• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 47 subscribers
  • Views 444 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

Compiler/DAC81416: Software Compiling and Isolated Use

DAC81416: Functionality of device

Nicholas Tomasello
Intellectual 420 points

Part Number: DAC81416
Other Parts Discussed in Thread: LMP92066, AMC7834

Hello, 

I have been reading more into this DAC81416 chip and have a question about its functionality, mainly, if there is any ability for it to take in a feedback signal? I understand that it has applications for modulation control but do not see anywhere that it can have some sort of feedback mechanism. Would that mean a processor would need to communicate according to a feedback signal or am I missing something? 

Best, 

Nick

  • 0
    TI__Genius 14220 points

    Hi Nicholas,

    Thank you for your query. The DAC81416 doesn't have a feedback input pin. This device is primarily targeted for Mach-Zehnder modulator biasing using the toggle input signals. It can serve any other high-voltage / high-current catalog applications as well. It needs continuous input from a processor to close a feedback loop in control applications.

    Hope that answers your question.

    Regards,

    Uttam Sahu

    Applications Engineer, Precision DAC

  • 0 in reply to Uttam Sahu
    Intellectual 420 points

    Yes, thank you Uttam! The DAC81416 indicates that it can be used for ratio control of mach zhender modulators. I guess this means you would need to interface that control with a separate processor. Do you know if TI has any other products that kind of act as an all-in-one? 16-bit internal reference DAC with feedback control. Maybe a good microprocessor or something besides the MSP430 product line? 

    Thanks, 

    Nick

  • 0 in reply to Nicholas Tomasello
    TI__Genius 14220 points

    Hi Nick,

    We have a family of analog monitoring and control (AMC) devices that might help you with this application. I am copying my colleague Paul to help you with this. Could you please provide some more details of the requirement so that we can suggest the right part?

    Regards,

    Uttam

  • 0 in reply to Uttam Sahu
    TI__Guru 56043 points

    Hi Nick,

    We have a few specialized devices that might be able to help with this.  These devices are generally designed for a specific application, so they may not be a perfect fit.

    LMP92066 - This device can do temperature compensation. The device can store a look-up table in non-volatile memory with DAC values for each temperature, then it updates the DAC output based on the measured temperature.

    AMC7834 - This device will update its DAC value based on a measured current value.  The device features 4 DAC outputs and 4 current shunt monitor inputs (as well as many other features).  This compensation can operate in a 'closed-loop' mode.

    If you would like to email me (frost@ti.com) with details of your application I might be able to suggest another device.  Would a generic device that features some DAC outputs and ADC input with an integrated PID controller be interesting?

    Thanks,
    Paul