Analog to digital conversion with multiple channels
Analog to digital conversion with multiple channels
(OP)
Hello,
Upfront i would like to tell that the Subject hasn't got much to do with my doubt.
I'm using the SAB80C515 and i would like to know if it is possible to connect all the analog inputs of the A/D to the same point?
Will it affect the accuracy of the readings??
Upfront i would like to tell that the Subject hasn't got much to do with my doubt.
I'm using the SAB80C515 and i would like to know if it is possible to connect all the analog inputs of the A/D to the same point?
Will it affect the accuracy of the readings??
Best regards, Carlos Cardoso





RE: Analog to digital conversion with multiple channels
Without knowing the MFR and exact type# : one analog input
pin can be connected to one analog signal only but you may
add an analog ( 1 of 4, 1 of 8 etc.)usually MOSFET selector
before a pin to increase the number of signals so you can
connect any of the 4,8,etc. signals to an input pin -- one
at a time.
The SAB80C515 I looked up has a built-in selector so it has
8 analog input pins. It is usual for uC-s to use a pin selectably either as analog OR digital I/O. If you need
more, tell me the make and exact type#.
<nbucska@pcperipherals.com>
RE: Analog to digital conversion with multiple channels
A mux can be had to have many I/O's connected to it. You select the channel using as little as 2 bits (depending on how many input channels you have into the mux- 2 bits would be for 3 inputs, 3 bits for 7, etc)
RE: Analog to digital conversion with multiple channels
3 bits =8
n = 2 to the n
<nbucska@pcperipherals.com>
RE: Analog to digital conversion with multiple channels
RE: Analog to digital conversion with multiple channels
RE: Analog to digital conversion with multiple channels
RE: Analog to digital conversion with multiple channels
Best regards, Carlos Cardoso
RE: Analog to digital conversion with multiple channels
RE: Analog to digital conversion with multiple channels
I have not worked with microprocessors but with microcontrollers that I use the reference voltage can be changed easily in software to be internal or external
(assuming you have an external reference voltage source).
RE: Analog to digital conversion with multiple channels
Oversampling with post filtering could reduce the noise; is that what you mean?
But the fundamental accuracy is limited by the reference signal and the A/D circuitry itself, regardless of the number of inputs used.
TTFN
RE: Analog to digital conversion with multiple channels