AD5781 hardware and software setup

Question

Dear Friends: 
 I plan to use AD5781 for my project. I have three questions: 1) if I plan to set the LDAC permanently low, should I use a resistor between LDAC and GND? 2) if I do not plan to use CLR, can this pin be disconnected? 3) if I want the a predetermined Vout right after the chip goes to normal mode, I should load DAC register before the control register, am I right? 
 Thank you

isantos · Accepted Answer

Hi, 
 1) No need to use a pull-down resistor between LDAC and GND. Are you going to use a microcontroller to communicate with the DAC? May I know the configuration of the digital lines' output? is it push-pull or open-drain? 
 2) If you do not plan to use /CLR pin, I highly suggest to tie this pin to IOVCC pin. 
 3) Yes you are correct, a value must be programmed on the DAC register before changing the output to normal operating mode if you want a predetermined output value once it goes to normal mode. 
 Hope this helps! 
 Cheers, 
 Ivan)

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AD5781 hardware and software setup