/etc... Amplifiers & Other Linear

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PGA280
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Related Posts

  • Forum Post: PGA280 Offset

    pasinetti
    Hello, I'm using a PGA280 and I have some trouble finding the offset for all available gain... In the datasheet we can find th offset for a gain of 1V/V and 128V/V but nothing else?! And the offset seams to be very different from one gain to another! Thank you for your answers
    on Oct 6, 2010

  • Forum Post: Re: Fully Differential Fixed Gain Amplifier?

    Frank Haupt
    Hello Jay, there is indeed a differential-in and differetial-out instrumentation amplifier with fixed gain options available. Actually the gain is not exactly fixed, it is rather programmable. Please have a look at the PGA280. This in-amp has a +/-15V capabale differential front-end as well as a fully...
    on Oct 13, 2010

  • Forum Post: Re: PGA280 input bias current when saturated

    Viola Schaffer
    Hi Mike, Several cases of input overload are possible. It sounds like that in your case the inputs remain within the high voltage supply range and within the valid common mode input range but your input signal magnitude is exceeding the valid range for your gain setting. In this case the current through...
    on Mar 11, 2011

  • Forum Post: Re: PGA280 input bias current when saturated

    Viola Schaffer
    Hi Mike, Thanks for the clarification on the input pairs and the additional information. Your input is being pulled to the positive supply due to the architecture of the clamps at the inputs of A1 and A2. When the clamp turns on it overrides your weak input common mode setting and pulls the input...
    on Mar 11, 2011

  • Forum Post: Re: PGA280 input bias current when saturated

    Viola Schaffer
    Hi Mike, Yes, you are right. The PDS does not provide enough information to predict the clamping behavior. Another possible solution to your overload problem would be to switch the current buffers (PDS Page 20-22) into the signal path for the PGAs that are not the sampling. There are several options...
    on Mar 14, 2011

  • Forum Post: Re: PGA280 input bias current when saturated

    Viola Schaffer
    Hi Mike, Yes, the buffer can be switched in as long as desired using the GPIO4 pin. However, the GPIO4 pin will not act as an output any more when the special pin function is selected. Would using another GPIO pin to drive GPIO4 be a suitable option? Of course all of this is communication intensive...
    on Mar 14, 2011

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