Hello,
Recently some senior members had a discussion about pitfalls of paralleling decoupling caps in the main message board.
http://www.8052.com/forum/read.phtml?id=147206
which was very interesting for me.

For decoupling of sensitive analog ICs like high resolution ADCs which need utmost care I saw Analog devices recommended this scheme for decoupling of AD676(ADC, 16 bit, 100KSPS)

data sheet available at: http://www.analog.com/UploadedF.../AD676.pdf
So with what I've learnt I feel that this is not the best scheme because even if imagine that electrolyte capacitor's ESR be enough high to over damp the ringing caused by current spikes of AD676 even then we should expect some ringing in short periods of time which can damage precision of AD676. Is my assumption right?
Also about using inductive filters I read in the forum some senior members recommend it:
http://www.8052.com/forum/read.phtml?id=115988
I assume these filters are good as long as they are used for digital chips or tolerant analog chips because for sensitive analog chips they may cause ringing even if they carefully over damped. But I saw some manufacturers recommend inductive filters for power supply of ADCs. Here is Atmel's recommendation for decoupling of analog pin of ATMega128(AVR ,10bit ADC, 15KSPS)

datasheet available at:
http://www.atmel.com/dyn/resou...oc2467.pdf
isn't it necessary to at least use a series resistor after the inductor? is this acceptable ?

Thank you very much
Reza,