Q: What reference voltage can be used with AD4880?

The AD4880 requires a 3V VREF; suitable references are the LTC6655(LN) , ADR4530 , LT6657

Q: Is there galvanic isolation between the two channels?

While the two signal chains are physically separate within the package, the creepage and clearance distances would not meet functional isolation requirements, although the separation of the channels helps reduce crosstalk

Q: Is the AD4880 suitable for simultaneous sampling applications?

Yes, even though the AD4880 offers the flexibility to control both channels independently, its design with two identical, well-matched ADCs allows simultaneous sampling with very low channel-to-channel crosstalk

Q: Do I need to use external power supply decoupling capacitors with the AD4880?

No, supply decoupling capacitors are integrated into the part for optimal performance, saving on BOM and PCB space

Q: Why are there two different test conditions for SNR, THD, etc. - one with Cfb = 0 pF and one with Cfb = 220 pF?

These are different use-cases: A capacitor across the FDA feedback resistor limits the input noise bandwidth for AC signals, whereas for high slew rate stepped DC signals, removing this capacitor opens up the bandwidth for faster settling

Q: Can the results from both AD4880 channels be read over a single digital interface port (SPI or LVDS)?

No, each AD4880 channel has its own separate ADC die, so each channel must be interfaced with independently

Q: Can the AD4880 accept single-ended inputs?

Yes, the AD4880 integrates a fully differential amplifier (FDA) at the input of each channel; these FDAs can be driven with either single-ended or differential signals