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HMC1131 EVB seems to be different from datasheet

Dear Sir/Madam,

I've purchased HMC1131's EVB recently and the PN# is EV1HMC1131LC4.

After I received this EVB, I found that it seems be different from the EVB on HMC1131 datasheet.

The PN# of HMC1131 in datasheet, it's 600-00145-00-1.

But the EVB we received whose PN# on board is 600-01568-00-1, it seems these are tow the different boards.

Is my understand correct? And is possible to get related document (circuit, user guide) for 600-01568-00-1?

Any suggestion or opinion is highly appreciated!

B.R.

Henry