Design Trade-Offs of Using Precision Sar And Sigma-Delta Converters for Multiplexed Data Acquisition Systems

Multiplexed data acquisition systems (DAS) are utilized in industrial process control, portable medical devices, and automated test equipment. In all these use cases multiplexed DAS systems need increased channel density. Designers want to measure the signals from multiple sensors, monitoring and scanning many input channels into a single ADC or several ADCs. This technical article from Analog Devices covers the design trade-offs of using precision SAR and Sigma-Delta converters, and the benefits of multiplexing. With fewer ADCs required per channel, there are savings in printed circuit board (PCB) space, power and cost.

Some systems in automated test equipment and power line monitoring applications demand dedicated track and hold amplifier. They also demand ADC on a per channel basis for simultaneously sampling the inputs to obtain increased sampling rate per channel – and to pre-serve the phase information at the expense of additional PCB area and power. System designers must make trade-offs based on performance, power, size, and cost requirements for their applications.

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