DAC7760: DAC7760

Hi, and welcome to the e2e forum.

Can you confirm where you are measuring 4V? are you measuring on pin 21 of the DAC7760 or pin 6 on the OPA680? Is there a difference in those voltages?

It would also be useful to verify the REFIN, REFOUT, AVDD, DVDD, and CLR-SEL voltages.

Thanks,

Paul

Thank you for answer. Every pin of DAC7760 except vout is in normal voltage, I 'm sure about that. Pin21 of DAC7760 and pin6 of OPA680 are same as 4V.

Have you written to any other register? Does this occur on all of the boards you have built, or just the one?

vout of dac7760 is 4V and i haven't written any register yet,and it's been 4V until I write 0x1000 to the control register‘s address 0x55. After wrote  0x1000 to the control register, vout changed to 0V which is normal.I tried this way that put a 10kΩ resistor between dac7760 vout and gnd，then everything is fine，4V changed to 0V immediately，and i can write every register normally and vout is correct.

Hi,

Does this occur on all the systems or just one that you have built? I suspect an assembly problem.

Thanks,

Paul