Transient and Digital Fault Recorder AFE Using Differential Amplifiers and HS ADC Reference Design

(ACTIVE) TIDA-00499

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Key Document

Description

While Digital Fault Recorders (DFR) can detect transients in 17/20 μs at 60/50 Hz, Transient Recorders capture disturbances that can peak and decay well within a microsecond. This TI Design demonstrates the capturing of transient inputs at up to 1 MHz for Digital Fault Recorder and 25 MHz for Transient Recorders. Both positive and negative transients (<=2kV peak) can be captured with varying resolution based on application need (12-14 bit resolution) and within 10% accuracy using a differential amplifier driving a high speed converter.

Features
  • Transient Recording from 10MHz - 25Mhz (> 166,000 samples/cycle)
  • Digital Fault Recording of up to 1 MHz
  • Differential amplifier front end to interface transient inputs to differential ADC
  • Measurement Range: Capture input transient from 250 V to 2 kV peak, 1.2/50 us
  • Measurement Sensitivity (10% - 100% of input voltage range): ±20 V (Resolution) for 2 kV peak
  • Measurement Accuracy (10% - 100% of input voltage range): < 10%  for Transient Capture and < 1% for Digital Fault Recorder
  • Tested for Surge Immunity as per IEC61000-4-5 up to 4kV with 42Ω impedance

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TI Devices (11)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADC3421  Quad-Channel, 12-Bit, 25-MSPS Analog-to-Digital Converter (ADC)  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADC3441  Quad-Channel, 14-Bit, 25-MSPS Analog-to-Digital Converter (ADC)  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS7254  SAR ADC, Dual, 1 MSPS, 12 Bit, Simultaneous Sampling  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS7854  SAR ADC, Dual, 1 MSPS, 14 Bit, Simultaneous Sampling  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS8354  SAR ADC, Dual, 700 kSPS, 16 Bit, Simultaneous Sampling  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
LM4140  Precision Micropower Low Dropout Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
OPA322  20MHz Low-Noise 1.8V RRIO CMOS Operational Amplifier With Shutdown  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF5025  3 µVpp/V Noise, 3 ppm/°C Drift Precision Series Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
THS4521  Very low power rail-to-rail output fully differential amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
THS4531  Ultra low power 0.25mA, RRO, fully differential amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS62080  1.2A High Efficient Step Down Converter in 2x2mm SON Package, with Adjustable Vout  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS7254 Download Download
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ADS7854 Download
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ADS8354 Download Download
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LM4140 Download Download
OPA322 Download Download
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REF5025 Download Download
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THS4521 Download Download
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THS4531 Download
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TPS62080 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (2)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 5184 25 Oct 2016 28
PDF 9506 03 Apr 2014 55
Design files (7)
Title Abstract Type Size (KB) Date Views
ZIP 4384 26 Oct 2015 17
ZIP 10108 26 Oct 2015 13
ZIP 829 26 Oct 2015 9
ZIP 2806 26 Oct 2015 15
ZIP 289 26 Oct 2015 11
ZIP 388 26 Oct 2015 13
ZIP 1015 26 Oct 2015 36

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