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AD7796BRUZ データシート(PDF) 1 Page - Analog Devices |
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AD7796BRUZ データシート(HTML) 1 Page - Analog Devices |
1 / 24 page Low Power, 16-/24-Bit Sigma-Delta ADC for Bridge Sensors AD7796/AD7797 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 ©2006 Analog Devices, Inc. All rights reserved. FEATURES RMS noise: 65 nV Instrumentation amp Temperature sensor Internal clock oscillator Simultaneous 50 Hz/60 Hz rejection Update rate: 4.17 Hz to 123 Hz Current: 250 μA typ Power-down: 1 μA Power supply: 2.7 V to 5.25 V –40°C to +85°C temperature range Independent interface power supply 16-lead TSSOP INTERFACE 3-wire serial SPI®, QSPI™, MICROWIRE™, and DSP compatible Schmitt trigger on SCLK APPLICATIONS Weigh scales Strain gages Industrial process control Instrumentation Portable instrumentation GENERAL DESCRIPTION The AD7796/AD7797 are complete, analog front ends for high precision, bridge sensor applications such as weigh scales. The AD7796/AD7797 contain a Σ-Δ ADC capable of 16-/24-bit resolution, respectively. The on-chip instrumentation amplifier has a fixed gain of 128, allowing small amplitude signals such as those from bridge sensors to be directly interfaced to the ADC. Each part has one differential input and contains a temperature sensor that is internally connected to the ADC. This sensor can be used to perform temperature compensation of the bridge. The devices can be operated with the internal clock or an external clock. The output data rate from the parts is software- programmable and can be varied from 4.17 Hz to 123 Hz. The AD7796/AD7797 operate with a power supply from 2.7 V to 5.25 V. Each part consumes a current of 250 μA typical and is housed in a 16-lead TSSOP. FUNCTIONAL BLOCK DIAGRAM AD7796/ AD7797 DOUT/RDY DIN SCLK AIN(+) AIN(–) MUX GND Σ-Δ ADC AVDD ×128 REFERENCE TEMP SENSOR INTERNAL CLOCK GND AVDD REFIN(–) REFIN(+) CLK AD7796: 16-BIT ADC AD7797: 24-BIT ADC SERIAL INTERFACE AND CONTROL LOGIC CS DVDD Figure 1. |
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同様の説明 - AD7796BRUZ |
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