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OPA differential input protection and range

Intellectual 1135 points

Replies: 2

Views: 795

Usually, there is differential input protection inside an OPA, which will limit the differential input voltage amplitude.

OPA192 can sustain a 36V differential input range.

  1. What’s the differential input range of OPA170 and OPA171? Do they also have input protection diodes inside?
  2. OPA192 is kind of expensive, is there any other low cost OPA that can sustain a wide differential input range, say 10V?

 

Many thanks!

Bell

2 Replies

  • Bell,

    OPA192 does not have the back-to-back input protection diodes between the input terminals so may take the inputs to opposite rails (up to 40V total) - see below.

    However, since OPA171 does have those diodes, you may only pull the input terminals apart up to +/-0.5V - anything more requires limiting the current to less than 10mA or you will damage the input stage.

     

    Marek Lis, MGTS
    Sr Application Engineer
    Precision Analog - TI Tucson

  • Bell,

    If "OPA" can mean op-amps from other prefixes other than OPA series, then these are high voltage op amps with high VID tolerance (and low cost).

    TS321, LM358, LM324 family of devices.

    TL031, TL061, TL071, TL081 where 1 = {1,2,4}

    RC4558

    MC1558

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

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