I have been working on AD5065. But I haven't gotten it worked for 2 days. Something is weird.
I attached my schematic. First of all, I have checked all the power and data line connectivity. It looks that everything is ok..
I also attached the Spi communication screenshots. As much as I understand from the datasheet, I put the data on the rising edge of the Sclk and data will be valid for DAC on the falling edge of the Sclk. I also paid attention on the timings, especially the timing for the last falling edge of Slck to rising edge of Sync which is 5 ns in my case. I set Sclk period is 25MHz. I also set Ldac to "0", CLR and PDL pins to "1" as a constant value in software. Because Ldac=0, the outputs should be automatically updated when I set the input register.
For example, I set the input register to generate 2V
for DAC A : "0000 0000 0000 1100 1100 1100 1101 0000"
for DAC B : "0000 0000 0011 1100 1100 1100 1101 0000"
But there is no response. Both channels always have zero volts. I thought there might be a wake-up command. I found power-up command and I applied it at the beginning which is
"0000 0100 0000 0000 0000 0000 0000 1111"
But the outputs still shows zero volt. Am I doing something wrong? Is there any initialization process to get this DAC running?
Any advise would be helpful. Thank you.