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ADS7828: Help in verificatin of schematic

Shailendra Singh
Prodigy 30 points
Part Number: ADS7828

Hello Everyone

We are using ADS7828 in one of our sensing board (2 of them in a single board) as we have 16 analog channels. 

We have came up with a schemtic in which ADC0_A1 and ADC0_A0 are put in different states to provide two different 

I2C address. Before going to final routing and PCB manufacturing, i needed some help in verification of the schematic if 

there is any thing else which need to be added in order to remove the noise or this would work. 

  • 0
    TI__Expert 5485 points
    Hi Shailendra

    Schematic looks ok. Please see my comments

    1. I have one comment on reference pin connection. You have used ferrite bead in series with REFIN pin. Reference pin is required to provide peak current during conversion. I would not recommend use of inductive element between VDD and REFIN connection unless your ADC sampling speed is low.

    2. SDA/SCL pins will need pull up resistor to VDD. Resistor value between 1k to 10k is typically used for pull up resistor.

    3. You can increase address pin pull-up / pull down resistor values up to 10k to save some power.

    Thanks & Regards
    Abhijeet
  • 0 in reply to Abhijeet Godbole
    Prodigy 30 points

    Hi 

    Thanks for confirming it. 

    1. We are not doing fast sampling. The process at othe end change very slowly. Our sampling speed is one sample per 1 minute. 

    2. SDA/SCL is already pulled up. It was a part of same schematic in different page. 

    3. As this would be running on DC power, so power consumption won't be a issue. 

    Thanks