7 Detailed Description

7.1 Overview

The AMC1202 is a fully differential, precision, isolated amplifier. 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 that is proportional to the input signal.

ISO72x Digital Isolator Magnetic-Field Immunity application report. The digital modulation used in the AMC1202

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

AMC1202

ΔΣ Modulator

GND1

INP

INN

VDD1

Diagnostics

VDD2

OUTP

OUTN

GND2

Analog Filter

7.3 Feature Description

7.3.1 Analog Input

The differential amplifier input stage of the AMC1202 feeds a second-order, switched-capacitor, feed-forward

ΔΣ modulator. The gain of the differential amplifier is set by internal precision resistors with a differential input

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.

www.ti.com

AMC1202

SBASAB8 – MAY 2021

Copyright © 2021 Texas Instruments Incorporated

Submit Document Feedback

17

Product Folder Links: AMC1202