TI公司的ISO72x係列數字隔離器採用電容耦合技術。電容耦合解決方案使用了經過驗證的低成本制造工藝，能夠提供固有的抗磁場幹擾特性。ISO72x使用“AC”與“DC”兩種通道進行通信，如圖6所示。“AC”通道不經過編碼，而是經單端至差分轉換後直接通過隔離層傳輸數據。差分信號傳輸的優點是可抑制接收機的共模噪聲。共模抑制與耦合介質（對噪聲呈現高阻抗，對高頻數據呈現低阻抗）共同實現了瞬態抗幹擾功能。“DC”通道將輸入數據轉換成脈寬調制（PWM）格式，並使用差分方式通過隔離層傳輸數據。PWM與隔離層接收側的脈寬解調器（PWD）可確保穩態條件（1或0的長字符串）下能夠正確通信。此外，“DC”通道還可提供自動防護功能。自動防護指的是在出現輸入故障的情況下對輸出狀態的判斷。ISO72x係列器件使用載波檢測功能來確定輸入結構的電源是否處於“開啟”以及該結構是否正在運行。如果該載波檢測器在4ms內未檢測到脈衝，則會將輸出設置為邏輯高電平。
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