How is the input voltage of an ADC calculated?
The input voltage is computed as a function of the reference voltage, the constant run-up time period, and the measured run-down time period. The run-down time measurement is usually made in units of the converter’s clock, so longer integration times allow for higher resolutions.
How is the total ADC conversion time calculated?
The Total ADC Conversion Time is calculated as follows: Tconv = Sampling time + 12.5 cycles
How does an ADC converter work in a computer?
An ADC (Analog-To-Digital) converter is an electronic circuit that takes in an analog voltage as input and converts it into digital data, a value that represents the voltage level in binary code. The ADC samples the analog input whenever you trigger it to start conversion.
What are the limitations of the integrating ADC?
The basic design of the dual-slope integrating ADC has a limitations in linearity, conversion speed and resolution. A number of modifications to the basic design have been made to overcome these to some degree. The run-up phase of the basic dual-slope design integrates the input voltage for a fixed period of time.
When is an ADC test defined to be static?
Static Test A test is defined to be static when the input signal to the ADC under test is slowly varied. The output results are the same as for a constant signal being input. Typically a ramp is chosen as the input signal for such a test. Dynamic Test A test is defined to be dynamic when the input signal varies in such a way that the
What’s the difference between ADC and ADC precision?
The input signal is usually an analog voltage, and the output is a binary number. The ADC precision is the number of distinguishable ADC inputs (e.g., 4096 alternatives, 12 bits). The ADC range is the maximum and minimum ADC input (e.g., 0 to +3.3V).
How is the theoretical resolution of an ADC determined?
If there is no electrical noise and we use a 12-bit ADC, then the theoretical resolution is 1.5cm/4095, or about 0.0004 cm. In most systems, the resolution of the measurement is determined by noise and not the number of bits in the ADC. Time quantization is the time difference between one sample and the next.