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regarding ADC128S052, ADC128S102 and ADC78H90

Gordon Su
Intellectual 300 points


Hi,

the above three converters having the same pinout and package. if my design only requires 500ksps i guess i can use any of them, am i right? is there anything else i need to pay attention to?

i am new to ADCs. i have some question when i am reading the below datasheet Figure 1. the input selection by add[2:0] is fully latched by the converter at clock edge 6. how could the converter finish tracking earlier at clock edge 4? how does it know which input to track? i guess the tracking and conversion is based on the previous read cycle, which is not shown in the figure. is my understanding correct?

http://www.ti.com/lit/ds/symlink/adc78h90.pdf

Best regards

Gordon

  • 0
    TI__Expert 3355 points

    Hi Gordon,

    You are right, at the conversion rates you are interested all of the above devices are interchangeable.

    As far as the input selection is concerned, you are right again: the address that you provide in the current frame (frame being the period during which the CS\ is low) will set the input mux in the following frame. This is not very well captured in the data sheet, and I am sorry for that. But there is a brief mention of that at the top left of page 13 in the data sheet.

    https://e2e.ti.com/support/data_converters/precision_data_converters/int-precision_data_converters/f/75/t/160904.aspx

    Hope this helps.... and if not, please do not hesitate to contact us again on this forum.

    Sincerely,

    tom

  • 0 in reply to Tom Domanski24
    Intellectual 300 points

    Hi Tom,

    thank you for your quick response. it is very helpful.

    Best regards

    Gordon