![]() 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. For the ADC, let's assume that the conversion-rate, interface, power-supply, power-dissipation, input-range, and channel-count requirements are acceptable before we begin our evaluation of the overall system performance. ![]() Often the ADC is the key component in the signal path, so we must be careful to select a suitable device. Each component in the system will have an associated error the goal is to keep the total error below a certain limit. We start by establishing our overall system-performance requirements. Understanding ADC specifications will also help you in selecting the right ADC for your application. What happened? What changed from the initial analysis? A thorough understanding of ADC specifications will reveal subtleties that often lead to less-than-desired performance. 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. ![]() Sometimes, much to the surprise and consternation of engineers, a data-acquisition system will exhibit much lower performance than expected. Using a 12-bit-resolution analog-to-digital converter (ADC) does not necessarily mean your system will have 12-bit accuracy.
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