Hello


how can i make 16 bit analogue to digital converter 12 bit or 8 bit .
even if we can cheat.


thanks

sam

 

Do you mean change the 16bit number into an 8 or 12 bit number? If that is the case just do a bit shift to the right.

unsigned int ADCvalue = 32767; //16 bit

unsigned char ADC8bit = ADCvalve >> 8;

this way you keep the 8 most significant bits for an 8 bit number. To make it a 12bit number just shift 4 to the right instead of 8.

Hope this is what your looking for?

 

Why do you want to make it?

You can buy one of the shelf.

 

because i need to change the sampling frequancy by changing the bits for example
if i have cut off frequancy 3.4 it need to be sampled at 8 khz i need to 8 bit ADC if i need to sample at 12 khz or 16 khz at the same IC what i need to do?

thanks

 

Some chips are driven by external clock signals which determine the sampling frequency.

Which ADC chip are you using?

 

I think you need to look for a clock signal such as 555 Timer.

 

Hi mik3
which chip you prefer me to use? for changing the sampling frequency 2 times
one for sampling frequency= 8 kHz,
2nd for sampling frequency= 16 kHz

which IC you prefer ?

 

Hi mik3
which chip you prefer me to use? for changing the sampling frequency 2 times
one for sampling frequency= 8 kHz,
2nd for sampling frequency= 16 kHz

which IC you prefer ?

I have never used a ADC chip on its own (I used ADC on PICs). Find one which can be clocked externally and use two 555 to choose between two frequencies.