8-8it Vs 10 bit ADC

[fantabulous68]

1. An output has pulses that are as much as 0.01 volts. This value may come across as being insignificant but when reading certain sensors with an 8-bit Analogue to Digital converter, these pulses can change the 8-bit value as much as 2.

How will a 10 bit ADC improve this value? Just by providing better resolution?

 

[ronsimpson]

If your 0.01 volt signal changes a 8 bit ADC by 2 then
it will change a 10 bit ADC by 8. (4x)

 

[Nigel Goodwin]

As suggested, it gives you four times the resolution - but why not just amplify the signal anyway?.

 

[fantabulous68]

not just amplify the signal anyway?.

lol Nooooooooooo, i Want to get RID of that 0.01V "spike" (output voltage from sensor) which results in noise/inaccurate readings. Sorry i was not clear in the problem statement. I know i should use a capacitor. I just wanted to know the affect on the measurements that result from using 10-bit ADC on output of a sensor as opposed to 8-bit ADC


Thanks.

 

[Nigel Goodwin]

lol Nooooooooooo, i Want to get RID of that 0.01V "spike" (output voltage from sensor) which results in noise/inaccurate readings. Sorry i was not clear in the problem statement. I know i should use a capacitor. I just wanted to know the affect on the measurements that result from using 10-bit ADC on output of a sensor as opposed to 8-bit ADC

Fairly obviously, four times the resolution gives four times the change - the best way to get rid of it is at the source, if you can? - where is the spike coming from?.

 

[fantabulous68]

where is the spike coming from?.

The GP2D12 sensor

"spike" (output voltage from sensor)

 

[Noggin]

You'll also need to ensure that your analog reference voltage is clean as well as the analog ground. Noise can enter into the ADC readings just as easily there as from the input pin.

 

[Sceadwian]

Try reading this, it may shed some light.
It's for AVR's specifically, but applies to any ADC.
https://www.electro-tech-online.com/custompdfs/2009/10/doc8003.pdf

Explains how depending on your requirements you can get 10 bits out of an 8 bit DAC.