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文档下载 免费文档下载 http://doc.xuehai.net/ ADI AD5933 高精度阻抗测量解决方案 CN0217 本文档下载自文档下载网,内容可能不完整,您可以复制以下网址继续阅读或下载: http://doc.xuehai.net/bbbc5952521101746899a706b.html ADI AD5933 高精度阻抗测量解决方案 CN0217 ADI AD5933 高精度阻抗测量解决方案 CN0217 关键字:工业控制,测试仪表, 阻抗测量 ADI 公司的高精度阻抗测量解决方案 CN0217 采用 12 位阻抗转换器 AD5933/AD5934. AD5933 是 1MSPS 的 12 位 ADC,而 AD5934 是 250KSPS 的 12 位 ADC,内部集成了温度传感器(±2°C), 系统精度 0.5%,工作电压 2.7V-5.5V,图 1 的电路优化了信号链,其阻抗测量范围从低欧姆数到 几百 kΩ,主要用在电化学分析,生物阻抗分析,复数阻抗分析,生物和汽车传感器,接近式检测, 非破坏性检测,以及材料特性分析和燃料/电池状态监视等.本文介绍了 AD5933 主要特性, 功 能方框图, 病毒株血样本测量框图和 AD5933 评估板主要特性,电路图与材料清单. The AD5933 and AD5934 are high precision impedance converter system solutions that combine an on-chip programmable frequency generator with a 12-bit, 1 MSPS (AD5933) or 250 kSPS (AD5934) analog-to-digital converter (ADC). The tunable frequency generator allows an external complex impedance to be excited with a known frequency. The circuit shown in Figure 1 yields accurate impedance measurements extending from 文档下载 免费文档下载 http://doc.xuehai.net/ the low ohm range to several hundred kΩ and also optimizes the overall accuracy of the AD5933/AD5934. 图 1.高精度阻抗测量优化信号链的电路图 The AD5http://doc.xuehai.net/bbbc5952521101746899a706b.html933 is a high precision impedance converter system solution that combines an on-board frequency generator with a 12-bit, 1 MSPS, analog-to-digital converter (ADC). The frequency generator allows an external complex impedance to be excited with a known frequency. The response signal from the impedance is sampled by the on-board ADC and a discrete Fourier transform (DFT) is processed by an on-board DSP engine. The DFT algorithm returns a real (R) and imaginary (I) data-word at each output frequency. Once calibrated, the magnitude of the impedance and relative phase of the impedance at each frequency point along the sweep is easily calculated. This is done off chip using the real and imaginary register contents, which can be read from the serial I2C interface. A similar device, also available from Analog Devices, Inc., is the AD5934, a 2.7 V to 5.5 V, 250 kSPS, 12-bit impedance converter, http://doc.xuehai.net/bbbc5952521101746899a706b.htmlwith an internal temperature sensor and is packaged in a 16-lead SSOP. 文档下载 免费文档下载 http://doc.xuehai.net/ AD5933 主要特性: Programmable output peak-to-peak excitation voltage to a maximum frequency of 100 kHz Programmable frequency sweep capability with serial I2C interface Frequency resolution of 27 bits ( Impedance measurement range from 1 kΩ to 10 MΩ Capable of measuring of 100 Ω to 1 kΩ with additional circuitry Internal temperature sensor (±2℃) 文档下载 免费文档下载 http://doc.xuehai.net/ Internal system clock option Phase measurement capability System accuracy of 0.5% 2.7 V to 5.5 V power supply operation Temperature range: ?40℃ to 16-lead SSOP package AD5933 应用: Electrochemical analysis 125℃ 文档下载 免费文档下载 http://doc.xuehai.net/ Bioelectrical imhttp://doc.xuehai.net/bbbc5952521101746899a706b.htmlpedance analysis Impedance spectroscopy Complex impedance measurement Corrosion monitoring and protection equipment Biomedical and automotive sensors Proximity sensing Nondestructive testing Material property analysis 文档下载 免费文档下载 http://doc.xuehai.net/ Fuel/battery cell condition monitoring 图 2. AD5933 功能方框图 图 3. 采用 AD5933 的病毒株血样本测量框图 AD5933 评估板 This document describes the evaluation board for the AD5933 and the application software developed to interface to the device. The AD5933 is a high precision impedance converter system that combines an on-board frequency generator with a 12-bit, 1 MSPS ADC. The frequency generator allows an external complex impedance to be excited with a known frequency. The response signal from the impedahttp://doc.xuehai.net/bbbc5952521101746899a706b.htmlnce is sampled by the on-board ADC, and the DFT is processed by an on-board DSP engine at each excitation frequency. The AD5933 also contains an internal temperature sensor with 文档下载 免费文档下载 http://doc.xuehai.net/ 13-bit resolution and operates from a 2.7 V to 5.5 V supply. Other on-board components include an ADR423 3.0 V reference that acts as a stable supply voltage for the separate analog and digital sections of the device and an ADP3303 ultrahigh precision regulator that acts as a supply to the on-board universal serial bus controller, which interfaces to the AD5933. The user can power the entire circuitry from the USB port of a computer. The evaluation board also has a high performance, trimmed, 16 MHz, surface-mount crystal that can act as a system clock for the AD5933, if required. The various link options available on the evaluation board are explained in Table 2. Interfacing to the AD5933 is through microchttp://doc.xuehai.net/bbbc5952521101746899a706b.htmlontroller, a USB which generates the IC signals necessary to communicate with the AD5933.The user interfaces to the USB microcontroller through a Visual Basic? graphic user interface located on and run from the user PC. More information on the AD5933 is available from Analog Devices, Inc., at www.analog.com and should be consulted when using the evaluation board. AD5933 评估板主要特性: Full-featured evaluation board for the AD5933 文档下载 免费文档下载 http://doc.xuehai.net/ Graphic user interface software with frequency sweep capability for board control and data analysis Various power supply linking options Standalone capability with serial IC loading from on-board microcontroller Selectable system clock options, including internal RC oscillator or on-board 16 MHz crystal AD5933 评估板应用: Electrochemical analysis Impedance spectroscopy://doc.xuehai.net/bbbc5952521101746899a706b.html 22 文档下载 免费文档下载 http://doc.xuehai.net/ Complex impedance measurement Corrosion monitoring and protection equipment Biomedical and automotive sensors Proximity sensing 图 4.AD5933 评估板方框图 图 5. EVAL-CN0217-EBIZ 电路图(1) 图 6. EVAL-CN0217-EBIZ 电路图(2) 图 7. EVAL-CN0217-EBIZ 电路图(3) 文档下载 免费文档下载 http://doc.xuehai.net/ 文档下载网是专业的免费文档搜索与下载网站,提供行业资料,考试资料,教 学课件,学术论文,技术资料,研究报告,工作范文,资格考试,word 文档, 专业文献,应用文书,行业论文等文档搜索与文档下载,是您文档写作和查找 参考资料的必备网站。 文档下载 http://doc.wendoc.com/ 亿万文档资料,等你来免费下载