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AD7731BRUZ-REEL 数据表(PDF) 1 Page - Analog Devices |
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AD7731BRUZ-REEL 数据表(HTML) 1 Page - Analog Devices |
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1 / 44 page  REV. 0 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD7731 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997 Low Noise, High Throughput 24-Bit Sigma-Delta ADC FUNCTIONAL BLOCK DIAGRAM SIGMA- DELTA MODULATOR AD7731 SERIAL INTERFACE AND CONTROL LOGIC CLOCK GENERATION PROGRAMMABLE DIGITAL FILTER SIGMA-DELTA A/D CONVERTER BUFFER PGA 100nA AGND 100nA AVDD NC AIN1 AIN2 AIN3 AIN4 STANDBY SYNC MCLK IN MCLK OUT SCLK CS DIN DOUT RESET RDY POL DGND AGND AVDD DVDD REF IN(–) REF IN(+) MUX AIN5 AIN6 REGISTER BANK CALIBRATION MICROCONTROLLER GENERAL DESCRIPTION The AD7731 is a complete analog front-end for process control applications. The device has a proprietary programmable gain front end that allows it to accept a range of input signal ranges, including low level signals, directly from a transducer. The sigma- delta architecture of the part consists of an analog modulator and a low pass programmable digital filter, allowing adjustment of filter cutoff, output rate and settling time. The part features three buffered differential programmable gain analog inputs (which can be configured as five pseudo-differential inputs), as well as a differential reference input. The part oper- ates from a single +5 V supply and accepts seven unipolar ana- log input ranges: 0 to +20 mV, +40 mV, +80 mV, +160 mV, +320 mV, +640 mV and +1.28 V, and seven bipolar ranges: ±20 mV, ±40 mV, ±80 mV, ±160 mV, ±320 mV, ±640 mV and ±1.28 V. The peak-to-peak resolution achievable directly from the part is 16 bits at an 800 Hz output rate. The part can switch between channels with 1 ms settling time and maintain a perfor- mance level of 13 bits of peak-to-peak resolution. The serial interface on the part can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors. The AD7731 contains self-calibration and system calibration options and features an offset drift of less than 5 nV/ °C and a gain drift of less than 2 ppm/°C. The part is available in a 24-lead plastic DIP, a 24-lead SOIC and 24-lead TSSOP package. FEATURES 24-Bit Sigma-Delta ADC 16 Bits p-p Resolution at 800 Hz Output Rate Programmable Output Rates up to 6.4 kHz Programmable Gain Front End 0.0015% Nonlinearity Buffered Differential Inputs Programmable Filter Cutoffs FASTStep™* Mode for Channel Sequencing Single Supply Operation APPLICATIONS Process Control PLCs/DCS Industrial Instrumentation *FASTStep is a trademark of Analog Devices, Inc. REV. A |
类似零件编号 - AD7731BRUZ-REEL |
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类似说明 - AD7731BRUZ-REEL |
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