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Noise-free Resolution of ADuCM350

Question asked by amf on May 24, 2017
Latest reply on Jun 19, 2017 by mark.ramos

Mark,

     On your new board where you've worked hard to keep the noise low, what do you get for the ADuCM350's noise-free resolution (there's no such spec listed in the datasheet).  That is, for 160,000 samples/sec what is the effective number of bits (or noise-free resolution)?  I'm getting about 12 bits, see attached, when I do the measurement for ADC offset (VBIAS against VBIAS).  At 900 SPS, there's zero noise, but at 160,000 SPS, I get ~20 counts peak to peak noise.  Is

this what you see?

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