TIDA-00499

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

TIDA-00499

Design files

Overview

While Digital Fault Recorders (DFRs) 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 reference design demonstrates the capturing of transient inputs at up to 1 MHz for DFR and 25 MHz for transient tecorders. Both positive and negative transients (<=2-kV peak) can be captured with varying resolution based on application need (12-bit to 14-bit resolution) and within 10% accuracy using a differential amplifier driving a high-speed converter.

Features
  • Transient recording from 10 MHz to 25 Mhz (> 166,000 samples/cycle)
  • DFR 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% to 100% of input voltage range): ±20 V (resolution) for 2-kV peak
  • Measurement accuracy (10% to 100% of input voltage range): < 10%  for transient capture and < 1% for DFR
  • Tested for surge immunity as per IEC61000-4-5 up to 4 kV with 42-Ω impedance
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUAT7A.PDF (5184 K)

Reference design overview and verified performance test data

TIDRII7.ZIP (1015 K)

Detailed schematic diagram for design layout and components

TIDRII8.ZIP (388 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRII9.ZIP (289 K)

Detailed overview of design layout for component placement

TIDRIJ2.ZIP (10108 K)

Files used for 3D models or 2D drawings of IC components

TIDCBB6.ZIP (4384 K)

Design file that contains information on physical board layer of design PCB

TIDRIJ0.ZIP (2806 K)

PCB layer plot file used for generating PCB design layout

TIDRIJ1.ZIP (829 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

High-speed ADCs (≥10 MSPS)

ADC3421Quad-channel 12-bit 25-MSPS analog-to-digital converter (ADC)

Data sheet: PDF | HTML
High-speed ADCs (≥10 MSPS)

ADC3441Quad-Channel, 14-Bit, 25-MSPS Analog-to-Digital Converter (ADC)

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS620801.2A High Efficient Step Down Converter in 2x2mm SON Package, with Adjustable Vout

Data sheet: PDF | HTML
Fully differential amplifiers

THS4521Very low power rail-to-rail output fully differential amplifier

Data sheet: PDF | HTML
Fully differential amplifiers

THS4531Ultra low power 0.25mA, RRO, fully differential amplifier

Data sheet: PDF | HTML
General-purpose op amps

OPA322Single, 5.5-V, 20-MHz, 65-mA output current, low noise (8.5-nV/√Hz) operational amplifier

Data sheet: PDF | HTML
Precision ADCs

ADS725412 Bit, 1 MSPS, Dual, Simultaneous Sampling Differential SAR ADC

Data sheet: PDF | HTML
Precision ADCs

ADS7854SAR ADC, dual, differential input, 1 MSPS, 14-bit, simultaneous sampling

Data sheet: PDF | HTML
Precision ADCs

ADS8354Dual 700kSPS 16-Bit Simultaneous-Sampling SAR Analog-to-Digital Converter (ADC)

Data sheet: PDF | HTML
Series voltage references

LM41400.1% 3-ppm/°C precision micropower low-dropout series voltage reference with enable pin

Data sheet: PDF | HTML
Series voltage references

REF50252.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

Data sheet: PDF | HTML

Technical documentation

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* Design guide AFE Using High-Speed ADC and Differential Amp for Digital Fault Recorder or TWFL (Rev. A) Oct. 25, 2016

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