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ADS8588HIPM GND and timing

ThomasZhong
Prodigy 30 points

Hello team 

1. I need double conform with PIN 26 is connect GND or AGND?

https://e2echina.ti.com/question_answer/analog/data_converters/f/58/t/129734 

2. I am confuse the Timing of the ReadData as describe in the datasheet.

  • 0
    TI__Mastermind 24940 points

    Hello,

    1. You can connect this pin either grounds. If you have split grounds, then connect it to analog ground. Also rememeber that if you are using split grounds, the analog and digital ground planes must be at the same potential joined together in close proximity to the device.

    2.  Is the device being used in parallel or serial?  Overall, you need to hold down CS and send SCLK (or RD) pulses for each bit to be read.  I would suggest reading page 41 and on of the datasheet to get a better understanding of the features available.

  • 0 in reply to Cynthia
    Prodigy 30 points

    Hello Cynthia:
    Thank you for you replay.

    1.I had split two grounds use the Power Isolation Chip, so the AGND and GND is not connect together.Is had some issues in this circuit?
    2.I am used the parallel interface read the data.According to the datasheet in the page 14 of the timing figures.Every time get the result should first reset the device? Second pull down CONVSTA and CONVSTB the device is start convert,third waiting the BUSY PIN pull down,fourth pull down CS,RD PIN in rising edge read the data out.

  • 0 in reply to ThomasZhong
    TI__Mastermind 24940 points

    1.  Be sure to connect all the device grounds to AGND.

    There are a lot of good reference designs that address isolation if you would like to read more about it, I did a quick search through our TI reference lest, and came up with 44 results, one of them TIDA01037 is a good one to look at

    2. No, you do not need to reset the device each time you read results.

    Pulling down CONSTA and CONVSTB begins the conversion, you have the option of having these two signals seperate or tying the two together.

    Correct, the Busy pin is an active high, thus waiting until BUSY signal is low, indicating that the device is no longer in an ongoing conversion.

    Note that you also have an option of controlling CS and RD as two seperate signals, or connecting them together as well. Once you pull down CS the parallel bus is activated and the data is clocked out on the falling edge of RD.

    Regards

    Cynthia