描述
ΔΣADC非常適合于測(cè)量電池充電等應(yīng)用中的微細(xì)變化，但由于實(shí)際應(yīng)用當(dāng)中的許多傳感器都具有很大的阻抗，因此經(jīng)常會(huì)極大限制ADC的使用，或者需要增設(shè)前端信號(hào)調(diào)理電路。即使是很小的輸入采樣電流也會(huì)在高阻抗傳感器上引起誤差。LTC2498通過(guò)采用EasyD
rive技術(shù)(一種獨(dú)特的模擬前端架構(gòu))來(lái)平衡輸入電流，從而能夠解決這個(gè)問(wèn)題。
EasyDrive架構(gòu)簡(jiǎn)化了ΔΣADC的驅(qū)動(dòng)要求。該解決方案基于一種純無(wú)源差分輸入電流抵消算法，這種算法實(shí)現(xiàn)了軌至軌輸入，而沒(méi)有因?yàn)槭褂闷瑑?nèi)緩沖放大器所導(dǎo)致的功率要求增加以及所導(dǎo)致的誤差。EasyDrive技術(shù)使得LTC2498能夠與高阻抗傳感器、低通濾波器和輸入旁路電容器直接相連，而不會(huì)使直流性能產(chǎn)生實(shí)質(zhì)性的劣化。圖2詳細(xì)描繪了LTC2480單通道EasyDriveADC的一個(gè)實(shí)例。
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