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Verify the ADC speed with LPC5460

Question asked by George Chancellor on Nov 6, 2017
Latest reply on Nov 10, 2017 by George Chancellor

I am trying to verify the ADC speed with the LPCXpresso54608 eval board.

I stated with the lpc_adc_dma example and then modified the dma to have a linked list of 100 descriptors which then places the ADC data into an array of 100.  I set the ADC to be in burst mode .  I then send in a 100KHz sine wave, but what I receive looks like the ADC is sampling at maybe 400KHz, versus the 180 / 3 =  60MHz that I set it to.

 

Is there a better way to do this.

see attached file

 

Thanks

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