Python DRIVER AD5687R output voltage problem

Hi JBALL38 ,

One possibility is that the GAIN pin might be misconfigured. The other possibility is that the SPI command isn’t formatted correctly. The AD5687R requires a 24‑bit frame (4 command bits, 4 address bits, and a 12‑bit data field left-shifted by 4 bits). If the data isn’t properly shifted or if you’re sending only 16 bits, lower-code values can be misinterpreted. Also, if you’re using a command that requires an LDAC pulse, make sure it’s being applied correctly.

Could you share your complete system settings, schematic, or code snippet?

Br,

Den

Hello Dendalisay,  

thanks you for your first answer.

I complete my post by this light schematic

Gain is tie to GND=0V

Vref =2.5V out by the AD5687R

And for SPI frame I verify it by oscilloscope with a digital decoder it correspond to   , the command send seems correct in any case, but please could you confirm the mode SPI ? 

with the code 0x0010 (DB15:DB0)  correspond to 0x001 for 12 bit DAC and I have lower voltage output at 0,002V, it seems also correct ...

Other point, the readback don't respond, the MISO (SDO) stay at HiZ (pulled up by R =10Kohms) when I send  0x91 (DB23 : DB16) in command. but is not important for the moment I prefere update the Voutput with good value first.

Best regard.

Noboby for other answer ?