Q: What power supplies does the AD4858 require?

The AD4858 requires the following five supplies:

• V_CC and V_EE, the positive and negative analog input buffer supplies. VCC should be at least 3.2 V higher than the maximum expected input voltage (INx+ or INx-). VEE should be at least 3.2V lower than the minimum expected input voltage (INx+ or INx-).
• V_DD, the 5V core supply
• V_DDH, the internal LDO supply, that should be between 2.2 and 5.25V. Alternatively, the internal LDO can be bypassed so V_DDH should be tied to AGND and 1.8 V should be applied to V
• V_IO, the digital input/output power supply, that should be within 0.9 V and 5.25V

See Power Consideration section of the datasheet for more info.