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value of R and C for internal clock of ADC0804.

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uday mehta

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The given value of R is 10 K and C is 150 pf in datasheet of ADC0804. Is it necessary to use these values. In this case the analog to digital conversion time is 110uf. Is this time also fix. If yes then i achieve this time by using different values of R & C. for example R = 150 ohm & C = .01 uf. can I use different values of R and C.
please help me.
 

Generally it is the product of R and C that matters in such circuits. In 0804, RC serve as input to non-inverting terminal of schmitt trigger. In general cases experimenting with different values would make no difference, but here using a higher capacitance will hamper conversion operation. It is recommended to keep capacitance lower and resistance higher. Yet you can go upto 1000pF safely. Also the frequency can be calculated as 1/RC and you should keep in mind that fclk should not exceed maximum specified freq ie 1.4MHz.
 
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