1 Reply Latest reply on Dec 27, 2010 5:28 AM by gautamd_

    ADC DelSig conversion rate setup

      Question: When setting up the Conversion Rate on the DeltaSigma block, is that rate driven by interrupts? So if I sample at 100Ksps (10us), is the interrupt called every 10us to take a sample, or is the timming derived some place else? Where/which interrupt is called to perform the start-conversion?



        • 1. Re: ADC DelSig conversion rate setup
                  Hi Keith, The 'Conversion Rate' of an ADC is the measure of the number of converted (digital) values obtained from the ADC. The resolution and the conversion rate of Delta Sigma ADC are inversely proportional. The clock frequency of the ADC is chosen according to the Resolution and the Conversion rate chosen by the user. Its grayed out and user doesn't have any control over it. However, the minimum clock frequency of the ADC is 128KHz, thereby bringing about min and max Conversion rate for an ADC for given value of resolution. The Hardware SOC (Start of Conversion has to be chosen to control the conversion rate externally. A signal on EOC is obtained on End of every conversion. Interrupt routine can be executed upon getting triggered by this interrupt source. Regards, dasg