Hello, I'm looking to clarify the capacitor type recommended in the AD7124 datasheet, which states:
"Decouple AVDD with a 1 µF tantalum capacitor in parallel with a 0.1 µF capacitor to AVSS on each pin. Place the 0.1 µF capacitor as close as possible to the device on each supply, ideally right up against the device. Decouple IOVDD with a 1 µF tantalum capacitor in parallel with a 0.1 µF capacitor to DGND."
Should a tantalum be used for the 1 µF as well as the 0.1 µF? Or just a tantalum for the 1 µF and a ceramic for the 0.1 µF? Thank you very much.
We used both ceramic capacitors for 1uF and 0.1uF coupling capacitors on the AD7124 evaluation board. Tantalum is much cheaper but I would suggest to use the equivalent in ceramic (X5R o X7R) as it has better ESR/output ripple.