How to decide the bits of the decimation filer (CIC filter)?

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Decimation filter

how to decide the bits of the decimation filer (CIC filter)???
if my sigma delta adc is two stage (one bit),and decimation rate is 256.


thanks advance!!!!
 

Decimation filter

anybody know????
please help me
or please give a link about that!!!
thanks
 

Re: Decimation filter

hi

M+K*log2(N)
--R. Schreier's Understanding Delta-Sigma Data Converters

M: input to filter
K: order+1
N: oversampling rate

in your case, 25 bits is sufficient.
 

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