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588 Views
Contributor III

Hi,

I'm using LPC55S16 (100 pin package) and configured the ADC in 16-bit resolution. While reading the value, ADC value get oscillated more. How I can reduce the oscillation?. Even if i used average of 50, it gets oscillated. Kindy resolve it, if it is possible

1 Solution
536 Views
NXP TechSupport

Hi,

Pls refer to the spec of ADC of LPC5516,the ENOB is 12.1 bits in 16 bits resolution and single-ended mode, in other words, the low 4 bits is random, the random value is 16 LSB.

But you said that the Oscillating of value for current and previous value is about +/-80 LSB, it is too big, can you share the analog circuit and external analog source impedance?

BR

XiangJun Rong

3 Replies
574 Views
NXP TechSupport

Hi,

Can you explain what the ADC sampling results oscillation is? If you sample a DC voltage, does the ADC sampling results oscillate? or just the low 3 bits oscillate for every ADC results.

BR

XiangJun Rong

564 Views
Contributor III

Here we used DC voltage samplings (max. 3.3V) and taken average of 50. Oscillating of value for current and previous value is about +/-80. We used it to verify linear POT which datasheet is attached here

537 Views
NXP TechSupport

Hi,

Pls refer to the spec of ADC of LPC5516,the ENOB is 12.1 bits in 16 bits resolution and single-ended mode, in other words, the low 4 bits is random, the random value is 16 LSB.

But you said that the Oscillating of value for current and previous value is about +/-80 LSB, it is too big, can you share the analog circuit and external analog source impedance?

BR

XiangJun Rong