TX

Retiming and

4

active

low-pass filter

û -Modulator

Bandgap

Reference

OUTP

OUTN

GND1

AMC1302

RX

RX

TX

Data

CLK

VDD2

GND2

Bandgap

Reference

Oscillator

INP

INN

Reinforced

Isolation

Barrier

Diagnostic

VDD1

VDD1

Detection

11

AMC1302

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SBAS812 – JUNE 2018

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7 Detailed Description

7.1 Overview

The AMC1302 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 uses the internal

voltage reference and clock generator to convert the analog input signal to a digital bitstream. The drivers (called

TX in the Functional Block Diagram) transfer the output of the modulator across the isolation barrier that

separates the high-side and low-side voltage domains. The received bitstream and clock are synchronized and

processed by a fourth-order analog filter on the low-side and presented as a differential output of the device.

in ISO72x Digital Isolator Magnetic-Field Immunity. The digital modulation used in the AMC1302 (see also the

Isolation Channel Signal Transmission section for more details) and the isolation barrier characteristics result in

high reliability and common-mode transient immunity.

7.2 Functional Block Diagram