{"id":16573,"date":"2022-02-15T10:57:33","date_gmt":"2022-02-15T02:57:33","guid":{"rendered":"https:\/\/www.paiqinano.com\/?p=16573"},"modified":"2024-06-18T16:57:20","modified_gmt":"2024-06-18T08:57:20","slug":"%e4%bd%bf%e7%94%a8lt6018%e9%a9%b1%e5%8a%a8%e9%ab%98%e9%80%9f18%e4%bd%8d%e5%92%8c20%e4%bd%8d%e9%80%90%e6%ac%a1%e9%80%bc%e8%bf%91%e5%af%84%e5%ad%98%e5%99%a8saradc","status":"publish","type":"post","link":"https:\/\/www.paiqinano.com\/?p=16573","title":{"rendered":"\u4f7f\u7528LT6018\u9a71\u52a8\u9ad8\u901f18\u4f4d\u548c20\u4f4d\u9010\u6b21\u903c\u8fd1\u5bc4\u5b58\u5668(SAR)ADC"},"content":{"rendered":"

\u524d\u8a00<\/p>\n

LT6018 \u662f\u4e00\u6b3e\u8d85\u4f4e\u566a\u97f3\uff081kHz \u65f6 1.2nV\/\u221aHz\uff09\u3001\u6781\u4f4e\u5931\u5e27\uff081kHz \u65f6 \u2013115dB\uff09\u7684\u8fd0\u653e\u7535\u8def<\/u>\u3002\u5b83\u7684\u589e\u76ca\u5e26\u5bbd\u79ef\u4e3a 15MHz\uff0c\u8f83\u5927\u5931\u8c03\u7535\u538b\u4e3a50\u03bcV\uff0c\u8f83\u5927\u5931\u8c03\u7535\u538b\u98d8\u79fb\u4e3a 0.5\u03bcV\/\u00b0C\u3002\u8fd9\u7c7b\u4f5c\u7528\u7ec4\u6210\u4f7f\u5176\u5408\u9002\u63a8\u52a8\u591a\u79cd\u591a\u6837\u9ad8\u50cf\u7d20\u6570\u6a21\u8f6c\u6362\u5668<\/u> (ADC<\/u>)\u3002\u672c\u8bbe\u8ba1\u65b9\u6848\u5173\u952e\u70b9\u8be6\u7ec6\u4ecb\u7ecd\u5728\u5e94\u7528 LT6018 \u63a8\u52a8\u5feb\u901f 18 \u4f4d\u548c 20 \u4f4d\u9010\u6b21\u903c\u8fd1\u5b58\u50a8\u5668<\/u> (SAR)AD<\/u>C \u65f6\uff0c\u53ef\u5b8c\u6210\u6700\u597d\u9891\u7387\u7a33\u5b9a\u5ea6 (SNR) \u548c\u603b\u8c10\u6ce2\u7535\u6d41 (THD) \u7684\u7535\u6e90\u7535\u8def<\/u>\u548c\u4f18\u5316\u7b56\u7565\u3002<\/p>\n

Ultralinear 20 \u4f4d ADC<\/p>\n

\u56fe 1 \u8868\u660e DC2135A \u6f14\u8bd5\u7535\u6e90\u7535\u8def\u7684\u7834\u89e3\u7248\uff0c\u5728\u5176\u4e2d LT6018 \uff08\u53d6\u4ee3 LT1468 \uff09\u7528\u4ee5\u63a8\u52a8LTC2378-20 20 \u4f4d SAR ADC\u3002LTC2378-20 \u5177\u5907\u65e0\u4ee5\u4f26\u6bd4\u7684 2ppm \u7ebf\u6027\u3002\u8981\u5728\u5efa\u7acb\u97f3\u9891\u4fe1\u53f7\u7684\u4e00\u8d77\u7ef4\u6301\u7ebf\u6027\uff0c\u6700\u597d\u529e\u6cd5\u662f\u5e94\u7528\u672c\u6f14\u8bd5\u7ebf\u8def\u677f<\/u>\u5e94\u7528\u7684 LT5400 \u4e2d\u7684\u9ad8\u7cbe\u5bc6\u914d\u5bf9\u7535\u963b\u5668<\/u>\u3002\u56fe1 \u6240\u663e\u793a\u7535\u6e90\u7535\u8def\u7684\u8be6\u5c3d\u539f\u7406\u5ba2\u6237\u7a0b\u5e8f\u8bbe\u8ba1\u65b9\u6848\u5173\u952e\u70b91032\uff08\u5728\u5176\u4e2d\u7528 LT1468 \u63a8\u52a8 LTC2377-20\uff09\u3002<\/p>\n

\u4e3a\u4e86\u66f4\u597d\u5730\u7cbe\u786e\u6d4b\u91cf<\/u>\u7535\u6e90\u7535\u8def\u7684\u7ebf\u6027\uff0c\u5728\u952e\u5165\u4e2d\u9988\u5165\u4e00\u4e2a\u8d85\u7eaf\u6b63\u5f26\u6ce2\u5f62\uff0c\u5e76\u6d4b\u7b97\u5bfc\u51fa\u7684 FFT<\/u>\u3002\u5f97\u5230\u7684THD \u7cbe\u786e\u6d4b\u91cf\u503c\u53ef\u4ee5\u66ff\u4ee3\u7535\u6e90\u7535\u8def\u7684 INL (\u7a4d\u5206\u975e\u7ebf\u6027) \u7279\u6027\u503c\u3002\u5728 ADC \u91c7\u6837\u9891\u7387\u4e3a 800kHz \u65f6\uff0c\u5927\u5bb6\u5e94\u7528\u5927\u6982 100Hz\uff08\u7a0d\u5fae\u8c03\u8282\uff0c\u4ee5\u4fdd\u8bc1\u53d6\u6837\u7684\u4e00\u81f4\u6027\uff0c\u8fdb\u800c\u7f13\u89e3 FFT \u6807\u503c\u9650\u5b9a\uff09\u7684\u952e\u5165\u5de5\u4f5c\u9891\u7387\u3002<\/p>\n

\"o4YBAFwkg-OALBnqAABreVHjVR8927.png\"<\/p>\n

\u56fe 1. DC2135A \u6f14\u8bd5\u7ebf\u8def\u677f\u8bbe\u5b9a<\/p>\n

\u539f\u6765\u7684\u6f14\u8bd5\u7535\u6e90\u7535\u8def\u5728\u8fd0\u653e\u7535\u8def\u540e\u8fb9\u7acb\u5373\u52a0\u4e86\u4e00\u4e2a RC \u4f4e\u901a\u8fc7\u6ee4\u5668<\/u>\uff0c\u7528\u4ee5\u8fc7\u8651\u8fc7\u9ad8\u7684\u5de5\u4f5c\u9891\u7387\u566a\u97f3\u3002\u5373\u4f7f\u5728\u9ad8\u9891\u6807\u51c6\u4e0b\uff0cLT6018 \u7684\u566a\u97f3\u76f8\u5bf9\u5bc6\u5ea6\u4e5f\u7ef4\u6301\u76f8\u5bf9\u6027\u8f83\u4f4e\u7684\u6c34\u51c6\u4e0a\uff0c\u56e0\u6b64\uff0c\u6e05\u9664\u8fd9\u4e00\u8fc7\u6ee4\u5668\u51e0\u4e4e\u4e0d\u5bb9\u6613\u5bf9\u6574\u4f53\u566a\u97f3\u9020\u6210\u5371\u5bb3\u3002\u6e05\u9664\u8be5\u8fc7\u6ee4\u5668\u540e\uff0c\u7ebf\u6027\uff08\u7528 THD \u7cbe\u786e\u6d4b\u91cf\uff09\u660e\u663e\u63d0\u5347\uff0c\u7531\u4e8e\u5355\u7aef\u8f6c\u5dee\u5206\u4fe1\u53f7\u5b9e\u9645\u64cd\u4f5c\u5f7b\u5e95\u7531 LT5400\u4e2d\u7684\u9ad8\u7cbe\u5bc6\u5339\u914d\u7535\u963b\u64cd\u7eb5\uff0c\u4e0d\u4f1a\u53d7\u5230\u4e00\u5207\u4e0d\u642d\u914d\u7684\u5206\u7acb\u5143\u4ef6\u5371\u5bb3\u3002<\/p>\n

LT6018 \u7684\u4f4e\u566a\u97f3\u76f8\u5bf9\u5bc6\u5ea6\u4f7f\u5176\u5408\u9002\u7528\u4ee5\u5fc5\u987b\u6536\u83b7\u7684\u7535\u6e90\u7535\u8def\u3002\u6536\u83b7\u914d\u5907\u4e3a 10 \u65f6\uff0c\u4e0e\u603b\u4f53\u529b\u5ea6\u5bf9\u6bd4\uff0c\u7f51\u7edc\u4fe1\u53f7\u63d0\u5347 20dB\uff0cSNR \u51cf\u5c11 2dB\u3002\u5047\u5982\u952e\u5165\u6570\u636e\u4fe1\u53f7\u4e0d\u5927\uff0c\u8fd9\u7c7b\u914d\u5236\u53ef\u4ee5\u5c06\u9891\u7387\u7a33\u5b9a\u5ea6\u5408\u7406\u63d0\u534718dB\u3002\u548c\u9884\u4f30\u7684\u4e00\u6837\uff0c\u7ebf\u6027\u51cf\u5c11\u529b\u5ea6\u4e0e\u653e\u5927\u4eea<\/u>\u73af\u57ce\u8def\u6536\u83b7\u975e\u5e38\uff0c\u6216\u662f\u7ea6\u4e3a 20dB\u3002\u5b9e\u9645\u7d50\u679c\u5f52\u7eb3\u89c1\u8868 1\u3002<\/p>\n

\u8868 1. LT6018 \u63a8\u52a8 LTC2378-20 SNR \u548c THD \u7d50\u679c<\/p>\n

\"o4YBAFwkg-SAW_a0AABypZCJi_o705.png\"<\/p>\n

\u63a8\u52a8\u5feb\u901f 18 \u4f4d ADC<\/p>\n

LTC2387-18 \u662f\u4e00\u6b3e 18 \u4f4d SAR ADC\uff0c\u53d6\u6837\u901f\u5ea6\u8fbe 15Msps\u3002\u5728\u8be5\u53d6\u6837\u901f\u5ea6\u4e0b\uff0cADC \u7684\u5167\u90e8\u53d6\u6837\u7535\u5bb9\u5668<\/u>\u53ef\u4ee5\u5728\u4e0d\u4e0a 30ns \u5185\uff08\u201c\u6536\u96c6\u6642\u95f4\u201d\uff09\u8054\u63a5\u5230\u653e\u5927\u4eea\u5bfc\u51fa\u3002\u5728\u8fd9\u6bb5\u65f6\u95f4\uff0c\u653e\u5927\u4eea\uff08\u548c\u8fc7\u6ee4\u5668\uff09\u7535\u6e90\u7535\u8def\u52a1\u5fc5\u4ece\u6b63\u7535\u8377\u53cd\u51b2\u529b\u4e2d\u4fee\u590d\uff0c\u5e76\u586b\u8865\u53d6\u6837\u7535\u5bb9\u5668\u7684\u6b63\u7535\u8377\uff0c\u4fbf\u4e8e ADC \u53ef\u4ee5\u5728\u4e0b\u4e00\u4e2a\u53d8\u6362\u5468\u671f\u65f6\u95f4\u7cbe\u786e\u6d4b\u91cf\u6070\u5f53\u7684\u952e\u5165\u5de5\u4f5c\u7535\u538b\u3002\u7ec6\u5fc3\u63d0\u5347\u653e\u5927\u4eea\u548c\u8fc7\u6ee4\u5668\u4e92\u8054\u7f51\u662f\u5fc5\u9700\u7684\u3002\u5728\u56fe 2 \u4e2d\uff0c2\u4e2a LT6018 \u914d\u5907\u4e3a\u4f01\u4e1a\u6536\u83b7\u8ffd\u968f\u5668\uff0c\u5e76\u8054\u63a5\u81f3 LTC2387-18 \u6f14\u8bd5\u7ebf\u8def\u677f\uff0c\u540e\u8005\u7684 ADC \u952e\u5165\u7aef\u914d\u5907\u8fc7\u6ee4\u5668\u7535\u963b\u5668\u548c\u7535\u5bb9\u5668\u3002<\/p>\n

\u8868 2 \u8868\u660e\u5728\u952e\u5165\u7aef\u7cbe\u786e\u6d4b\u91cf\u7684 1.008kHz \u7eaf\u6b63\u5f26\u6ce2\u5f62\u7684 SNR \u548c THD \u503c\uff0c\u53ca\u5176\u5728\u76f8\u5173\u901f\u5ea6\u4e3a 14.680Msps \u65f6\u7684 ADC \u53d6\u6837\u901f\u5ea6\u3002\u8868\u683c\u4e2d\u7b2c\u4e00\u9879\u8868\u660e LT6200 \u653e\u5927\u4eea\u7d50\u679c\uff0c\u8fd9\u4e5f\u662f\u4e00\u6b3e\u5feb\u901f\u4f4e\u566a\u97f3\u8fd0\u653e\u7535\u8def\u3002\u8fc7\u6ee4\u5668\u914d\u5907\u9009\u7528\u6f14\u8bd5\u7ebf\u8def\u677f\u7684\u9ed8\u8ba4\u8bbe\u7f6e\u7f51\u7edc\u5e26\u5bbd\uff0c\u7ea6 200MHz\u3002\u8fd9\u7c7b\u914d\u5907\u9002\u7528 ADC \u6b63\u7535\u8377\u53cd\u51b2\u529b\u5f7b\u5e95\u6d88\u9664\uff0c\u8fdb\u800c\u5b8c\u6210\u4f18\u5f02\u7684 THD \u7279\u6027\uff08\u2013120dB\uff09\u3002\u53ef\u662f\uff0cSNR \u8981\u6bd4 ADC \u7684 96dB \u4f4e 2dB\u3002<\/p>\n

LT6018 \u7684\u7f51\u7edc\u5e26\u5bbd\u6bd4 LT6200 \u4f4e\uff0c\u4f46\u76f4\u6d41\u7535\u7cbe\u5bc6\u5ea6\uff08\u5931\u8861\u548c\u504f\u4f4d\uff09\u66f4\u9ad8\u4e00\u4e9b\u3002\u53ef\u662f\uff0cLT6018 \u53ef\u4f7f\u7528\u540c\u6837\u7684\u914d\u5907\uff0c\u7531\u4e8e LT6200 \u4f1a\u5927\u5e45\u5ea6\u51cf\u5c11 SNR\u548c THD\u3002SNR \u5f80\u5f80\u51cf\u5c11\uff0c\u662f\u7531\u4e8e\u653e\u5927\u4eea\u7684\u566a\u97f3\u76f8\u5bf9\u5bc6\u5ea6\u5f88\u6709\u53ef\u80fd\u8d85\u51fa\u4e0b\u8fb9\u7684\u7f51\u7edc\u5e26\u5bbd\uff0c\u5982\u679c\u4e0d\u8fdb\u884c\u8fc7\u8651\uff0c\u8be5\u566a\u97f3\u53ef\u80fd\u8fdb\u5230 ADC\u3002THD \u5f80\u5f80\u51cf\u5c11\uff0c\u662f\u7531\u4e8e\u901f\u7387\u8f83\u5feb\u7684\u653e\u5927\u4eea\uff08\u4ee5\u6ee1ADC \u6b63\u7535\u8377\u53cd\u51b2\u529b\u649e\u51fb\u65f6\uff09\u6c92\u6709\u505a\u5230\u9002\u5f53\u5e73\u7a33\u60c5\u51b5\uff0c\u4e14\u9057\u7559\u4e0b\u975e\u7ebf\u6027\u6b8b\u4f59\u7269\u4f9b ADC \u667a\u80fd\u5316\u3002<\/p>\n

\"o4YBAFwkg-SAWb9SAABmH85q4xE283.png\"<\/p>\n

\u56fe 2. LT6018 \u63a8\u52a8\u5e94\u7528 DC2290A-A \u6f14\u8bd5\u7ebf\u8def\u677f\u7684 LTC2387-18<\/p>\n

\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u63d0\u5347\u7535\u963b\u5668\u548c\u7535\u5bb9\u5668\u7684\u503c\uff0c\u53ca\u5176\u57282\u4e2a ADC \u952e\u5165\u4e2d\u95f4\u914d\u5907\u4e00\u4e2a\u5dee\u5206\u4fe1\u53f7\u7535\u5bb9\u5668\u6765\u8fc7\u8651\u5bbd\u5e26\u653e\u5927\u5668\u7684\u566a\u97f3\u3002\u8fd9\u4e00\u4e3e\u52a8\u53ef\u4ee5\u63d0\u5347\u8be5 ADC\u7684\u9891\u7387\u7a33\u5b9a\u5ea6\uff0c\u505a\u5230\u57fa\u7840\u7406\u8bba\u6700\u9ad8\u503c 96dB\uff0c\u8fd9\u4ee3\u8868\u7740\u96c6\u6210\u5316\u653e\u5927\u4eea\u7684\u566a\u97f3\u53ef\u4ee5\u5ffd\u7565\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u9488\u5bf9\u8fc7\u6ee4\u5668\u914d\u5907\uff0c\u8d8b\u5411\u4e8e\u6311\u9009\u8f83\u5c0f\u7684\u4e32\u8054\u7535\u963b\u548c\u66f4\u9ad8\u7684\u7535\u5bb9\u5668\u65f6\uff0c\u6b63\u7535\u8377\u53cd\u51b2\u529b\u7684\u539f\u59cb\u6548\u7528\u4f1a\u88ab\u53d8\u5f31\uff0cTHD \u7279\u6027\u56e0\u6b64\u83b7\u5f97\u6539\u8fdb\uff0c\u5176\u503c\u8fdc\u5c0f\u4e8e\u2013100dB\u3002<\/p>\n

\u8868 2. LT6018 \u63a8\u52a8 LTC2387-18 SNR \u548c THD \u7d50\u679c<\/p>\n

\"o4YBAFwkg-WADZppAACMGhw_lQM335.png\"<\/p>\n

\u7ed3\u679c<\/p>\n

\u5f53\u4ee3 SAR ADC \u517c\u987e\u4f4e\u566a\u97f3\u3001\u9ad8\u7ebf\u6027\u548c\u9ad8\u76f4\u6d41\u7535\u5931\u8861\u7cbe\u5bc6\u5ea6\u7279\u70b9\u3002\u8981\u5b9e\u73b0\u8fd9\u79cd\u89c4\u683c\u578b\u53f7\u89c4\u5b9a\uff0c\u5fc5\u987b\u9009\u7528\u4e00\u4e2a\u5177\u6709\u540c\u6837\u76f4\u6d41\u7535\u89c4\u683c\u578b\u53f7\u3001\u4f4e\u566a\u97f3\u53ca\u5145\u8db3\u7f51\u7edc\u5e26\u5bbd\u7684\u653e\u5927\u4eea\uff0c\u6bd4\u5982 LT6018\u3002\u9009\u7528\u4e2d\u7b49\u901f\u5ea6ADC\uff08\u6bd4\u5982 1Msps 20 \u4f4d LTC2378-20\uff09\u65f6\uff0c\u5c06 LT6018 \u4e0e\u7cbe\u786e\u914d\u5bf9\u7684 LT5400 \u7535\u963b\u5668\u76f8\u4e92\u914d\u5408\u5e94\u7528\u53ef\u4ee5\u9020\u6210\u5dee\u5206\u4fe1\u53f7\u952e\u5165\u6570\u636e\u4fe1\u53f7\uff0c\u4e14\u4e0d\u7528\u518d\u6267\u884c\u8fc7\u6ee4\u3002\u9009\u7528\u8d85\u8fc5\u901f SAR ADC\uff08\u6bd4\u5982 18 \u4f4d15Msps LTC2387-18\uff09\u65f6\uff0c\u6839\u636e\u63d0\u5347\u8fd0\u653e\u7535\u8def\u548c ADC \u503c\u4e2d\u95f4\u7684 RC \u8fc7\u6ee4\u4e92\u8054\u7f51\uff0c\u53ef\u4ee5\u5b8c\u6210\u4f18\u5f02\u7684\u566a\u97f3\u548c\u7ebf\u6027\u7279\u6027\u3002<\/p>\n

 <\/p>\n

\n

\u6d3e\u65d7\u7eb3\u7c73\u5b98\u7f51\uff1ahttps:\/\/paiqinano.com<\/p>\n

\u5927\u91cf\u7535\u5b50\u7eb3\u7c73\u9632\u62a4\u6d82\u5c42\u5242\u3001\u914d\u5957\u55b7\u9540\u8bbe\u5907\u3001OEM\u4ee3\u5de5\u670d\u52a1\u7b49\u8bf7\u5173\u5fc3\u201c\u6d3e\u65d7\u7eb3\u7c73\u201d\u5fae\u4fe1\u516c\u4f17\u53f7<\/p>\n

\u7eb3\u7c73\u6d82\u5c42\u5242\u7406\u5316\u6027\u80fd\u8be6\u7ec6\u53c2\u6570\u76f4\u63a5\u70b9\u51fb\uff1a\u7eb3\u7c73\u7535\u5b50\u9632\u62a4\u6d82\u5c42\u5242\u53c2\u6570<\/a><\/p>\n

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\"\"<\/p>\n

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