AD5313R spi programming problem

Question

I am testing a board that has a AD5313R DAC by bit banging the SPI signals. I have LDAC and Gain tied to ground. I am clocking the part at about 200 Hz (very low speed). My problem is that occasionally when I set a value the output will go to zero or the output will turn off. I can consistently program the DACB to 32 dec and then program it to 64 dec and the DACB output will turn off. If I send a command to turn DACB on it has the correct output voltage for value of 64 dec. 
 
 I have a logic analyzer on the SPI bus and it does not show any issues. Except when this happens the output voltages I program are correct. I have some similar issues when programming DACA but I have repeated the above sequence many times. 
 
 I am using command 3 (Write to and update DAC Channel n) to program the DACs.

EZAdministrator · Accepted Answer

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