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AD7713 数据表(PDF) 1 Page - Analog Devices |
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AD7713 数据表(HTML) 1 Page - Analog Devices |
1 / 28 page REV. D 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. 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 Analog Devices, Inc. All rights reserved. AD7713 LC2MOS Loop-Powered Signal Conditioning ADC FEATURES Charge Balancing ADC 24 Bits No Missing Codes 0.0015% Nonlinearity 3-Channel Programmable Gain Front End Gains from 1 to 128 2 Differential Inputs 1 Single-Ended High Voltage Input Low-Pass Filter with Programmable Filter Cutoffs Ability to Read/Write Calibration Coefficients Bidirectional Microcontroller Serial Interface Single-Supply Operation Low Power (3.5 mW typ) with Power-Down Mode (150 W typ) APPLICATIONS Loop Powered (Smart) Transmitters RTD Transducers Process Control Portable Industrial Instruments CMOS construction ensures low power dissipation, and a hard- ware programmable power-down mode reduces the standby power consumption to only 150 µW typical. The part is available in a 24-lead, 0.3 inch wide, PDIP and CERDIP as well as a 24- lead SOIC package. PRODUCT HIGHLIGHTS 1. The AD7713 consumes less than 1 mA in total supply current, making it ideal for use in loop-powered systems. 2. The two programmable gain channels allow the AD7713 to accept input signals directly from a transducer removing a considerable amount of signal conditioning. To maximize the flexibility of the part, the high level analog input accepts 4 VREF signals. On-chip current sources provide excitation for 3-wire and 4-wire RTD configurations. 3. No missing codes ensures true, usable, 24-bit dynamic range coupled with excellent ±0.0015% accuracy. The effects of temperature drift are eliminated by on-chip self-calibration, which removes zero-scale and full-scale errors. 4. The AD7713 is ideal for microcontroller or DSP processor applications with an on-chip control register, which allows control over filter cutoff, input gain, signal polarity, and calibration modes. The AD7713 allows the user to read and write the on-chip calibration registers. GENERAL DESCRIPTION The AD7713 is a complete analog front end for low frequency measurement applications. The device accepts low level signals directly from a transducer or high level signals (4 VREF) and outputs a serial digital word. It employs - conversion technique to realize up to 24 bits of no missing codes performance. The input signal is applied to a proprietary pro- grammable gain front end based around an analog modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be programmed via the on-chip control register, allowing adjustment of the filter cutoff and settling time. The part features two differential analog inputs and one single- ended high level analog input as well as a differential reference input. It can be operated from a single supply (AVDD and DVDD at 5 V). The part provides two current sources that can be used to provide excitation in 3-wire and 4-wire RTD configurations. The AD7713 thus performs all signal conditioning and conver- sion for a single-, dual- or three-channel system. The AD7713 is ideal for use in smart, microcontroller-based systems. Gain settings, signal polarity, and RTD current control can be configured in software using the bidirectional serial port. The AD7713 contains self-calibration, system calibration, and background calibration options and also allows the user to read and to write the on-chip calibration registers. FUNCTIONAL BLOCK DIAGRAM CHARGING BALANCING ADC AUTO-ZEROED - MODULATOR DIGITAL FILTER CLOCK GENERATION AD7713 AGND DGND MCLK OUT MCLK IN AIN1(+) AIN1(–) AIN2(+) REF IN(+) AVDD DVDD AVDD 1 A A = 1 – 128 STANDBY AIN2(–) REF IN(–) SYNC RTD2 RTD1 PGA AVDD 200 A 200 A SERIAL INTERFACE CONTROL REGISTER OUTPUT REGISTER MODE SDATA A0 DRDY TFS RFS SCLK AIN3 INPUT SCALING |
类似零件编号 - AD7713 |
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类似说明 - AD7713 |
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