse 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 off- set voltage drift and very high dc and ac CMRR, the AD8555 also includes a pull-up current source at the input pins and a pull-down current source at the VCLAMP pin. This allows open wire and shorted wire fault detection. A low-pass filter function is implemented via a single low cost external capacitor. Output clamping set via an external reference voltage allows the AD8555 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 fur- ther ensures field reliability. The AD8555 is fully specified over the extended industrial tem- perature range of −40°C to +125°C. Operating from single-supply voltages of 2.7 V to 5.5 V, the AD8555 is offered in the narrow 8-lead SOIC package and the 4 mm × 4 mm 16-lead LFCSP. |
类似零件编号 - AD8555ACPZ-R21 |
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类似说明 - AD8555ACPZ-R21 |
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