Die structure in OpAmps

I would like to know what is the difference in the die structures of the following Op Amps

  • AD8620
  • AD8512
  • AD8513
  • OPA4227

The main reason to know more about the die structures is to know how much the IC's will dissipate power supply current/energy. I came across some material which tells that even though the IC's and their working performance are same, the power supply current for each will be dependent on the die structure of the particular IC.

  • 0
    •  Analog Employees 
    on Dec 9, 2012 7:35 PM

    Hi,

    Thank you for your interest in ADI amplifiers. You are correct to point out that the die structures have something to do with how the IC consumes current or energy. The good news is that we don't really have to know these complex structures since the datasheet already tells us how much current the part needs to operate. This current is stated as the Supply Current (usually per amplifier), under the Power Supply section of the Electrical Characteristics table.

    Also, if you are interested in calculating the maximum power the part will dissipate, here is a good article which discusses just that.

    http://www.analog.com/static/imported-files/tech_articles/MS-2251.pdf

    I hope I have given you something useful to you.

    Regards,

    Neil

  • 0
    •  Analog Employees 
    on Dec 9, 2012 11:07 PM

    Hi Abhijit Pethkar,

    Thank you for clarifying that. I understand that the products you mentioned seem to function similarly. After all, these amps are generally classified together under precision category, especially that AD8512 and AD8513 belong to the same family and differ only in the number of amplifiers per package. I believe the datasheet provides plenty of information that are useful in comparing these products. Crosstalk, or channel separation, can be found on Figure 42 for AD8620, while Figure 57 for AD8512/13. Other parameters that the products differ include Bandwidth, Slew Rate, Supply Current, Operating Temp Range, Input Bias Current,  Pk-pk Voltage Noise. Also, for more information on singles, duals and quads, you might want to read on these articles:

    http://www.eetimes.com/design/analog-design/4210663/Op-amps--to-dual-or-not-to-dual---Part-1-of-2-

    http://www.eetimes.com/design/analog-design/4210881/Op-amps--to-dual-or-not-to-dual---Part-2-of-2-

    Regarding to the information on the internal structures, I will have to ask for permission first before posting it here.

    And by the way, OPA4227 is not an ADI part and therefore I cannot give technical support on this product.

    Best regards,

    Neil

  • Dear Neil,

    I want to know that regardless of how much current these IC will dissipate power, the die structure will also decide the crosstalk of the OpAmps present inside the ICs.

    You are right that I do not need to understand the die structure of the ICs for power calculation, but I am doing a comparison of the ICs based on the power dissipation, crosstalk or any other parameters which will differentiate between the ICs. As after simulation I found that more or less the above ICs are giving same results. This is leading me to think that there has to be some other parameter which differentiates between these ICs (Which probably I do not know).

    This will unable us to complete our analysis part of the design. Hope you will give us some information.

    Also I am not interested in any information from you which will endanger Analog Device's patents or the copyrights.

    Regards

    Abhijit Pethkar

  • 0
    •  Analog Employees 
    on Aug 2, 2018 4:43 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin