Table of Contents
What are different factors should be consider for selecting ADC?
There are a few main items to consider, before selecting which ADC is best suited to your project.
- Availability/Cost.
- Precision/Resolution (number of bits)
- Accuracy (error in conversion)
- Speed (time for one conversion, different from clock speed)
- Voltage Range.
- Multiplexing.
- Ease of Use.
What are the factors affects the accuracy of the ADC?
Accuracy of the ADC is dependent on several key specs, which include integral nonlinearity error (INL), offset and gain errors, and the accuracy of the voltage reference, temperature effects, and AC performance.
How do I choose ADC?
ADC Selection Criteria to Consider As you explore the world of ADCs, it may be helpful to refresh your memory on how resolution, speed, accuracy, and noise will affect your choice. Resolution refers to the number of output bits that the ADC can generate per conversion.
Which is the major factor to determine the quality performance of a D converter?
The performance of an ADC is primarily characterized by its bandwidth and signal-to-noise ratio (SNR). The bandwidth of an ADC is characterized primarily by its sampling rate.
On what factors do the resolution of ADC depend?
The number of binary digits (bits) that represents the digital number determines the ADC resolution. However, the digital number is only an approximation of the true value of the analog voltage at a particular instant because the voltage can only be represented (digitally) in discrete steps.
What is resolution in ADC?
Resolution. The ADC resolution is defined as the smallest incremental voltage that can be recognized and thus causes a change in the digital output. It is expressed as the number of bits output by the ADC. Therefore, an ADC which converts the analog signal to a 12-bit digital value has a resolution of 12 bits.
How the voltage reference affects ADC performance?
Unfortunately, the voltage-reference designs in this article can degrade ADC performance by adding unwanted tem- per ature drift and initial gain error. Higher-performance sys tems with 21+ bits may require a voltage-reference design that addresses these issues.
What to consider when choosing an ADC?
ADC Selection Criteria to Consider. As you explore the world of ADCs, it may be helpful to refresh your memory on how resolution, speed, accuracy, and noise will affect your choice. Resolution refers to the number of output bits that the ADC can generate per conversion. This figure determines the smallest input signal that the system can represent.
What should the reference voltage of an ADC be?
Figure 2: The reference voltage of an ADC (10-bit is shown) results in output variations. The V REF for your ADC should be very stable regardless of the temperature it experiences. It should demonstrate excellent performance over temperature. In short, the lower the number of ppm/°C, the better.
What is the output of an ideal unipolar ADC?
With an ideal unipolar ADC, an input of lower than V R E F 2 N + 1 will give an output of 0- as you can see above, below 1/16 of the 2V reference voltage the output code will be 0. Between V R E F 16 and V R E F 16 + V R E F 8 the output count will be 1 and so on, with each step the same.
What is the resolution of ADC?
Resolution refers to the number of output bits that the ADC can generate per conversion. This figure determines the smallest input signal that the system can represent. Resolution also defines the smallest incremental change to the analog signal that the ADC can express.