7 Detailed Description

7.1 Overview

The AMC1350 is a fully differential, precision, isolated amplifier with high input impedance. The input stage

of the device consists of a fully differential amplifier that 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.

ISO72x Digital Isolator Magnetic-Field Immunity application report. The digital modulation used in the AMC1350

to transmit data across the isolation barrier, and the isolation barrier characteristics itself, result in high reliability

and common-mode transient immunity.

7.2 Functional Block Diagram

AMC1350

ΔΣ Modulator

GND1

INP

INN

VDD1

Diagnostics

VDD2

OUTP

OUTN

GND2

Analog Filter

7.3 Feature Description

7.3.1 Analog Input

The single-ended, high-impedance input stage of the AMC1350 feeds a second-order, switched-capacitor, feed-

forward ΔΣ modulator. The modulator converts the analog signal into a bitstream that is transferred across the

isolation barrier, as described in the Isolation Channel Signal Transmission section.

exceed the range specified in the Absolute Maximum Ratings table, the input currents must be limited to the

absolute maximum value because the electrostatic discharge (ESD) protection turns on. In addition, the linearity

and parametric performance of the device are ensured only when the analog input voltage remains within

Recommended Operating Conditions table.

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AMC1350

SBASAA6 – AUGUST 2021

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