Old versions of the ADV7180 datasheet show two capacitors connected to the VREFP and VREFN pins on the ADV7180. Modern ADV7180 datasheets show one capacitor between the VREFP and VREFN pins.
Which is the correct setup?
Actually both setups are correct.
Originally one 0.1uF capacitor to ground was connected to the VREFP pin and another 0.1uF capacitor to ground was connected to the VREFN pin.
It was found however that the same performance could be achieved by connecting one 0.1uF capacitor between the VREFP and VREFN pins.
Analog Devices decided to recommend the one capacitor setup as this would save customers on their bill of materials.
The capacitance on the VREFP and VREFN pins are used as a reference by the ADC in the ADV7180.
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