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OPA2322, How is VID limitation?

Shinichi Inoue
Guru 19651 points
Other Parts Discussed in Thread: LMV654, OPA2322, OPA4322

Dear Specialists,

My customer is considering wide VID input  ope amp.

I introduced LMV654, but VID(+/-300mV) is not acceptable.

He wants VID spec is the same as VCM spec.

Generally, VID is limited by ESD diode between plus pin and minus pin. 

I think OPA2322 may be good.

Could you teach me is there ESD diode between +pin and -pin and how is the VID spec?  

Best regards,

Shinichi

  • 0
    TI__Guru 60570 points

    Shinichi,

    Most bipolar op amps as well as higher supply voltage (Vs>12V) CMOS amplifiers require back-to-back input protection diodes to prevent damage to the input transistors while a large differential voltage is applied between the input terminals.   Since OPA4322 is a low supply voltage op amp (Vs<5.5V), there is no back-to-back input protection diodes at its input front-end.  Therefore, it can tolerate the maximum input differential voltage equal to the max rated supply voltage of 6V.  However, if any of the input terminals voltage exceeds 0.5V beyond either supply, the input current must be limited to 10mA or less.  This is typically done by placing a current limiting resistor in series with input.  For more info, please read the forum post below:

    http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/p/265201/927351#927351

     

  • 0 in reply to Marek Lis
    Guru 19651 points

    Dear Marek

    Thank you for your reply.

    I have understood that OPA2322 has no protection diode between + and - input pins.  

    It is useful for the customer.

    I'll keep in mind that typically low power supply ope amps don't have protection diode between input pins.

    I appreciate your great help.

    Best regards,

    Shinichi