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Connecting ADS805 to MCU

iAdrian
Prodigy 110 points

Other Parts Discussed in Thread: MSP430F5338, ADS805

I'm using the ADS805 with an MSP430F5338 and was wondering what is the correct way to obtain a valid sample.  Currently, I am using a pre-scaled version of SMCLK from the MCU as the clock input for the ADC (around 20kHz).  However, I haven't been able to read an accurate sample.  How do I know when the output of the ADC is valid? When should the MCU read the ports to which the ADC is connected?

Thanks

  • 0
    TI__Mastermind 29220 points

    Hi,

    The timing diagram on the bottom of page 4 of the ADS805 datasheet shows when the output sample is valid.  After the rising edge of the sample clock is seen at the clock input to the ADC, the output sample data will be valid after 12ns.   Since these older ADCs dont output a bit clock with the sample data you habe to use your own clock to latch in the data, and at this low sample rate the falling edge of your sample clock could be used to latch the sample data from the ADC.

    Regards,

    Richard P.