AD8552 spice model

Hi

I found AD 8552 spice model not working properly.Initially the file was not reading , then I found  there is two "dots' in before "subckt" declaration and I changed it and my spice program ( LT Spice) started reading. But I got a model without any labels, please check the attached image. I probably can do a trial and error to find the pins, but I am just wondering there is an updated model?

I have one more question. Is there any design or manufacturing change made to this particular amplifier recently (in last 5 years) because we are seeing some problems recently (in a nutshell a floating ground on output)? This question is a separate discussion but I am just wondering

  • NM,

      -- LTSpice has a generic op amp symbol.  Some how, you have told it to generate a symbol, so it only

    knows about inputs and outputs and power.

    --  The AD8552 product page has links for the PCNs for each line item.  2010 fab transfer and 2011

         halogen free epoxy adopted.

    --  "A floating ground on output"  makes no sense.  Can you supply a schematic?

    --  Why are you using a 13 year old part, when the AD8629 is the second generation, with better specs

       and lower price and a newer, better spice model?

    Harry


  • The downloaded version of the spice model wont work because of the small bug in the declaration. But usually LT spice generate models fairly decently. I have generated many symbols and never had a problem, for example AD8552 is one I am using and it works goood. Is there anyway to make it work? or can you suggest any spice software which is ideal for this model to work?

    Ignore the problem i mentioned regarding floating ground, I know I have not given much information. I was just wondering any revisions have been done.

    Question of 13 year old design which needs to be updated, its funding issue, we have almost progressed to another product to obsolete this product. But I agree with you to improve the design and infact our team has a new design also.

  • Hello,

    no need to go for try and error: the translation of the numbers to usual pin names is given in the cir-file, though the formatting is not ideal. I copy the correspondig part of the spice model with proper indention to show the mapping of names to numbers (1 is the noninverting input, 2 the inverting....):

                             * Node Assignments

                             *            noninverting input

                             *            |     inverting input

                             *            |     |     positive supply

                             *            |     |     |        negative supply

                             *            |     |     |        |      output

                             *            |     |     |        |      |

                             *            |     |     |        |      |

    ..SUBCKT AD8552        1    2    99    50    45

    You can easily change the labels in LTSpice symbol editor to more meaningfull text (a rightclick on the pin), you just have to keep the netlist order in the given sequence.

  • 0
    •  Analog Employees 
    on Aug 2, 2018 2:51 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