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ISSUE with STHVDAC-253M High Voltage Dac (25v)

Question asked by wadsworth.peter on Sep 30, 2016
I have an issue with a STHVDAC-253M which provides 0 to 25V dc to tune a cap for use with an antenna.

Currently I can only get a steady 0v or 25V out of the  device, the DAC has a 7 bit register and anything above 0 gives max output(25v)
Checked the data being sent and everything looks correct, and have also read back correctly the register and the manufacturers ID.

Any ideas?