Analog-to-Digital Conversion › lesson 35 of 100 · Intermediate

Understand Multiplexed ADC Inputs

This lesson is part of the Analog-to-Digital Conversion course, and after completing it, you will be able to understand the challenges and solutions for multiplexed ADC inputs. You will learn how to apply this knowledge to real-world scenarios.

Multiplexed ADC inputs can be challenging due to switching errors, but solutions such as sample and hold circuits and multiplexing techniques can help t

In a real-world scenario, consider a data acquisition system that needs to measure multiple analog signals simultaneously. The system uses a multiplexed ADC to switch between the different input channels, but the switching process can introduce errors due to the settling time of the multiplexer. To minimize these errors, a sample and hold circuit can be used to hold the input signal constant during the conversion process.

The multiplexing technique used can also affect the performance of the ADC. For example, a time-division multiplexing technique can be used to switch between the different input channels, while a frequency-division multiplexing technique can be used to separate the different input signals in the frequency domain.

In addition to these solutions, the layout and design of the ADC and multiplexer can also play a crucial role in minimizing switching errors. For example, the parasitic capacitance and inductance of the multiplexer can affect the settling time and introduce errors.

Ejemplos

• A data acquisition system uses a multiplexed ADC to measure multiple analog signals simultaneously.The system uses a sample and hold circuit to minimize switching errors.
• A medical device uses a multiplexed ADC to measure multiple physiological signals.The device uses a time-division multiplexing technique to switch between the different input channels.
• An industrial control system uses a multiplexed ADC to measure multiple process variables.The system uses a frequency-division multiplexing technique to separate the different input signals in the frequency domain.

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