Thank you for your post.
The ADC40 has a maximum sampling rate of 20kS/sec, a bandwidth of 10KHz. The 2202 has a sampling rate of 20MS/sec, a bandwitdh of 2MHz.
The 2202 is far better as your bit rate is approaching your maximum sampling rate. You will get better, longer samples with the 2202 as the ADC40 has no memory or clock onboard.
Michael - Tech Support
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