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Add OPA858, OPA859, and OPA855 high-speed opamps, WSON-8

Anders Wallin requested to merge github/fork/aewallin/OPA858 into master

http://www.ti.com/lit/ds/symlink/opa858.pdf and http://www.ti.com/lit/ds/symlink/opa855.pdf

The following might be discussed:

  • The ~PD is now pointing up, but I noticed some other op-amp symbols have a ~DIS pin and it is pointing down. I think having it close to V+ (where it is connected, for normal operation) makes sense.
  • The datasheet describes the FB-pin as Input, so I have made it Input-type
  • The PAD pin is stacked with V- (datasheet suggests V- is the only way to connect PAD)
  • parts are simply named OPA858 and OPA855, since they apparently come only in one package. There are full names at the back of the datasheets, such as OPA855IDSGR and OPA858IDSGT which would be an alternative.

OPA858

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