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 5700Vrms Insulation Voltage
• Clock frequency: 5MHz to 21MHz
• ±50mV or ±250mV Linear Input Voltage Range
• Excellent DC Performance:
○ Offset Error: ±50μV or ±100μV (Max)
○ Offset Drift: -1~1μV/°C (Max)
○ Gain Error: ±0.2% (Max)
○ Gain Drift: ±40ppm/°C (Max)
• SNR: 82.5dB or 86dB (Typ)
• High CMTI: 150kV/μs (Typ)
• System-Level Diagnostic Features:
○ AVDD monitoring
○ Input common-mode overvoltage detection
• Operation Temperature: -40°C~125°C
• RoHS-Compliant Packages:
○ SOW8 wide body (SOP8 300mil)
○ SOW16 wide body (SOP16 300mil)
Safety Certificate
• UL recognition per UL1577
• CQC certification per GB4943.1
• CSA component notice 5A
• DIN EN IEC 60747-17 (VDE 0884-17)
Application
• Shunt Current Monitoring
• AC Motor Controls
• Power and Solar Inverters
• Uninterruptible Power Suppliers
• Automotive Onboard Chargers
Functional Block Diagram
For more product information, please contact us.
