The abnormal -10V output has been disappeared by adding two pull-up resistors on /CS and R//W lines as attached.
I think that these two lines should be "H" status or be connected to the VDD of AD5440 when start up.
- Am I correct?
Both DAC10BX and DAC10BX/833 are obsolete.
AD5433 (single) and AD5440 (dual) are 10-bit MDACs that could be offered as replacements, not pin for pin but with similar functionality.
If you are using or plan to use the AD5415 12-bit DAC chip in a daisy-chain configuration, you need to read page 20 of the marked up data sheet attached. If you are using the SDO output of even a single AD5415, then you also need to see the erratum marked…