9.2.2.2 Detailed Design Procedure

Photodiodes commonly have a current output that ranges from a few hundred picoamps to tens of microamps based on the amount of light being absorbed. The TMUX1511 has a typical On-leakage current of less than 10 pA which would lead to an accuracy well within 1% of a full scale 10 µA signal. The low ON and OFF capacitance of the TMUX1511 improves system stability by minimizing the total capacitance on the output of the amplifier. Lower capacitance leads to less overshoot and ringing in the system which can cause the amplifier circuit to go unstable if the phase margin is not at least 45°. Refer to Improve Stability Issues with Low C_ON Multiplexers for more information on calculating the phase margin vs. percent overshoot.