18-bit, 2-Msps Isolated Data Acquisition Reference Design to Achieve Maximum SNR and Sampling Rate
TIDA-00732
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
See the Important Notice and Disclaimer covering reference designs and other TI resources.
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.
