S9705は、電流－周波数変換器とフォトダイオードを組み合わせたCMOSフォトICです。入射光強度に比例した発振周波数の矩形波 (デューティ比 50 %)を出力します。CMOSレベル出力のため、マイコンなどのロジック回路入力に直接接続できます。広いダイナミックレンジをもち、カウンタなどと組み合わせることにより、容易に光強度を測定することができます。
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