ADC Sampling Rate (LPCSS06-EVK)

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ADC Sampling Rate (LPCSS06-EVK)

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caden013
Contributor III

Hi all,

I am using the on-board ADC to take in a sinusoidal voltage input at 1kHz. I have run into an issue though: the sampling rate is not high enough. I see in the datasheet that the chip supports up to 2 Msamples/second; however, my ADC is not producing the accurate results that I want. I am wanting to know how to change these settings to where I can achieve the highest accuracy possible. I have tried to change the ADC clock settings in the clocks diagram tab but to no avail. I have attached the file with the ADC values (the values that should represent a sine wave) so you can see my issue.

If someone could help, I would greatly appreciate it.

Thanks in advance.

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frank_meyer
Senior Contributor II

I would start with reading the ADC section of the user manual.

The sampling frequency is determined by your method of triggering a conversion.

I am using a timer in one of my applications (for the LPC54628):

adcConvSeqConfigStruct.triggerMask = ADC_TRG_CTIMER0_MAT3;

Enabling/running the timer will start the sampling.

The ADC clock determines only the ADC-internal timing, e.g. sampling and conversion times.