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ADS8598H: Achievable data rate of ADS8598H with serial readout

Simon Richner
Prodigy 30 points
Part Number: ADS8598H

Hi,

I have been looking at the ADS8598H ADC with great interest.

According to the datasheet it has 8 simultaneously sampling 18bit ADCs at 500kSps. It has two serial data outputs (DOUTA and DOUTB) with a minimal sclk of 50ns.

When I calculate the time taken to read out all 8 channels I get:  8 channels x 18bit x 50ns clock / 2 data outputs =  3.6us = 278kSps! (not considering conversion time nor any other timings)

To me it looks like a typo in the datasheet, as the ADS8598S (with 200kSps) has exactly the same serial readout specifications (sclk = 50ns min.).

OR

The other explanation would be, that the maximal sampling rate of 500kSps can only be achieved by using the parallel read mode (in which case this should be mentioned in the datasheet).

Could someone from TI please clear this up for me.

Thanks,

Simon

  • 0
    TI__Mastermind 45285 points

    Hello Simon,

    You are right, 500ksps sampling rate is for parallel interface, but when using both serial data outputs (DOUTA and DOUTB) :  total 18x4=72 SCLKs, when using only one serial  data output (DOUTA or DOUTB) :  total 18x8=144 SCLKs.

    I will talk to our team to make it clear when have a chance to update datasheet next time. Thank you.

    Best regards

    Dale