DAC8560: Consult for design questions

WU YISYUAN

Part Number: DAC8560

Hi,

My design as below:

      I want to control the MOS through DAC8560 to realize the current adjustment function.
      Reference design on similar specifications.
       I don't know if this design is feasible?

thanks.

over 6 years ago

0 Uttam Sahu over 6 years ago

TI__Genius 14220 points

Hi Wu,

Thank you for your query. I am looking into your post. I will get back by tomorrow.

Regards,

Uttam Sahu

Applications Engineer, Precision DAC

0 Uttam Sahu over 6 years ago in reply to Uttam Sahu

TI__Genius 14220 points

Hi Wu,

Apologies for the late response. The VFB node of the DAC is not directly connected to the inverting terminal of the internal amplifier. It is connected through two gain resistors. The datasheet shows a simplified block diagram. The VFB pin is mainly used for a force-sense connection and not for connecting to an external gain stage. If you want to design a programmable current source or sink, you can look at the following application notes:

http://www.ti.com/lit/an/slaa884/slaa884.pdf

http://www.ti.com/lit/an/slaa868/slaa868.pdf

http://www.ti.com/lit/an/slaa867/slaa867.pdf

http://www.ti.com/lit/an/sbaa335/sbaa335.pdf

http://www.ti.com/lit/an/sbaa345/sbaa345.pdf

Hope that answers your question.

Regards,

Uttam