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Discussion Groups | Freescale DSPs | help needed in setting the sampling frequency

Technical discussions about Freescale (Motorola) DSPs (including the DSP56000, DSP56300, DSP56600, 56800 DSPs).

  

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help needed in setting the sampling frequency - kubra_n - Feb 28 8:51:00 2004



Hi,

iam simply confused.
i did read the datasheets and have understood the following.

from the datasheet ,and from the register ADCR2 which gives u the
clock divisor frequency

N= clock dividor select value
=DIV +1

FADC = FIPR/(2N)

FIPR = 40MHz/2 = 20MHz

DIV N FADC

0011 (default start)4 5MHz
0100 5 4MHz
.
.
.
1100 12 1.66MHz
.
1111 16(dec) 1.25MHz

ADLST1 and 2 REGISTERS
only choose the respective channels to be used

ADSDIS Register enables the respective sample in a ADLST1 -2

and from what i read ,i have understood that adc takes 8.5clock
cycles to do 1 sample conversion,and an addition of 6 clock cycles
for the next sample conversion.

but then what is the minimum sampling rate that can be set?
and what r the sampling rates that 56805 adc can take?

iam getting confused with the adc clock and the samping rate.

can anyone shed some light on this pls.

thanx in advance. Bye,
kubra




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