16-Bit 1-MSPS Data Acquisition Reference Design, Isolated for High-Voltage Common-Mode Rejection
TIDA-00106
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Key Document
- Data Acquisition System for High-Voltage Common Mode Rejection Design Guide
(PDF 4826 KB)
01 Mar 2016
Description
The circuit represents a high-performance data acquisition (DAQ) solution suitable for processing input signals (up to ±12 V) superimposed on large common-mode offsets (tested up to 155 Vp-p from dc to approximately 15 kHz) relative to the ground potential of the system's main power supply. Common-mode rejection is achieved by generating an isolated power supply to allow the analog signal chain to float with the input common-mode signal. The analog signal chain consists of a high-performance, 16-bit, 1-MSPS SAR ADC with an integrated analog front end (AFE) that offers high input impedance and a wide ±12-V input voltage range. Relevant application areas include PLC analog input modules with channel-to-channel isolation, automotive battery pack monitoring, power monitoring in AC motor drives and thermocouple measurements.
Features
- Provides 16-bit, 1-MSPS, 120-dB CMRR, 108-dB THD, performance via Isolation
- Isolated data acquisition to allow for high-voltage common-mode rejection
- Isolated power supply design
- Design facilitates injecting high common-mode voltages for testing
See the Important Notice and Disclaimer covering reference designs and other TI resources.