16路并行数据采集存储及显示

1、基于FPGA的16路并行数据采集存储及显示系统方案报告本系统实现对16路模拟信号的采集、存储、显示。16路模拟信号的选择可 以通过FPGA多通道选择控制模块实现，选通的模拟信号经过信号调理模块送给 模式转换器，模数转换接口由FPGA中的ADC控制模块实现，采集的数据经FIFO 进行数据缓存，此时采集到的数据可以通过R232串口发送，PC机接收的数据可以通过串口调试工具观察各个通道数据。数据缓存的数据进行FFT运算后的 结果由存储控制模块存到SD卡或者U盘里。另外数据处理的结果可以经过DA 转换转化为模拟信号，可以通过示波器观察输入和经过数据处理后输出的模拟信 号的差别。经过数据处理后的结果可以

2、通过VGA控制模块在显示器上显示，也 可以通过外部的USB从口芯片将数据送给PC机。系统总体框图如图一所示，1)ADC选型本系统采集的16路频率是50khz模拟信号，要求精度为12位以上。根据奈奎斯特率和 工程应用的经验，要求ADC的采样率至少应该在500K以上，关于多路并行数据采集电路 的设计，一种是选择多通道AD，这样可以使用单个16通道ADC。如果选择此方案在ADI、 TI、Maxim、NS 公司的产品中 16 通道的 ADC 有 TI 的 ADS1158(16bit)、ADS1258(24bit)、 ADS7953(12bit)，见表二。但是总的采样率只有125K和1M，不能满足单通道

3、至少500k的 要求。ADI公司的有AD5590、AD7490，见表三，Maxim的ADC见表四，同样单通道采样 速率也达不到要求，NS公司见表五在精度和采样速度上多不能满足要求。表一 TI芯片表二ADI芯片表三Maxim芯片总计器件=370 匹配型号：6Resolution (bits)Input Chan.Conv. Rate (ksps)Data Bus (bits)Internal VREF W)External VREF (V)Unipolar V|N (V)PriceADCmaxnominalminmaxmaxSee Notos当前迭择：=12=16-1-Wire or Pc or

4、 SPI0 MAX11632 16-Channel, 12-bit 300ksps ADCs with FIFO, Internal Reference1216300SPI4.09615.254.096$4.00 1k0 MAX11&J3 16-Channel, 12-bit 300ksps ADCs with FIFO, Internal Reference1216300SPI2.513.62.5$4.00 1k0 MAX1257 12-bit, Multichannel ADCs/DACs with FIFO, Temperature Sensor, and GPIO Ports12163

5、00SPI2.513.62.5$14.49 1k3 FJAX1258 12-bit, Multichannel ADCs/DACs with FIFO, Temperature Sensor, and GPIO Ports1216300SPI4.09615.254.096$14.49 1k0 MAX1230 16-Channel, 12-bt 300ksps ADCs with FIFO, Temp Sensor, Internal Reference1216300SPI4.09615.254.096$5.43 1kQ MAX1231 16-Channel, 12-bt 300ksps ADC

6、s with FIFO, Temp Sensor, hternal Reference1216300SPI2.513.62.5$5.43 1k表四NS芯片PartPin and Function CompatibleResolution (bits)Input Channels (Count)Sample RateRange (spsInterface TypeDifferentialPower Down, typ. at 3.6V (uW)Operating Power, typ at 3.6V, max kspsOperating Powr, 3.6V, Iksps, max.PowerW

7、iseRating 1 (pj/conv)Price(lK US$)*PackagingADC0816816ParallelNoB.7400MDIPADC0817816ParallelNo5.1500MDIP也可以选择多片ADC的并行来实现，可以用两片8通道，这样要求每个通道的采样率 也应为500k以上，表五、六、七、八是八通道的产品。表六TI芯片ADS833216500 kSPS8Ext24VQFN6.50 | 1ku2.7V-5.5V、16 位 500KSPS 低功耗串行ADC、8通道MUX和输出ADS7951121MSPS8Ext24VQFN, 30TSSOP2.70 11ku12位、1

8、MSPS、8通道、单端、微功耗、串行接口、SARADCADS785212500kSPS8I nt and ExtYes32TQFP3.40 | 1ku12位8通道并行输出模数转换器ADS52821265MSPS8I nt and Ext64VQFN48.20 | 1ku8-Channel, 12-bit, 65MSPS Analog-to- Digital ConverterADS52811250MSPS8I nt and Ext64VQFN, 80HTQFP46.10| 1ku8-Channel, 12-bit, 50MSPS Analog-to- Digital ConverterADS5

9、2731270MSPS8I nt and Ext80HTQFP151.25|1ku具有串行化LVDS接口的8通道12位 70MSPS ADCADS52721265MSPS8I nt and Ext80HTQFP68.60 | 1ku8通道65MSPS模数转换器ADS52711250MSPS8I nt and Ext80HTQFP60.00 | 1ku具有串行化LVDS接口的8通道、12位、40/50MSPS 的 ADCADS52701240MSPS8I nt and Ext80HTQFP55.00 11ku8通道模数转换器Part Number ResolutioDescriptionPara

10、llelApprox.# Input ChannelsInterfac Pin/Package Pricen (Bits) Sample Rate (max)Reference Mode e(US$)表七ADI芯片Product DescriptionAD7891AD7938-6AD7928AD7938AD9273-25AD9271-25AD9271-40AD927340AD927240AD922240AD9222-50AD9273-50AD9271-60AD9272-65AD9222-65AD9276AD9272-80AD7327AD7328AD7329AD9252AD7699Resolut

11、 ion 8-Channel, Serial/Parallel, 1 心28-Channel. 625 kSPS. 12-Bit r12 8-Channel. 1 MSPS, Serial-Oirl28-Channel. 1.5 MSPS. 12- & %28-ch. Lo Noise Amp/VGA/A-Arl2 8-ch. Lo Noise Pre-amp/VGA/rl2 8-ch. Lo Noise Pre-amp/VGA/i28-ch, Lo Noise Amp/VGA/A-A，12 8-ch. Lo Noise Amp/VGA/A-A，12 Octal. 12-bit. 40 MSP

12、S Serial% Octal. 12-bit. 40 MSPS Serial8-ch, Lo Noise Amp/VGA/A-A，12 8-ch. Lo Noise Pre-amp/VGA/i28-ch. Lo Noise Amp/VGA/A-Ar12 Octal. 12-bit, 65 MSPS Serial% Octal. Low Noise/VariableGaiil28-ch, Lo Noise Amp/VGA/A-A，i2500 kSPS, 8-Channel. Softwa%3Software Selectable. True Bip%3 1 MSPS . 8-Channel,

13、True Bi3Octal, 14-bit, 60 MSPS Serial% 16-Bit. 8-Channel. 500 kSPS %6T-Put Rate500kSPS625kSPS 1MSPS 1.5MSPS 25MSPS 25MSPS 40MSPS 40MSPS 40MSPS 40MSPS 50MSPS 50MSPS 50MSPS 65MSPS 65MSPS 80MSPS 80MSPS 500kSPS 1MSPS 1MSPS 50MSPS 500kSPSFull Pwr BWSupply VPwr DissOperating Temp RanqePrice* (1000 pcs.n/a

14、Single(+5)100miW-40 to +105514 5GSing回+25); Sir-40 to +85U.918.2MHzSingle(+3); Sing 13.5mW-40 to +85U.8120MHzSingle(+3); Sing 16mW-40 to +857.4470MHzMulti(+1 8An+3 819mW-40 to +85n/a.Single(+1.8)1.1W-40 to +85U0.48n/a.Single(+1.8)1.19W-40 to +85U0.4870MHzMulti(+1.8An+3 873mW-40 to +85$51.00100MHzMul

15、ti(+1.8An+31.56W-40 to +8554.00325MHzMulti(+1.8Anlg.ZOOmiW-40 to +85U0.48325MHzMulti(+1_8Anlg.740miW-40 to +85U0.4870MHzMulti(+1.8An+3 943mW-40 to +85$51.00n/aSingle(+1.8)1.1W-40 to +85U0.48100MHzMulti(+t8An+31.69W-40 to +8554.00325MHzMulti(+1.8Anlg.91。mW-40 to +85U0.48n/a.Multi(+1_8Anlg.1.78W-40 to

16、 +8562.00100MHzMulti(+1.8An+31.78W-40 to +8554.0022MHzMulti(12? +5); M7mW-40 to +85$3-9922MHzMulti(12. +5); h29mW-40 to +856.3320MHzMulti(12, +3);30mW-40 to +85号6一33325MHzSingle(+1.8)773 mW-40 to +8554.6514MHzMulti(+5Anlg. +：32mW-40 to +85$7一99#ChanTI、ADI的1.5M以下的芯片没有给出单通道的采样率，高速的ADC给出了单通道采样率一般是在10M以

17、上。表八 Maxim 芯片总计器件：370 匹配型号：6Resolution(bits)Input Chan.Conv. Rate (ksps)Package/PinsPriceADCmaxSee Notes当前迭择：=12 or 14=3N526N MAX1312 8-Channel 12-bit Simultaneuos Sampling ADCs with +/-10V input range12S1075LQFP/48$10.49 1kN MAX1316 -Channel 14-bit Simultaneuos Sampling ADCs with 0-5V input range14

18、8526LQFP/48513.11 1k2 MAX1320 S-Channel 14-bit Simultaneuos Sampling ADCs with +/-5V input range148526LQFP/48513.11 1k日 MAX1324 &-Channel 14-bit Simultaneuos Sampling ADCs with +/-10V input range148526LQFP/4B513.11 1kN MAX1304 8-Channel 12-bit Simultaneuos Sampling ADCs with 0-5V input range12S1075L

19、QFP/4858.39 1kN MAX1308 8-Channel 12-bit Simultaneuos Sampling ADCs with +/-5V input range12S1075LQFP/48$10.49 1kMaxim给出了单通道的采样率 MAX1312、MAX1304、MAX1308八通道同时采样的单通道采样率为456K，可以考虑应用。其他的八通道同时采样的单通道采样率为250k。另外也可以选用四个四通道芯片并行，各厂商芯片见表九、十、十一、十二。表九TI公司芯片B|C|D|E|FPart Number Resolution (Bits) Sample Rate (max)

20、 # Input Channels CommentsDescriptionTHS1207126MSPS412位，6MSPS同步采样四通道ADC ; 包括并行DSP/uP I/F通道自动扫描THS1206126MSPS412位6MSPS ADC ,具有四通道（配 置）,DSP/uP IF ,集成 16xFIFO、信道 自动扫描功能和低功耗模式ADS7950121MSPS412位、1MSPS、4通道、单端、微功耗、串行接口、SARADCADS7863122MSPS4双路、2MSPS、12位、3+3或2+2通道 、同步采样模数SAR转换器ADS786212500kSPS4250 kSPS per c

21、hannel双路500kHz 12位2+2通道同步采样模 数转换器ADS786112500kSPS4250 kSPS per channel双路500kHz 12位2+2通道同步采样模 数转换器ADS836116500kSPS4250 kSPS per channel4通道串行输出16位500kSPS 2 ADCADS833116500kSPS42.7V-5.5V 16位500KSPS低功耗串行ADCADS8254161MSPS416位4通道差动完整果集解决方案（ADCs REF和输入缓冲器）|S8284181MSPS4具有板载ADC驱动器OPA的18位、 1MSPS、4通道、准双极差动ADC

22、表十ADI公司芯片ProductDescriptionResolution(Bits)T Put Rate# ChanFuH Pwr BWSupply VPwr DissOperating Temp RanqePrice* (WOO pcs.)AD78644-Channel, 520520kSPSA3MHzSingle(+5)120mW-40 to +85$13E1AD7934-64-Channel, 625625kSPSSingle(+2.5); Sir-40 to +8534.66AD7366True Bipolar lnpiF121MSPS35MHzMulti(12. +5): h88.

23、8mW-40 to +855.99AD7866Dual. 1 MSPS, ：r121MSPS12MHzSingle(+3); Sing24miW-40 to +856.02AD79244-Channel, 1 MSr121MSPSa8.2MHzSingle(+3); Sing13.5mW-40 to +8534.55AD79344-Channel, 1.5 防21.5MSPS20 MHzSingle(+3); Sing16mW40 to +85V.19AD7323500 kSPS, 4-Ch%3500kSPS222MHzMulti(12, +5); M7mW40 to +8533.66AD73

24、24Software Select占31MSPS222MHzMulti(12, +5)： h30mW40 to +8535.82AD7367Bipolar Input, Di%41MSPS235MHzMulti(土 12, +6)： h88 7mW-25 to +8536.98AD7654Dual, 2-Channelr16SOOkSPS210MHzSingle(+5)135mW-40 to +8515.61AD76554-Channel, 1MS%61MSPS210MHzSingle(+5)135mWV0 to+85宙 $9.56在多通道同时采样时单通道的采样率还是比较低的。表十一 Maxi

25、m 芯片 在maxim的上面的几个系列芯片，MAX11043是4路单端或差分、16位同时采样 ADC。MAX11043每通道包含通用的滤波器模块和可编程增益放大器(PGA)。每 通道ADC采样速率可达800ksps，通过40MHz串口与器件通信。SPItm接口支 持1600ksps直通速率，即4路、每通道400ksps或2路、每通道800ksps的速率。 MAX1316-MAX1318/MAX1320-MAX1322/MAX1324-MAX1326 系列 8 通道转 换 时 吞 吐 率 为 每通道 250ksps 。Internal VREF当前迭择：S8.03 1k33.75 1 k$3.7

26、5 1 kTQFN/20-40 to +B5LQFP/4836.54 1k-40 to +85LQFP/4837.95 1 k-40 to +B5LQFP/4857.95 1 kS9.83 1k$9.83 1 k-40 to +85S9.83 1k总计器件：370 匹配型号：10ADCs with PGA, Filter, and &712-bit Dual-Stage DAC 0 MAX1377 Dual 12-bit,1.25 Msps, 2-ChannelDifferential/ 4-Channel Single-ended Input, Simultaneously Sampling

27、 ADC0 MAX1379 Dual 12-bit,1.25 Msps, 2-ChannelDifferential/ 4-Channel Single-ended Input, Simultaneously Sampling ADC回 MAX1383 Duall2-bit, 1.25 Maps, 2-ChannelDifferential/ 4-Channel Single-ended Input, Simultaneously Sampling ADC回 MAX1305 4-Channel 12-bit Simukaneuos SamplingADCs with 0-5V input ra

28、nge回 MAX1309 4-Channel 12-bit Simultaneuos SamplingADCs with +/-5V input range回 MAX1313 4-Channel 12-bit SimuRaneuos SamplingADCs with +/-10V input rangeQ MAX1317 4-Channel 14-bit Simultaneuos SamplingADCs with 0-5V input range回 MAX1321 4-Channel 14-bit Simultaneuos SamplingADCs with +/-5V input rangeQ MAX1325 4-Channel 14-b# Simukaneuos SamplingADCs with +/-10V input range-40 to +125-40 to +B5TQFN/20LQFP/48MAX1304-MAX1306/MAX1308-MAX1310/MAX1312-MAX1314 为 12 位模数转 换器(ADC)，具有独立的8、4或2路输入通道。独立的采样/保持(T/H)电路能为 每个通道提供同时采样。MAX1304/MAX1305/MAX1306提供0至+