High Reliability Isolated Sigma-Delta Modulator with Internal Clock
The NSI1303M21 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 ±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 bit-stream of the NSI1303M21 is synchronized to the internally generated clock. NSI1303M21 can achieve 16 bits resolution and an 85dB (typ) signal to noise ratio (SNR) at 78.125kSPS by using an appropriate digital filter (such as sinc3 filter). 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
10MHz internal clock frequency
±50mV or ±250mV Linear Input Voltage Range
Excellent DC Performance:
Offset Error: ±100μV (Max)
Offset Drift: ±1μV/℃ (Max)
Gain Error: ±0.2% (Max)
Gain Drift: ±40ppm/℃ (Max)
High CMTI: 150kV/μs (Typ)
System-Level Diagnostic Features: AVDD monitoring; Input common-mode overvoltage detection
Operation Temperature: -40℃~125℃
RoHS-Compliant Packages: 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
DIN EN IEC 60747-17 (VDE 0884-17)
Application
Shunt current monitoring
AC motor controls
Uninterruptible Power Suppliers
Automotive onboard chargers
Functional Block Diagram
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