DAC8830: dac8830 supply

Vahid,

The DAC8830 and ADS8865 input supply ranges do share some overlap so it is acceptable for them to be operating from the same power supply. Of course some considerations should be made regarding layout and selection of the power supply itself in addition to typical utilization of decoupling capacitors.

You will find there is a bit of a divided opinion concerning layout best practices for mixed-signal design concerning split planes versus solid planes. In the end regardless of this piece of the approach the key is to consider the physics of return currents in the physical layout and mitigating the number of instances where any two devices interact with one another. With 16-bits of resolution in both the ADC and DAC you're pretty close to the commonly proposed border of where this level of care is necessary or not in order to achieve the desired performance level. In the end the necessity of this consideration comes down to your DC accuracy goals and sampling rate (along with digital interface speeds) to decide.

Concerning whether the two devices make for a good pair, it's difficult to assess without understanding exactly what the application is and how the two parts would be interacting in that application.

Hi  Sir

thank you  for you help

if I want  to change the dac8830 output voltage  to current  (for  transmit signal about  50 miter  through  cable ) whats is your recommendation?

the analog signal  BW  is  300-4000 HZ 

can I  use   AD694   after  DAC  to  change it  to current?

Is   there  any DAC  whit current  output   that  i use it  instead of  dac8830+ converter
My prefer  design  is using  dac  whit current output  but   I am not sure about it

 Hi Kevin Duke

thank you
  for your reply

but  is not  these device  settling time  insufficient ? 

10 us    meanies that   my  update rate would be up to 100 ksps

how about  if i want to  have  better quality

thank  you