B babboy12345 New Member Feb 25, 2009 #1 First at all, i used a music as my input pass thought a 4kHZ low pass filter and go into ADC,so i would like to know about is that this MCU can sampling the voltage or not. The voltage of music is around how much? Can i know the minimun voltage of Vref+ ? Can i know the maximun ampere of VDD and ADC?? Last edited: Feb 25, 2009
First at all, i used a music as my input pass thought a 4kHZ low pass filter and go into ADC,so i would like to know about is that this MCU can sampling the voltage or not. The voltage of music is around how much? Can i know the minimun voltage of Vref+ ? Can i know the maximun ampere of VDD and ADC??
Nigel Goodwin Super Moderator Most Helpful Member Feb 25, 2009 #2 All you need to know is listed in the datasheet.
B babboy12345 New Member Feb 25, 2009 #3 i cant get the Vref+.....can you tell me?? And for the sampling rate,is that my circuit can word?
Nigel Goodwin Super Moderator Most Helpful Member Feb 25, 2009 #4 babboy12345 said: i cant get the Vref+.....can you tell me?? And for the sampling rate,is that my circuit can word? Click to expand... Use 5V for Vref, as it's a non-critical application - you need to sample about 10,000 times a second for a 4KHz filter, easily done. Simply amplify the audio to give LESS than 5V p-p, centered around 2.5V DC.
babboy12345 said: i cant get the Vref+.....can you tell me?? And for the sampling rate,is that my circuit can word? Click to expand... Use 5V for Vref, as it's a non-critical application - you need to sample about 10,000 times a second for a 4KHz filter, easily done. Simply amplify the audio to give LESS than 5V p-p, centered around 2.5V DC.