AMC3306M25

• 3.3-V or 5-V single supply with integrated DC/DC converter
• ±250-mV input voltage range optimized for current measurement using shunt resistors
• Low DC errors:
  • Offset error: ±50 µV (max)
  • Offset drift: ±1 µV/°C (max)
  • Gain error: ±0.2% (max)
  • Gain drift: ±35 ppm/°C (max)
• High CMTI: 75 kV/µs (min)
• System-level diagnostic features
• Low EMI: Meets CISPR-11 and CISPR-25 standards
• Safety-related certifications:
  • 6000-V_PEAK 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

The AMC3306M25 is a precision, isolated delta-sigma (ΔΣ) modulator, 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 AMC3306M25 is optimized for direct connection to a low-impedance shunt resistor or other, low-impedance voltage sources with low signal levels. The excellent DC accuracy and low temperature drift support accurate current measurements over the extended industrial temperature range from –40°C to +125°C.

By using a digital filter (such as a sinc³ filter) to decimate the bitstream, the device can achieve 16 bits of resolution with a dynamic range of 85 dB at a data rate of 78 kSPS.