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ADS1278: Dout/CLK signal requiremenmt?

Mani Kandan Devarasu
Prodigy 140 points
Part Number: ADS1278

Hello,

In my design i am reading wrong data with general termination resistors added in series (49.9 ohms),but when i try adding 20pF across Dout line wrt to gnd the data seems to be fine (a passive low pass filter).

adding an RC filter to CLK or DOUT line will it impact the performance of the ADS1278 device?



Thanks

Mani

  • 0
    TI__Guru 66466 points

    Hello Mani,

    Thank you for your post.

    Adding an R-C filter to any of your digital communication lines will not impact the performance of the ADC itself. There are a couple reasons why this may be help with data integrity issues.

    First, low-pass filters on digital lines can be helpful in removing excessive overshoot/ringing or other noise, which can corrupt the data latched by the MCU.

    Second, adding an R-C delay might resolve some marginal timing issues. I would not rely on inserting R-C filters to fix these types of issues. Double-check all communication timing with the data sheet requirements and be sure to add some extra margin. This will ensure data is clocked and latched correctly.

    Best regards,