Hi,
You are right, I gave the wrong frame for the SPI input. One thing I missed is the +5VD to supply for the chip 7716. However, when I applied the same input like you, the output still keep 0V (although I tried many other values for data)
I think now my SPI input is correct thank to your information. The board seemly does not work with any input.
I captured some pictures and give the marks of what I have supplied to the DAC board, Could you please take a look, maybe I have missed anything:
1) The input pins (J2A) and switch S1:
2) The supply voltages:
3) The output and Ref voltage:
PS: I have some doubt that:
1) How can we know the shift register get the sequence of pulse correctly??? How can we debug this issue???
2) When I give the supply to the input SDI, I observed the SDO pin on oscilloscope, the pulse is similar but lag 1 or 2 bits (means SDI: 0000 0100 0111 1111 1111 0000 ->> SDO: 0000 0010 0011 1111 1111 1000)? Is it normal???
3) In page 22 of datasheet, the Power-Supply Sequencing; is it important for a simple conversion???
4) Do we need to set up anything about Zero or Gain calibration???
Thank in advanced!!!!
Duy