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Original question:

ADS8353-Q1: ADS8353-Q1 SPI mode and timing

ADS8353-Q1: maximum acquisition time

Shubiao Wang
Intellectual 1490 points
Part Number: ADS8353-Q1

Hello there, 

about the acquisition time, the EC table says that the maximum acquisition time is tacq=33*tCLK-tconv= 33*50ns-730ns=920ns (when 20Mhz, dual SDO mode)

however, in figure 7-6 the tacq start at the end of tconv, ends at the falling edge of the second CS signal, it seems that the acquisition time depends on the CS period?

i am confused about this two description about tacq. 

please help me understand here.

BRs

Shubiao Wang

  • 0
    TI__Mastermind 22950 points

    HI Shubiao,

    The diagram just shows that you need to adjust the falling edge of CS to ensure that the maximum timing is met. Additionally, a CS period (Frame) is composed of tconv + tacq so keep this in mind as well while ensuring that the maximum acquisition time is met. I hope this makes sense. If not, please let me know and I can clarify further. 

    Regards,

    Aaron Estrada