摘要
高精度测试仪器在环境试验中扮演着重要角色,而积分型AD转换器被广泛的应用在高精度测试仪器中。针对传统型积分型AD转换器转换速率较低的问题,提出了一种提高转换速率的改进型多斜ⅢAD转换器,详细的介绍了其原理和设计思路。该转换器以单片机与CPLD一同控制积分型ADC,在积分末尾利用单片机片内ADC测量积分器的残留电压,以达到提高转换速率的目的。经理论分析该AD转换器比传统型转换速率快836倍,分辨率可达到31位,在±10V直流电压测量中可实现7位半分辨率。
High-precision test instruments play an important role in environmental testing,and integral AD converters are widely used in high-precision test instruments.Aiming at the problem of low conversion rate of traditional integral AD converters,an improved multi-slope III AD converter with higher conversion rate is proposed,and its principle and design idea are introduced in detail.The converter controls the integral ADC together with CPLD using singlechip microcomputer.At the end of integration,the residual voltage of the integrator is measured using the on-chip ADC of the single-chip microcomputer to achieve the purpose of improving the conversion rate.Through theoretical analysis,the AD converter is 836 times faster than the traditional one,and the resolution can reach 3i bits,which can achieve 7.5 bits resolution in±10VDCvoltagemeasurement.
作者
张航
李留生
罗期任
陈志雄
ZHANG Hang;LI Liu-sheng;LUo Qi-ren;CHEN Zhi-xiong(The 5th Electronics Research Institute of the Ministry of Industry and Information Technology of China,GuangZhou 511370)
出处
《环境技术》
2024年第5期200-204,共5页
Environmental Technology
关键词
多斜ⅢA/D
高精度
AD转换器
7位半分辨率
multi-ramp III AD conversion
high precision
AD conversion
71/2 bits resolution
