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Isolated Current Sampling ADC with High Reliability
The NSI1305 is a high performance Σ-Δ modulator with output separated from input based on the NOVOSENSE capacitive isolation technology. The device has a linear differential input signal range of ±50mV (±64mV full-scale) or ±250mV (±320mV full-scale). The differential input is ideally suited to shunt resistor-based current sensing in high voltage applications where isolation is required.
The analog input is amplified and continuously sampled by a second-order Σ-Δ modulator and converted to a high speed, single bit data stream. The output data is synchronous to the external clock with a frequency range from 5MHz to 21MHz. By using an appropriate digital filter (such as sinc3 filter) to decimate the bitstream, the device can achieve 16 bits resolution and an 86dB/82.5dB signal to noise ratio (SNR) at 78.125kSPS with a 20MHz master clock.
The fail-safe functions including input common-mode overvoltage detection and missing AVDD detection simplify system-level design and diagnostics.
Product Features
• Up to 5000VRMS Insulation Voltage
• Clock frequency: 5MHz to 21MHz
• ±50mV or ±250mV Linear Input Voltage Range
• Excellent DC performance:
• ±50mV or ±250mV Linear Input Voltage Range
• Offset Drift: -0.5~1.5μV/℃ (Max)
• Gain Error: ±0.2% (Max)
• Gain Drift: ±40ppm/℃ (Max)
• SNR: 82.5dB or 86dB (Typ)
• High CMTI: 150kV/μs (Typ)
• System-level diagnostic functions:
• AVDD monitoring
• Input common-mode overvoltage detection
• Operating temperature: -40℃~125℃
• Package: SOP8(300mil)/SOP16(300mil)
Safety Certificate
• UL recognition: up to 5000Vrms for 1 minute per UL1577
• CQC certification per GB4943.1-2011
• CSA component notice 5A approval IEC60950-1 standard
• DIN VDE V 0884-11:2017-01
Application
• Shunt current monitoring
• AC motor controls
• Power and solar inverters
• Uninterruptible Power Suppliers
• Automotive onboard chargers
Functional Block Diagram
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