The ADS131M02 device is a two-channel, simultaneously-sampling, 24-bit, 2nd-order delta-sigma (ΔΣ), analog-to-digital converter (ADC) that offers wide dynamic range, and internal calibration features making the device well-designed for energy metering, power quality, and protection applications. The ADC inputs can be directly interfaced to a resistor-divider network, a transformer to measure voltage or current, or a Rogowski coil to measure current.

The individual ADC channels can be independently configured depending on the sensor input. A low-noise, programmable gain amplifier (PGA) provides gains ranging from 1 to 128 to amplify low-level signals. Additionally, these devices integrate channel-to-channel phase alignment and offset and gain calibration registers to help remove signal chain errors. A low-drift, 1.2V reference is integrated into the device reducing printed circuit board (PCB) area. cyclic redundancy check (CRC) options can be individually enabled on the data input, data output, and register map to provide communication integrity. Figure 2-7 shows a block diagram of this device.