JAJSDF5A June 2017 – April 2020 ADC12DJ3200
PRODUCTION DATA.
After converting the analog voltage to a digital value, the digitized sample can either be sent directly to the JESD204B interface block (DDC bypass) or sent to the digital down conversion (DDC) block for frequency conversion and decimation (in dual-channel mode only). Frequency conversion and decimation allow a specific frequency band to be selected and output in the digital data stream while reducing the effective data rate and interface speed or width. The DDC is designed such that the digital processing does not degrade the noise spectral density (NSD) performance of the ADC. Figure 67 illustrates the digital down converter for channel A of the ADC12DJ3200. Channel B has the same structure with the input data selected by DIG_BIND_B and the NCO selection mux controlled by pins NCOB[1:0] or through CSELB[1:0].