What are different factors should be considered 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 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.
What is dynamic range of ADC?
Typically expressed in dB, dynamic range is defined as the range between the noise floor of a device and its specified maximum output level. An ADC’s dynamic range is the range of signal amplitudes which the ADC can resolve; an ADC with a dynamic range of 60dB can resolve signal amplitudes from x to 1000x.
How is the resolution of the ADC determined?
For example, if the full scale mea- surement voltage range is 0 to 3 volts, and the ADC bit resolution is 12 bits, then the ADC voltage resolution can be calculated to be 0.7326 mV/bit.
What are the selection criteria for 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 is the voltage range of an ADC?
The range of voltage over which the ADC is capable of doing conversions, essentially the positive reference voltage and the negative reference voltage levels. Voltage dividers can also be used to bring the input voltage within the range of the converter. (The ADC0809 has a range from -0.1V up to Vcc + 0.1 V.
Which is better, a pipelined ADC or a SARS ADC?
For a given architecture type, the higher an ADC’s resolution is, the lower its speed will be (and vice versa), since higher resolution means more data to convert. Pipelined ADCs, however, are a somewhat unique method: they combine some of the best qualities of SARs and flash-type ADCs, managing to achieve both high speed and high resolution.