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ADS1299 strange spikes

Other Parts Discussed in Thread: ADS1299

Hi, I purchased an ADS1299 (no evaluation kit) and it's soldered to a breakout board. I have an Arduino talking to it and I am able to read and set registers properly. However, I'm getting a very strange spike for every reading I get. The bottom shows channel 1 (the top-most line) shorted and it still shows me the spikes:

And if I use a test signal, I see this:

This doesn't really look like noise, and I'm wondering if it's just due to some faulty wiring, or if I am actually setting a register improperly.

Thanks.