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OPA4197: Compare to LT1359

Roy Chou1
Genius 14975 points
Part Number: OPA4197
Other Parts Discussed in Thread: OPA828

Hi team,

Could you let me know if OPA4197 could replace LT1359 or any other suggestion? My customer will use for unity gain(1 V/V) to enhance drive capability and they care about the OPA power consumption. 

And customer said that they don't need high drive capability part for their design. But as I know, Iout from OPA is judged by load. Is it right? So if we would like to choose the lower power consumption device, which spec should I concern?

Regards,

Roy

  • 0
    TI__Guru* 93105 points

    Hello Roy,

    When I compare the datasheets for the OPA4197 and LT1359 I do find some spec differences, but there is a high probability that the OPA4197 would drop into the LT1359 application and use about one-third the current in it. The OPA4197 is definitely a more precision performance, lower operating current op amp than the LT1359, but the LT1359 is targeted for wider bandwidth and very high slew rate which often requires higher operating current. So they are slated for different strengths that can be utilized by a particular application.

    There is a high probability that the OPA4197 will perform well in the LT1359 circuit and operate at about one-third the current of the LT1359 providing the very fast slew rate of the LT1359 is not crucial to the application. The OPA4197 quiescent is typically 1 mA per op amp section, while the LT1359 typical quiescent is listed as 3 mA per op amp section. 

    You stated "And customer said that they don't need high drive capability part for their design. But as I know, Iout from OPA is judged by load. Is it right?" Both the OPA4197 and LT1359 have output drive current capabilities approaching +/-50 mA. You have indicated that the customer doesn't require high output current drive capability so both should suffice. The maximum op amp output current (IOUT) required is the peak output voltage (Vo) divided by the load resistance (RL).

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Thomas Kuehl
    Guru 48395 points

    Hey Roy, the LT1359 is one of those high transconductance input VFA designs - they act kind of like current feedback for slew rate but are a VFA device. That comes with higher input noise but will give much higher LSBW than the OPA4197. LT did quite a number of these, TI NSM and BB less so. 

    There are a few higher voltage single like this device but I don't think any quads.

  • 0 in reply to Michael Steffes
    Guru 48395 points

    I did go into my parametric data base for 36V higher slew rate devices, that is here - couple of singles couple of duals, no quads. That OPA828 looks interesting, no quad I am guessing, 

  • 0 in reply to Michael Steffes
    TI__Genius 14975 points

    Hi All,

    Thank you for your comments.

    i think OPA4197 may be a good solution to replace LT part.

    Roy