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AD5755 fastest synchronous DAC channel update using LDAC

Category: Software
Product Number: AD5755

Currently I'm running the AD5755 with nLDAC constantly tied to ground that leads to a single DAC channel update on rising edge of nSYNC with a minimum delay of 5 microseconds between two SPI transfers for DAC channel update (data sheet page 9, t19, digital slew rate control disabled).

Is it possible to use closer/faster SPI transfers (delay smaller than 5 microseconds) when using/toggling nLDAC for synchronous DAC channel update?



corrected typo
[edited by: BGaus at 6:52 AM (GMT -4) on 13 Jun 2022]
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  • Hi, 

    Apologies for the late response. I suppose that still counts as a DAC update write so you have to follow the 5us specification. And, I'd like to note that if you plan on using /LDAC toggling, a t9 of 20us min is also needed prior to asserting LDAC signal. If you plan to synchronously update all four channels, then the t9 spec actually just the same time as four instances of 5us t6 if you choose to asynchronously update them. 

    Regards,

    Ian

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