Isolation

Barrier

û-Modulator

RX

2.5-V

Reference

VOUTP

VOUTN

VDD2

GND2

GND1

VINP

VINN

VDD1

RC oscillator

RX

TX

TX

Retiming and

3

rd order

active

low-pass filter

DATA

CLK

2.56-V

Reference

AMC1200, AMC1200B

www.ti.com

SBAS542D – APRIL 2011 – REVISED JULY 2015

7 Detailed Description

7.1 Overview

The AMC1200 is a fully-differential precision isolation amplifier. The analog input signal is converted to a digital

signal and then transferred across a capacitive isolation barrier. The digital modulation used in the AMC1200

together with the isolation barrier characteristics result in excellent reliability and transient immunity.

After processing the digital signal with a low-pass filter, an analog signal is provided at the outputs. The main

building blocks are shown in the Functional Block Diagram section.

The SiO2-based capacitive isolation barrier supports a high level of magnetic field immunity, as described in

application report, ISO72x Digital Isolator Magnetic-Field Immunity (SLLA181), available for download at

www.ti.com.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Insulation Characteristics

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Maximum working

VIORM

1200

VPEAK

insulation voltage

Qualification test: after Input/Output Safety Test

Subgroup 2/3 VPR = VIORM × 1.2, t = 10 s, partial

1140

VPEAK

discharge < 5 pC

Qualification test: method a, after environmental tests

VPR

Input to output test voltage

subgroup 1, VPR = VIORM × 1.6, t = 10 s, partial

1920

VPEAK

discharge < 5 pC

100% production test: method b1, VPR = VIORM x 1.875,

2250

VPEAK

t = 1 s, partial discharge < 5 pC

AMC1200

4000

VPEAK

VIOTM

Transient overvoltage

Qualification test: t = 60 s

AMC1200B

4250

VPEAK

AMC1200

4000

VPEAK

Qualification test: VTEST = VISO,

t = 60 s

AMC1200B

4250

VPEAK

VISO

Insulation voltage per UL

AMC1200

4800

VPEAK

100% production test: VTEST =

1.2 x VISO, t = 1 s

AMC1200B

5100

VPEAK

RS

Insulation resistance

VIO = 500 V at TS

> 109

Ω

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