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Programming LTC2636

I tried to use LTC2636, so far no luck

First I output 0x7000 via SSI, to set it up to use external reference (I can confirm 0x7000 on CS, SCK and SDI with logic analyzer)

Then I output 0x0080 via SSI, to write 0x80 to register 0

finally I output 0x0100, to update the dac, but i got nothing on VoutA

Did I miss something? Thanks for your time

Below the schematic

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