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AD7191 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7191 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 20 page Pin-Programmable, Ultralow Noise, 24-Bit, Sigma-Delta ADC for Bridge Sensors AD7191 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesfor itsuse,norfor anyinfringements ofpatents orother 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 ©2009 Analog Devices, Inc. All rights reserved. FEATURES Pin-programmable output rate Output data rate: 10 Hz, 50 Hz, 60 Hz, 120 Hz Pin-programmable PGA Gain: 1, 8, 64, 128 Pin-programmable power-down and reset RMS noise: 15 nV @ 10 Hz (gain = 128) Up to 21.5 noise free bits (gain = 1) Internal or external clock Bridge power-down switch Offset drift: 5 nV/°C Gain drift: 1 ppm/°C Specified drift over time Simultaneous 50 Hz/60 Hz rejection Internal temperature sensor Power supply: 3 V to 5.25 V Current: 4.35 mA Temperature range: –40°C to +105°C Package: 24-lead TSSOP INTERFACE 2-wire serial SPI, QSPI™, and MICROWIRE™ compatible Schmitt trigger on SCLK APPLICATIONS Weigh scales Strain gauge transducers Pressure measurement Medical and scientific instrumentation GENERAL DESCRIPTION The AD7191 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) ADC. The on-chip low noise gain stage means that signals of small amplitude can be interfaced directly to the ADC. It contains two differential analog inputs. The part also includes a temperature sensor that can be used for temperature compensation. For ease-of-use, all the features of the AD7191 are controlled by dedicated pins. The on-chip PGA has a gain of 1, 8, 64, or 128, supporting a full-scale differential input of ±5 V, ±625 mV, ±78 mV, or ±39 mV. The output data rate can be programmed to 10 Hz, 50 Hz, 60 Hz, or 120 Hz. Simultaneous 50 Hz and 60 Hz rejection is obtained when the output data rate is set to 10 Hz or 50 Hz; 60 Hz only rejection is obtained when the output data rate is set to 60 Hz. The AD7191 can be operated with the internal clock, or an external clock can be used. The part operates with a power supply of 3 V to 5.25 V. It consumes a current of 4.35 mA. It is available in a 24-lead TSSOP package. FUNCTIONAL BLOCK DIAGRAM MUX AD7191 AIN1 DOUT/RDY SCLK PDOWN CHAN CLKSEL PGA2 PGA1 AGND DGND REFIN(+) REFIN(–) AVDD DVDD AIN2 AIN3 AIN4 BPDSW MCLK1 MCLK2 ODR2 ODR1 TEMP TEMPERATURE SENSOR CLOCK CIRCUITRY PGA SERIAL INTERFACE AND CONTROL LOGIC Σ-Δ ADC Figure 1. |
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