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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD7739BRU-REEL датащи(PDF) 1 Page - Analog Devices |
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AD7739BRU-REEL датащи(HTML) 1 Page - Analog Devices |
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1 / 32 page  8-Channel, High Throughput, 24-Bit ∑-∆ ADC AD7739 FEATURES High resolution ADC 24 bits no missing codes ±0.0015% nonlinearity Optimized for fast channel switching 18-bit p-p resolution (21 bits effective) at 500 Hz 16-bit p-p resolution (19 bits effective) at 4 kHz On-chip per channel system calibration Configurable inputs 8 single-ended or 4 fully differential Input ranges +625 mV, ±625 mV, +1.25 V, ±1.25 V, +2.5 V, ±2.5 V 3-wire serial interface SPI®, QSPI™, MICROWIRE™, and DSP compatible Schmitt trigger on logic inputs Single-supply operation 5 V analog supply 3 V or 5 V digital supply Package: 24-lead TSSOP APPLICATIONS PLCs/DCSs Multiplexing applications Process control Industrial instrumentation GENERAL DESCRIPTION The AD7739 is a high precision, high throughput analog front end. True 16-bit p-p resolution is achievable with a total conversion time of 250 µs (4 kHz channel switching), making it ideally suited to high resolution multiplexing applications. The part can be configured via a simple digital interface, which allows users to balance the noise performance against data throughput up to 15 kHz. The analog front end features eight single-ended or four fully differential input channels with unipolar or bipolar 625 mV, 1.25 V, and 2.5 V input ranges. It accepts a common-mode input voltage from 200 mV above AGND to AVDD – 300 mV. The differential reference input features “No-Reference” detect capability. The ADC also supports per channel system calibration options. FUNCTIONAL BLOCK DIAGRAM SCLK DIN DOUT CS RDY RESET SERIAL INTERFACE CONTROL LOGIC AIN4 AIN5 AIN6 AIN7 MUX AINCOM/P0 AIN0 AIN1 AIN2 AIN3 REFERENCE DETECT REFIN(–) REFIN(+) I/O PORT SYNC/P1 CLOCK GENERATOR 24-BIT Σ-∆ ADC BUFFER AD7739 CALIBRATION CIRCUITRY DGND DVDD MCLKIN MCLKOUT AGND AVDD 03742-0-001 Figure 1. The digital serial interface can be configured for 3-wire operation and is compatible with microcontrollers and digital signal processors. All interface inputs are Schmitt triggered. The part is specified for operation over the extended industrial temperature range of –40°C to +105°C. Other parts in the AD7739 family are the AD7738, AD7734, and AD7732. The AD7738 is similar to the AD7739 but has higher speed (8.5 kHz channel switching for 16-bit performance) and higher AIN leakage current. The AD7738 multiplexer output is pinned out externally, allowing the user to implement programmable gain or signal conditioning before being applied to the ADC. The AD7734 analog front end features four single-ended input channels with unipolar or true bipolar input ranges to ±10 V while operating from a single +5 V analog supply. The AD7734 accepts an analog input overvoltage to ±16.5 V without degrading the performance of the adjacent channels. The AD7732 is similar to the AD7734, but its analog front end features two fully differential input channels. 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 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 companies. 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 © 2003 Analog Devices, Inc. All rights reserved. |
Аналогичный номер детали - AD7739BRU-REEL |
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Аналогичное описание - AD7739BRU-REEL |
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