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PGA849型:Logic input protection for PGA849

sekine.kazuma
Prodigy 50 points
Part Number: PGA849


Tool/software:

PGA849は±15Vで駆動されており、ロジック部も15Vで駆動されていると思いますが、5Vのロジック入力を使用すると、15Vが逆流して前のICが破損する可能性はありますか?入力する前に、保護を追加するか、5Vロジック信号を15Vに昇圧する方が良いでしょうか?
  • 0
    Prodigy 50 points

    An English translation is provided.

    The PGA849 is driven by ±15V, and I believe the logic section is also driven by 15V. If I use a 5V logic input, is there a possibility that 15V will flow back and damage the previous IC? Would it be better to add protection or boost the 5V logic signal to 15V before inputting it?

  • +1 in reply to sekine.kazuma
    TI__Mastermind 22322 points

    Hello Sekine-san, 

    5V logic input is fine - no additional protection needed. 

    VIH Digital input logic high is VDGND + 1.8 to VS+ => High is between 1.8V to 15V. 

    Do you expect to have a large transients on V+? The abs max states the digital inputs (A2:A0) can be up to (VS+) + 0.5 => 15.5V. 

    All the best,
    Carolina