TI AMC3301DWER

The AMC3301 is a precision isolated amplifier optimized for shunt-based current measurement. This fully integrated isolated DC/DC converter enables single-supply operation on the low side of the device, making it a unique solution for space-constrained applications. The enhanced capacitive isolation barrier is certified to VDE V 0884-11 and UL1577 and supports an operating voltage of up to 1.2 kVRMS. This isolation barrier can separate devices operating at different common-mode voltage levels in the system and protect low-voltage devices from high-voltage surges. The input of the AMC3301 is optimized for direct connection to low-impedance shunt resistors or other low-impedance voltage sources with low signal levels. Excellent DC accuracy and low temperature drift support accurate current measurement over the industrial operating temperature range of –40°C to +125°C. The integrated DC/DC converter fault detection and diagnostic output pins of the AMC3301 simplify system-level design and diagnostics.

• 3.3V or 5V single supply with integrated DC/DC converter, ±250mV input voltage range, optimized for current measurement using shunt resistors
• Fixed gain: 8.2
• Low DC error:
  • Offset voltage: ±150μV (max), tempco: ±1μV/°C (max)
  • Gain error: ±0.2% (max)
  • Gain error drift: ±40ppm/°C (max)
• Nonlinearity: ±0.04% (max)
• High CMTI: 85kV/μs (min)
• System-level diagnostic features
• Compliant with CISPR-11 and CISPR-25 EMI standards
• Safety-related certifications:
  • 6000Vpk reinforced isolation per DIN VDE V 0884-11
  • 4250VRMS isolation for 1 minute per UL1577
• Operating over industrial temperature range: -40°C to +125°C

• Shunt-based isolated current sensing for:
  • Protection relays
  • Motor drives
  • Power supplies
  • Photovoltaic inverters