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
• Safety-related certifications:
  • 6000-V_PEAK reinforced isolation per DIN VDE V 0884-11
  • 4250-V_RMS isolation for 1 minute per UL1577
• Meets CISPR-11 and CISPR-25 EMI standards

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The AMC3306M25 is a precision, delta-sigma (ΔΣ) modulator, optimized for shunt-based current measurements, with a fully integrated isolated DC/DC converter that allows single-supply operation from the low-side of the device. The reinforced capacitive isolation barrier is certified according to VDE V 0884-11 and UL1577. This isolation barrier separates parts of the system that operate on different common-mode voltage levels and protects lower-voltage parts from damage.

The input of the AMC3306M25 is optimized for direct connection to shunt resistors or other, low voltage-level signal sources. The integrated isolated DC/DC converter allows unconstrained placement of the shunt, independent of any high-side supply that is usually required to power the isolated modulator, and makes the device a unique solution for space-constrained applications.

The device supports excellent AC and DC performance over its linear input voltage range of ±250 mV. By using a digital filter or delta-sigma-filter module (such as those integrated in the TMS320F2807x or TMS320F2837x microcontroller families) 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.

The AMC3306M25 is fully specified over the extended industrial temperature range of –40°C to +125°C.