ADC with very low DNL for pulse height histogram MCA ?

I'm looking for an 100 kHz or faster analog to digital converter with very low DNL ( much lower than 0.1 lsb or 10%) to be used for pulse height MCA analysis by creating a histogram of digitized count values. Standard PCI interface cards have DNL of 0.2 lsb which produces noisy histograms when repeatedly digitizing a triangle wave spanning the entire adc input range. PCI card would be best, but external device or just the adc chip itself would be useable. Wilkinson style is one known for such low DNL.

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Steve Parus
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