zanor said:
okey..
I found another one, h**p://www.elfa.se/pdf/73/730/07306719.pdf
I think I will go for this one, there's just one thing I don't understand. On page 15 there's a schema for the inputs, but are this internal in the chip or is this someting I have to do for each of the inputs?
It's clearly stated in datasheet:
An equivalent circuit for one of the ADC78H90’s input channels
is shown in Figure 6.
The capacitor C1 in Figure 6 has a typical value of 3 pF, and
is mainly the package pin capacitance. Resistor R1 is the on
resistance of the multiplexer and track / hold switch, and is
typically 500 ohms. Capacitor C2 is the ADC78H90 sampling
capacitor, and is typically 30 pF.
Hence all are internal, you don't have to provide them external.