The AD9106 has internal resistors (RSET) to adjust the reference current for each of the four DAC’s.

The block diagram shows 16kOhm adjustable resistors connected internally to FSADJ1/2/3/4

And the FSADJx registers (0x09, 0x0A, 0x0B, 0x0C) show that they are 5 bit value.

What is the value, range, and step size for those internal resistors.

Hi -

At Reset each of the DACx_RSET values is set to 0x0A. 0x0A programs xRSET as 8kohms.

The resolution of DACx_RSET variables is 800ohms. The maximum value of DACx_RSET is 16kohms.

IOUTFS = 32*VREFIO/RSET (from equations 3 and 4 in the data sheet) With a nominal REFIO of 1.0V 8kohms produces an IOUTFS of 4ma.

Thanks