1746-NIO4V
1746-NIO4V另一個低端檢測應用
另一個示例如圖 3 所示。該示例具有較低的噪聲增益,但它使 用 3 mV失調、10-μV/°C失調漂移和 79 dB CMR的低精度四通道運算放大器。在 0 A至 3.6 A范圍內,要求達到±5 mA精度。若采用±0.5%檢測電阻,則要求的±0.14%精度便無法實現。若使用 100 mΩ電阻,則±5 mA電流可產生±500 μV壓降。不幸的是,運算放大器隨溫度變化的失調電壓要比測量值大十倍。哪怕VOS 調整為零,50°C的溫度變化就會耗盡全部誤差預算。若噪聲增益為 13,則VOS的任何變化都將擴大 13 倍。為了改善性能,應使用零漂移運算放大器(比如 AD8638、 ADA4051或 ADA4528)、薄膜電阻陣列以及精度更高的檢測電阻。
圖 3. 低端檢測,示例 2
1C31125G02
1C31129G03
1C31132G01
1C31161G02
1C31164G02
1C31166G01
1C31179G01
1C31179G02
1C31181G02
1C31189G01
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