ADI AD5933高精度阻抗测量解决方案CN0217

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 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
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