7 Detailed Description

7.1 Overview

The AMC0x00D is a precision, galvanically isolated amplifier with a ±250mV, differential input and differential

output. 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. This differential output signal is 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 note. The digital modulation used in the AMC0x00D

transmits data across the isolation barrier. This modulation, and the isolation barrier characteristics, result in high

reliability and high common-mode transient immunity.

7.2 Functional Block Diagram

VDD2

OUTP

OUTN

GND2

GND1

INP

INN

VDD1

Analog Filter

ΔΣ Modulator

Reference

20 MHz Oscillator

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AMC0200D, AMC0300D

SBASAR7 – SEPTEMBER 2025

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Product Folder Links: AMC0200D AMC0300D