ADC-ADS1255实现23Bits有效位的应用.pdfVIP

文章编号：1001—9944(2011)02-0057--04 ADC—ADS1255实现23Bits有效位的应用 周传文，庹先国，奚大顺，李怀良，王洪辉 (成都理X-大学核技术与自动化X-程学院，成都610059) 摘要：文中介绍了24BitsZ—A型模数转换器ADSl255主要特性。利用ADSl255典型单极性 输入电路和AD8138单极一差分变换器构成的差分输入电路．采用AD580M高性能芯片的参 考电压电路、优化了供电电源纹波处理方法、注意了印刷电路板的设计，最后在恒温下对 ADSl255采集板进行有效位数测试。结果表明，单极性输入采样率为2．5SPS时．有效位数 (ENOB)达到22．6Bits。 关键词：ADSl255；有效位数；AD580M；模数转换器 中图分类号：TN79文献标志码：A in 23BitsofENOB ADC-ADSl255 Applied Achieving ZHOU Chuan-wen，TUODa·shun，LI Xian·guo，XI Huai—liang，WANGHong—hui of Nuclear andAutomation of (CollegeApplied Technology Engineering，ChengduUniversityTechnology．Chengdu 610059，China) introducesthemainfeaturesof24-bitsX-A converterADSl255．The Abstract：This design8p- paper analog-to--digital theADSl255 circuitanddifferentialcircuitconsistedoftheAD8138 plies typicalsingle-endedinput input single--ended- to-differentialconversion．Thena referencecircuit AD580M designhigh-performancevoltage byusing chip，meanwhile the tothe of testthe attention the circuit optimizesupplypowerrippleapproach．andpay design printed board．Finally numberof theADSl255dam boardin constant reSults effective bits(ENOB)of acquisitionthe temperature．Thetesting theeffectivenumberofbitsreachesto226Bitswhenthe rateis2．5SPS． showthat single--endedinputssampling numberof words：ADSl255；effectivebits(ENOB)；AD580M；ADC Key 在数据采集和精密测量仪器领域．需对模拟 量进行精确采