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- AFE Using High-Speed ADC and Differential Amp for Digital Fault Recorder or TWFL (Rev. A)
(PDF 5184 KB)
25 Oct 2016 357 views
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.
- 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