AD5643R-5 cannot output voltage

Question

I tied /LADC pin to GND, and /CLR pin to VDD on hardware connection. 
 I used an FPGA to sent config signals to AD5643. 
 First I sent 00_111_000_0000_0000_0000_0001 to use the internal reference, I can see a 2.5V output on the REFOUT pin. 
 Then I sent 00_011_111_1111_1111_1111_1111 to config DAC output ,but I can't see output on the VOUTA and VOUTB pins, they are still 0V. 
 How should I do to get the right output? Should config more registers?

iandal · Accepted Answer

Hi, 
 Sorry, the last bits for the power up should be set to 0 and not 1. Let me know if this works. 
 What is your VDD? Is there load connected to the outputs? Is your fpga timing compliant with figure 2 on the datasheet? the data should be setup on the rising edge and is sampled by the devicve at the fallingedge.)

iandal · Answer

Hi, 
 Have you tried sending a command to the power down/up register? (100) I don't have a unit with me at the moment so I can't confirm the power on state of this register. To power up the dacs set A or B to 1 XX_100_XXX_XXXX_XXXX_XX00_XXBA