18-bit, 2-Msps Isolated Data Acquisition Reference Design to Achieve Maximum SNR and Sampling Rate
TIDA-00732
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Key Document
- 18-Bit, 2-MSPS Isolated Analog Acquisition Reference Design for Maximum SNR (Rev. A)
(PDF 4088 KB)
01 Apr 2016
- TIDA-00732 Schematic and Block Diagram (Rev. A)
(PDF 3438 KB)
03 Jun 2016
Description
This “18-bit, 2-Msps Isolated Data Acquisition Reference Design to achieve maximum SNR and sampling rate” illustrates how to overcome performance-limiting challenges typical of isolated data acquisition system design:
- Maximizing sampling rate by minimizing propagation delay introduced by digital isolator
- Maximizing high-frequency AC signal chain performance (SNR) by effectively mitigating ADC sampling clock jitter introduced by the digital isolator
Features
- 18-Bit, 2Msps, 1-Ch, differential input, isolated data acquisition (DAQ) system
- Leverages multiSPI™ digital interface of ADS9110 to achieve 2MSPS sampling rate while maintaining a low SPI data rate
- Source synchronous SPI data transfer mode to minimize isolator propagation delay and improve sampling rate
- Techniques to reduce Isolator-induced jitter resulting in 12dB improvement in SNR (100kHz Fin, 2-MSPS)
- Tested design includes theory and calculations, component selection, PCB design, and measurement results
See the Important Notice and Disclaimer covering reference designs and other TI resources.