The AMC3311 is a precision, single-ended, isolated amplifier with high input impedance, wide input voltage range, and an integrated DC/DC converter that allows the device to be supplied from a single 3.3-V or 5-V voltage source on the low side. 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 that 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.

A block diagram of the AMC3311 is shown in the Functional Block Diagram. The 1-GΩ input impedance of the analog input stage supports low gain-error signal-sensing in high-voltage applications using high-impedance resistive dividers.

The signal path is isolated by a double capacitive silicon-dioxide (SiO₂) insulation barrier, whereas power isolation uses an on-chip transformer separated by a thin-film polymer as the insulating material.