Added LTC1992 differential amplifier
This merge request adds the LTC1992 differential amplifier. The LTC1992-xMS8 is variable gain. The LTC1992-10-MS8, for example, has a fixed gain of 10. Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/1992fb.pdf
Note that the symbol has been copied from the THS4551xRGT, which violates S3.1 and S3.2. However I didn't want to change the general style. Symbol screenshot:
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Remove the instructional content of this template -
Provide a URL to a datasheet for the symbol(s) you are contributing -
An example screenshot image is very helpful -
Ensure that the associated footprints match the official footprint library - A new fitting footprint must be submitted if the library does not yet contain one.
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If there are matching footprint PRs, provide link(s) as appropriate -
Check the output of the automated check scripts - fix any errors as required -
Give a reason behind any intentional library convention rule violation.