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DAC81416: Differential Mode

Nathan D'Arcy
Prodigy 50 points
Part Number: DAC81416


Tool/software:

Hi,

I was wondering if I could request some more details on the topology or even a block diagram of how differential mode works? I am wondering if a single DAC output is used to generate the differential outputs via manipulation of the buffer stage etc., or if each output in a pair is generated by its respective single-ended DAC separately. 

I am basically trying to understand if one should expect all max errors such as gain offset, INL etc. to be doubled when using differential mode. 

Many thanks for your help. 

  • 0
    TI__Mastermind 42273 points

    Hi Nathan, 

    Sanjay will put together a better explanation or diagram and get back to you soon. Likely later this week after New Years. 

    Best,

    Katlynne Jones

  • +1 in reply to Katlynne Jones
    TI__Expert 5140 points

    Hi Nathan,

    This (as shown in the image below) is normal mode mode and differential mode of operation and load connection. How the load is connected is different in both cases. Each output in a pair is generated by its respective single-ended DAC simultaneously, but both in opposite direction (as shown in the plot).  



    Differential mode output and this functional helps to increase the voltage range across a load by 2x. This mode helps to increase the DAC VOUT voltage span up to 80V. The device has VCM adjustment feature as well to eliminate any kind of common mode error.
     
    Thanks,
    Sanjay