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ucc3895(急)



请问根据公式VDEL=[0.75*(VCS-VADS)]+0.5,假如把ADS引脚和CS引脚连接在一起,那中括号里面的部分是0,那整个VDEL=0.5V,假如RDEL=10K的话,则延时时间为525NS,怎么会是资料上所说的无延迟时间呢?

  • 您好,请参考下面DATASHEET中ADS脚与CS脚的内部框图:

     

     

    a.  若ADS脚与CS脚的电压相同但不是短接时,您上面所提到的公式成立,Tdelay = 525nS;

    b. 若ADS脚与CS脚是直接短接时,CS脚内置的0.5V偏置会同时将ADS脚与CS脚的电压拉高至相同,此时内部运放正负端电压相同故输出为0, 此时VDEL会随之变为0而导至Tdelay=0。