Design trade-offs of using SAR and Sigma Delta Converters for Multiplexed Data Acquisition Systems
Maithil Pachchigar, Analog Devices
EDN (November 17, 2015)
Multiplexed data acquisition systems (DAS) utilized in industrial process control, portable medical devices and optical transceivers need increased channel density, where the user wants to measure the signals from multiple sensors and monitor and scan many input channels in to a single or several ADCs. The overall benefit of multiplexing is fewer number of ADCs per channel required, saving print circuit board (PCB) space, power and cost. Some systems in automated test equipment and power-line monitoring applications demand dedicated track and hold amplifier and ADC on per channel basis for simultaneously sampling the inputs to obtain increased sampling rate per channel and to preserve the phase information at the expense of additional PCB area and power.
System designers make trade-offs based on performance, power, space, and cost requirements in their end application. They select one of the converter architectures and topologies and implement their signal chain using either discrete or integrated components available in the market. The figure 1 shows a simplified block diagram of multiplexed DAS that monitor and sequentially sample various sensor types. Sometimes signal chains utilize either buffer amplifier or programmable gain amplifier between the multiplexer and ADC.
To read the full article, click here
Related Semiconductor IP
- Bluetooth Low Energy 6.0 Digital IP
- Ultra-low power high dynamic range image sensor
- Flash Memory LDPC Decoder IP Core
- SLM Signal Integrity Monitor
- Digital PUF IP
Related White Papers
- Data acquisition systems and SoCs - A guide
- Pipeline vs. Sigma Delta ADC for Communications Applications
- Universal Flash Storage: Mobilize Your Data
- Understanding sigma delta ADCs: A non-mathematical approach
Latest White Papers
- How Next-Gen Chips Are Unlocking RISC-V’s Customization Advantage
- Efficient Hardware-Assisted Heap Memory Safety for Embedded RISC-V Systems
- Automatically Retargeting Hardware and Code Generation for RISC-V Custom Instructions
- How Mature-Technology ASICs Can Give You the Edge
- Exploring the Latest Innovations in MIPI D-PHY and MIPI C-PHY