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ADS1296R WCT Chopping

Alex Looi
Prodigy 135 points
Other Parts Discussed in Thread: ADS1296R

Hi,

I would like to understand why is there a need to chop the input of the WCT amplifiers. Why can't the mux permanently connect the input of the WCT amplifier to the analog input based on the mux setting ? Why must it be chopped?

  • 0
    TI__Guru 66466 points

    Hello Alex,

    The WCT amplifiers are chopped to help reduce the 1/f noise. Without chopping, this noise is rather dominant in the WCT output.

    The ADS1296R does have options to adjust the chopping frequency as shown in Table 17. The increase in leakage current on the connect channel input due to WCT can be estimated from Figure 61 and Figure 62.

    Best Regards,