ZHCSJE1C February 2019 – December 2023 TMUX1111 , TMUX1112 , TMUX1113
PRODUCTION DATA
請參考 PDF 數據表獲取器件具體的封裝圖。
The TMUX111x devices can be operated without any external components except for the supply decoupling capacitors. All inputs signals passing through the switch must fall within the recommend operating conditions of the TMUX111x including signal range and continuous current. For this design example, with a supply of 3.3V, the signals can range from 0V to 3.3V when the device is powered. The max continuous current can be 30mA.
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 TMUX111x have a typical On-leakage current of less than 10pA which would lead to an accuracy well within 1% of a full scale 10μA signal. The low ON and OFF capacitance of the TMUX111x 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 CON Multiplexers for more information on calculating the phase margin vs. percent overshoot.