High Reliability Reinforced Isolated Sigma-Delta Modulator with LVDS Interface
The NSI1305L25 is a high reliability reinforced isolated Σ-Δ modulator with LVDS digital interface. The device has a linear differential input signal range of ±250mV. 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. Both the input clock and the output data are LVDS interface conformed to TIA/EIA-644-A LVDS Standard. 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
• ±250mV Linear Input Voltage Range
• Low voltage differential signaling interface
• Excellent DC Performance:
◦ Offset Error: ±100μV (Max)
◦ Offset Drift: -1.3~1.3μV/°C (Max)
◦ Gain Error: ±0.2% (Max)
◦ Gain Drift: ±40ppm/°C (Max)
• SNR: 86dB (Typ)
• High CMTI: 150kV/μs (Typ)
• Conforms to TIA/EIA-644-A LVDS Standard
• System-Level Diagnostic Features:
◦ AVDD monitoring:
◦ Input common-mode overvoltage detection
• Operation Temperature: -40°C~125°C
• RoHS-Compliant Package: 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
• Industrial Motor Drives
• Power and solar inverters
• Uninterruptible Power Suppliers
Functional Block Diagram
For more product information, please contact us.
