AMC3302

• 3.3-V or 5-V single supply with integrated DC/DC converter
• ±50-mV input voltage range optimized for current measurement using shunt resistors
• Fixed gain: 41
• Low DC errors:
  • Offset voltage: ±50 µV (max)
  • Offset drift: ±0.5 µV/°C (max)
  • Gain error: ±0.2% (max)
  • Gain error drift: ±35 ppm/°C (max)
  • Nonlinearity: ±0.03% (max)
• High CMTI: 85 kV/µs (min)
• System-level diagnostic features
• Meets CISPR-11 and CISPR-25 EMI standards
• Safety-related certifications:
  • 6000-V_PK reinforced isolation per DIN VDE V 0884-11
  • 4250-V_RMS isolation for 1 minute per UL1577
• Fully specified over the extended industrial temperature range: –40°C to +125°C

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The AMC3302 is a precision, isolated amplifier optimized for shunt-based current measurements. The fully integrated, isolated DC/DC converter allows single-supply operation from the low-side of the device, which makes the device a unique solution for space-constrained applications. The reinforced capacitive isolation barrier is certified according to VDE V 0884-11 and UL1577 and supports a working voltage of up to 1.2 kV_RMS.

The isolation barrier separates parts of the system that operate on different common-mode voltage levels and protects the low-voltage side from hazardous voltages and damage.

The input of the AMC3302 is optimized for direct connection to a low-impedance shunt resistor or another low-impedance voltage source with low signal levels. The excellent DC accuracy and low temperature drift supports accurate current measurements over the extended industrial temperature range from –40°C to +125°C.

The integrated DC/DC converter fault-detection and diagnostic output pin of the AMC3302 simplify system-level design and diagnostics.