AD5683R VOUT problem

Hi,

Can you provide the schematic diagram of your circuit and the supplies used?

What's the output voltage upon power-up? It should be 0V.

Cheers,

Ivan

Yes, Vout is 0V after power-up till initial.

After initial Vout is 1.25V.

Hi,

Can you provide the exact steps as to how exactly you came up with 1.25V?

1) Supply 5V, Vout= 0V

what's next?

You may also isolate the problem by disconnecting R47 from the output.

Cheers,

Ivan

After power up, 

I just write to AD5683R 0x030000, then Vout is 1.25V.
Disconnecting R47, also same.

0x30 0000

What's the voltage of VREF pin?

If you set the output to 7FFF, what's the voltage at the output?

Please try resetting the device (through RESET bit of Control register) if the output goes back to 0V.

For additional information, please send the oscilloscope shot of the SPI lines ( SDI, /SYNC, SCLK) when you sent 0x30000

Cheers,

Ivan

Thank your Ivan,

I was wrong, SCK polarity is falling edge.

Best regards,

Yongin Lee

Thank your Ivan,

I was wrong, SCK polarity is falling edge.

Best regards,

Yongin Lee