The AMC1311 is a precision, single-ended input, isolated amplifier with a high input impedance and wide input voltage range. The input stage of the device drives a second-order, delta-sigma (ΔΣ) modulator. The modulator converts the analog input signal into a digital bitstream that is transferred across the isolation barrier and separates the high-side from the low-side. On the low-side, the received bitstream is processed by a fourth-order analog filter that outputs a differential signal at the OUTP and OUTN pins proportional to the input signal.

The SiO₂-based, capacitive isolation barrier supports a high level of magnetic field immunity, as described in the ISO72x Digital Isolator Magnetic-Field Immunity application report. The digital modulation used in the AMC1311 to transmit data across the isolation barrier, and the isolation barrier characteristics itself, result in high reliability and high common-mode transient immunity.