Contents
How is the accuracy of the ADC dependent?
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.
What causes an ADC to make an error?
One of the biggest potential sources of errors in an ADC with an internal or external reference is the reference voltage. Often, if the reference is included on-chip, it is not specified adequately.
What are the limitations of a high speed ADC?
Two fundamental limitations to maximizing SFDR in a high-speed ADC are the distortion produced by the front-end amplifier and the sample-and-hold circuit; and that produced by nonlinearity in the transfer function of the encoder portion of the ADC. The key to achieving high SFDR is to minimize both sources of nonlinearity.
Do you have to use a 12 bit ADC?
This article explains how to select an ADC based on the system requirements and describes the various sources of error when making an ADC measurement. Using a 12-bit-resolution analog-to-digital converter (ADC) does not necessarily mean your system will have 12-bit accuracy.
How many bits of accuracy can a 12 bit ADC give?
For example, a 12-bit ADC with 4LSBs of integral nonlinearity error can give only 10 bits of accuracy at best (assuming the offset and gain errors have been calibrated). A device with 0.5LSBs of INL can give 0.0122% error or 13 bits of accuracy (with gain and offset errors removed).
Which is the best ADC for data acquisition?
The high resolution Σ-∆ measurement ADC has revolutionized the entire area of precision sensor signal conditioning and data acquisition. Modern Σ-∆ ADCs offer no- missing code resolutions to 24 bits, and greater than 19-bits of noise-free code resolution.
What is the range of the ADC calculator?
The larger the ADC, the wider the range. This calculator converts the number of bits entered into it up to a value of 31. 2 31 =2147483647, so the value can range from 0 to 2147483646. After this value of 31, the calculator assumes that all other numbers entered in are already converted to the total number of bits.
What happens when ADC is discovered after initial prototype run?
When this is discovered after the initial prototype run, a mad scramble for a higher-performance ADC ensues, and many hours are spent reworking the design as the deadline for preproduction builds fast approaches. What happened? What changed from the initial analysis?