The AMC131M03 is a precision, three-channel, data- and power-isolated, simultaneous-sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC).

The AMC131M03 offers wide dynamic range, low power, and energy-measurement-specific features, making the device designed for energy metering and power metrology applications. The ADC inputs can be directly interfaced to a resistor-divider network or a shunt current sensor because of the device high-input impedance.

The AMC131M03 features 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, making the AMC131M03 an excellent choice for polyphase energy metering applications using shunt current sensors.

The three isolated, simultaneous-sampling ΔΣ ADC channels feature differential inputs and a single-supply operation (3.3V or 5V) with an integrated DC/DC converter in the temperature range: –40°C to +125°C. The device was optimized for low EMI and meets CISPR-11 and CISPR-25 standards and has the safety-related certifications: – 7070V_PEAK reinforced isolation per DIN EN IEC 60747-17 (VDE 0884-17): 2021-10 as well as 5000V_RMS isolation for 1 minute per UL1577.

The programmable data rate is a maximum 64ksps and the programmable gain up to 128, a low-drift internal voltage reference and an internal temperature sensor are included. Data and registers are being accessed through a 4-wire SPI with cyclic redundancy check (CRC).

If the 3rd input channel is not required (for example, for a temperature measurement with the 1%, 100kΩ linear thermistor TMP63), the very similar AMC131M02 2-channel device can be a used as a cost-effective alternative.