Ro端子のアナログ振幅 (レーザビームが通過したとき発生する電圧変化)電圧は、Vro＝電流ゲイン × 受光感度 × 外付けゲイン抵抗で表されます。Vroが2～3 Vになるように外付けゲイン抵抗を選定します (抵抗値は1 kΩ～10 kΩの範囲で選定)。4、6、20倍の電流ゲインのものを用意しており、レーザビームパワーに合わせて選択が可能です。なお、2素子タイプの場合、Ro1、Ro2に接続する抵抗は同じ値のものを使用してください。
1素子タイプの場合は左右どちらの方向でも構いませんが、2素子タイプの場合は、ch 1→ch 2の方向にスキャンして使用します。
2素子タイプのメリットである、パワー変動・温度変動に対してタイミング変動の少ない出力を得るには、Ro1端子、Ro2 端子の電圧波形が、2素子フォトダイオードの中央でクロスするような形状 (X状)になることが必要になります。計算上では、出力が得られるアナログ振幅は1.5～8 V です。ここでアナログ振幅の値を大きくしすぎると、パッケージ内部の迷光により誤動作する可能性があります (迷光は、ΔVRoの6%程度発生します)。上限は3 Vより多少大きくても (6 V程度まで)問題はありませんが、過剰にアナログ振幅を大きくすると安定した出力を得にくいため3 Vまでを推奨しています。
1.5 Vまでは特に問題は起きませんが、1.5 V未満になった場合、ゲイン抵抗端子のクロス波形が得られないため、パワー変動・温度変動に対してタイミング変動の少ない出力が得られなくなります。
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