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ADC12J4000: Definition of Analog Differential Input Signal Levels

Part Number: ADC12J4000

What is the definition of the differential full scale input range for the ADC12J4000? The data sheet shows that the full scale range can be set between 500mV and 950mVpp (7.3.5.4), it is not clear if this is 500-950mVpp after a differential amplifier in the part or just the difference measurement between the two differential analog inputs. If it is after a differential amplifier in the part then the analog signal on each input would be 1/4 of the peak-to-peak value, if just a measurement of the analog inputs, then then each input would be 1/2 of the peak to peak value.