Transient and Digital Fault Recorder AFE Using Differential Amplifiers and HS ADC Reference Design
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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| ADC3421 |
Quad-channel 12-bit 25-MSPS analog-to-digital converter (ADC) |
Analog-to-digital converters (ADCs) |
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| ADC3441 |
Quad-Channel, 14-Bit, 25-MSPS Analog-to-Digital Converter (ADC) |
Analog-to-digital converters (ADCs) |
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| ADS7254 |
12 Bit, 1 MSPS, Dual, Simultaneous Sampling Differential SAR ADC |
Analog-to-digital converters (ADCs) |
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| ADS7854 |
SAR ADC, dual, differential input, 1 MSPS, 14-bit, simultaneous sampling |
Analog-to-digital converters (ADCs) |
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| ADS8354 |
Dual 700kSPS 16-Bit Simultaneous-Sampling SAR Analog-to-Digital Converter (ADC) |
Analog-to-digital converters (ADCs) |
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| LM4140 |
0.1% 3-ppm/°C precision micropower low-dropout series voltage reference with enable pin |
Voltage references |
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| OPA322 |
20MHz Low-Noise 1.8V RRIO CMOS Operational Amplifier With Shutdown |
Operational amplifiers (op amps) |
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| REF5025 |
2.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference |
Voltage references |
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| THS4521 |
Very low power rail-to-rail output fully differential amplifier |
Amplifiers |
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| THS4531 |
Ultra low power 0.25mA, RRO, fully differential amplifier |
Amplifiers |
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| TPS62080 |
1.2A High Efficient Step Down Converter in 2x2mm SON Package, with Adjustable Vout |
Step-down (buck) regulators |
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Technical documentation
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User guides (2)
| | PDF | 5184 |
25 Oct 2016
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| | PDF | 9506 |
03 Apr 2014
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Design files (7)
| | ZIP | 4384 |
26 Oct 2015
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| | ZIP | 1015 |
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