Maximum sample rate of ADC

[Jonas]

Hi, 

I've looked through the documentation and comments but couldn't find out what the maximum sampling frequency of the ADC on a BeagleBone Black is, using the library.

These are the methods (of class AnalogInput) in question:

	/**
	* Grabs a number of readings from the analog input, sampled
	* with the specified frequency.
	*
	* @param amountSamples the amount samples to be taken
	* @param frequency the frequency that should be used for sampling
	* @return an array of values ranging between 0.0 and 1.0.
	* These represent the percentage of the voltage reference
	* that were supplied to the pin when the measurement was
	* taken.
	*/
	double[] sample(int amountSamples, float frequency);
	/**
	* Grabs a number of readings asynchronously from the analog input,
	* sampled with the specified frequency.
	* The program will continue execution while the samples are being
	* taken.
	*
	* @param amountSamples the amount samples to be taken
	* @param frequency the frequency that should be used for sampling
	* @return A future containing an array of the sampled values.
	* These values range between 0.0 and 1.0, which represents
	* the percentage of the reference voltage that has been
	* measured.
	*/
	Future<double[]> sampleAsync(int amountSamples, float frequency);

Thanks for any advice!

[Datenheld]

Hi Jonas,

the max sampling frequency should be 8MHz, but in reality, I'd be surprised to achieve this. The ADC implementation has various problems anyway. I do not advise to sample high frequencies with it. Maybe a future update will solve this.

HTH

[Datenheld]

Moreover, the frequency won't be accurate. It will be calcuated to the nearest possible value as you can only set it via delay times and dividers.