According to the AD9650 register description, address 0x10 is Offset adjust in LSBs from +127 to −128
In that context, I assumed lsb means conversion lsb. But on the first article of my new AD9650 design, a change of 1 lsb of this register has a measurement change of 128 quanta. Is this correct, or could my device be damaged? I have only measured terminated-input so far, and won't have a suitable signal generator to test signal gain for a few more days.
Example: write 0 to R10 - noise input mean is -105q
write 1 to R10 - measurement mean is 23q
write 2 to R10 - measurement mean is 151q
I have double checked RBIAS resistor = 10K (in-circuit measure 9.88K). VREF is external at 1.95V