Howtosignalprocessing
- What is the sampling rate of an ADC?
- What is sampling in analog to digital conversion?
- How do you choose ADC sampling time?
- What is the maximum sampling frequency of the ADC?
What is the sampling rate of an ADC?
The sampling rate is the frequency expressed in Hertz (Hz) at which the ADC samples the input analogue signal. As mentioned before, the sampling interval is the time between successive samples: the sampling rate is thus the inverse of the sampling interval.
What is sampling in analog to digital conversion?
An input signal is converted from some continuosly varying physical value (e.g. pressure in air, or frequency or wavelength of light), by some electro-mechanical device into a continuously varying electrical signal.
How do you choose ADC sampling time?
The ADC needs a minimum of 2.5 clock cycles for the sampling and 12.5 clock cycles for conversion for 12-bit mode. With a 60 MHz ADC clock, it can achieve 4 mega sample per second. For a higher sampling speed, it is possible to reduce the resolution down to 10, 8 or 6 bits.
What is the maximum sampling frequency of the ADC?
It will be in the 8 to 10 KHz range. It depends on the waveform you want to sample. The less like a sine wave to more sample point are needed so the lower the frequency the waveform can be. A PIC32 can have a maximum sampling rate of 1000k samples per second and a PIC24 can have 500k samples per second.
