AD1877 decoupling capacitor

Please teach me AD1877.

I know that AD1877 is not recommended for New Designs.

Tantalum capacitor of 4.7uF is recommended for decoupling capacitor.

ESR of the ceramic capacitor has been improved.

Changes to the ceramic capacitor is a problem?

Thank you.

    •  Analog Employees 
    on Jul 18, 2016 8:07 PM over 4 years ago

    Hello kotoo,

    It is not only the ESR that is important. It is how the value of the capacitance will change with frequency and with temperature extremes. You will find that most X7R style of ceramic capacitors do not behave well over temperature, voltage and frequency. Yes, capacitors have come a long way since then. The NPO ceramics are quite good. There are some companies have developed the niobium oxide capacitors that look interesting. I have not tried them personally but my point is to look deeper into the specifications and if you do choose to use a ceramic composition then use an NPO. Getting one in 4.7uf might be a challenge.

    In looking at this datasheet. It recommends splitting the ground plane. I would not do that anymore. One solid ground plane will work better and then properly terminating and damping the digital signal lines is very important. When this datasheet was written not much of this was widely known.

    Dave T