AN-835--高速ADC测试和评估

高速ADC测试和评估OneTechnologyWay•P.O.Box9106•Norwood,MA02062-9106•Tel:[phone]•Fax:[phone]•|Page1of24ROHDE&SCHWARZ,SMHU,2Vp-pSIGNALSYNTHESIZERROHDE&SCHWARZ,SMHU,2Vp-pSIGNALSYNTHESIZERBAND-PASSFILTERUSBCONNECTION05941-001HSC-ADC-EVALB-DCFIFODATACAPTUREBOARDPCRUNNINGADCANALYZER–+3.3VGNDVCC6VDC2AMAXWALLOUTLET100VTO240VAC47HzTO63HzCHBPARALLELCMOSOUTPUTSEVALUATIONBOARDCHAPARALLELCMOSOUTPUTSXFMRINPUTCLKSWITCHINGPOWERSUPPLYSPISPISPIADCFIFO套件CLOCKINPUTFILTEREDANALOGINPUTSINGLEORDUALHIGH-SPEEDADCEVALUATIONBOARD120-PINCONNECTORHSC-ADC-EVALB-SCORHSC-ADC-EVALB-DCCLOCKCIRCUITLOGICSPIADCnnSPI+3.0VREGPSCHBFIFO,32K,133MHzTIMINGCIRCUITCHAFIFO,32k,133MHzUSBCTLRPSREGSTANDARDUSB2.005941-002应用笔记作者：BradBrannon和RobReeder应用范围本应用笔记将介绍ADI公司高速转换器部门用来评估高速ADC的特征测试和生产测试方法。本应用笔记仅供参考，不能替代产品数据手册。动态测试硬件设置SNR、SINAD、最差杂散和IMD均通过类似于图1的硬件设置进行测试。在生产测试中，测试硬件均高度集成，但硬件原理都是一样的。动态测试的基本设置包括一个信号发生器、带通滤波器、测试夹具、低噪声电源、编码源(通常集成于评估板中)、数据采集模块和数据分析软件。ADI公司提供了相应的应用软件和硬件，用以在基准评估中提供帮助。请参阅“ADCFIFO套件”部分。FIFO板可通过一根标准USB线连接至个人计算机，并配合ADCAnalyzer软件对高速ADC的性能进行快速评估。用户可以查看特定模拟输入和时钟速率的快速傅立叶变换(FFT)，并对信噪比(SNR)、信纳比(SINAD)、无杂散动态范围(SFDR)和谐波数据进行分析。FIFO板有单通道和双通道两种版本可供选择。对于某一特定ADC该选择哪一版本的决定，请参阅FIFO数据手册。LVDS和串行输出器件可能需要附加一块称为HSC-ADC-FPGA的适配板。这些会在产品数据手册中特别说明。有关HSC-ADC-FPGA串行LVDS适配板、FIFO以及ADCAnalyzer软件工作原理的更多信息，请访问ADI公司网站：。高速ADCFIFO评估套件(HSC-ADC-EVALA-SC/HSC-ADC-EVALA-DC和HSC-ADC-EVALB-SC/HSC-ADC-EVALB-DC)包括一块存储板，用以获取来自ADI公司高速模数转换器(ADC)评估板和ADCAnalyzer™件的数字数据块。有关ADCFIFO评估套件的更多信息，请访问：。图2典型ADIADCFIFO套件设置图1典型特征测试设置AN-835Rev.0|Page2of24目录修订历史4/06—版本0：初始版应用范围...........................................................................................1动态测试硬件设置...........................................................................1ADCFIFO套件..................................................................................1修订历史...........................................................................................2背景知识...........................................................................................3ADIsimADC...............................................................................3模拟信号源..............................................................................4模拟信号滤波器.......................................................................4编码信号源..............................................................................5电源...........................................................................................6数据采集..................................................................................6交流测试定义...................................................................................7FFT测试...................................................................................7单音FFT...................................................................................7双音FFT...................................................................................9噪声功率比(NPR,dB)..........................................................10全功率带宽(MHz)..................................................................11抖动测试.................................................................................12模拟输入.................................................................................13模拟输入满量程范围(Vp-p)...............................................14共模输入范围(V)....................................................................15共模抑制比(CMRR,dB)..........................................................15孔径延迟(ps)............................................................................16孔径抖动或孔径不确定度(psRMS).......................................17串扰(dB)...................................................................................17等效输入噪声(LSBRMS)........................................................17范围外恢复时间(时钟周期)...................................................17数字时域.................................................................................17转换误码率(CER)....................................................................19直流测试定义................................................................................20增益误差(%FS)........................................................................20增益匹配(%FS)........................................................................20失调误差(%FS)........................................................................20失调匹配(mV).........................................................................20温度漂移(ppm)........................................................................20高电平输出电压/低电平输出电压(VOH/VOL,V)...............20线性度.....................................................................................20电源抑制比(PSRR,dB).............................................................22参考资料..........................................................................................23AN-835Rev.0|Page3of24背景知识6VSWITCHINGPOWERSUPPLYCONNECTIONONBOARD+3.3VREGULATOROPTIONALPOWERCONNECTIONUSBCONNECTIONTOCOMPUTERµCONTROLLERCRYSTALCLOCK=24MHz,OFFDURINGDATACAPTURERESETSWITCHWHENENCODERATEISINTERRUPT