ehsannk,
Although Multisim does have several mixed signal ICs, something specialized such as this MT8870D IC will likely be difficult to simulate in its entirety.
You do have a couple of options - based on the level of modeling needed - here are some ideas:
1. Look at the functional diagram of the chip on the datasheet - can a portion of the output be modeled with a waveform (LabVIEW .lvm or SPICE piece wise linear (PWL)?)
2. If you need to model both the inputs / outputs in unison, a more detailed functional model may need to be developed (can this be developed as a set of logic gates, etc...) If so you may be able to create a top level Multisim circuit and then embed this into a Hierarchical block to give you the appropriate functionality.
3. Our LabVIEW Instrument functionality has a inout instrument capability (as of Multisim v10.1) allowing you to generate a function in LabVIEW and generate a response. The model will likely not be able to be time accurate in terms of a strict SPICE model timing (voltage/current input-output accuracy at each timestep of the SPICE solver), but it may allow you to implement some level of functionality that would be more difficult to implement in SPICE.
4. If you really need to do a SPICE model of the entire chip (macro model / behavioral model / IC level model), you can pay (likely $$$) to have a model developed - there are companies who can do substantial (and quality) modeling as needed, but typically this will be a costly effort as it can takes days to weeks of engineering time to develop. If you need this level of modeling (some companies do need this level of modeling to reduce the risk of the overall project), please contact me directly as I have several recommendations on companies who can do this sort of fee based SPICE macro/behavioral modeling.
Regards,
Patrick Noonan
Business Development Manager
National Instruments - Electronics Workbench Group
patrick.noonan@ni.com
