ACPL-782T

Automotive Isolation Amplifier

Data Sheet

CAUTION: It is advised that normal static precautions be taken in handling and assembly

of this component to prevent damage and/or degradation which may be induced by ESD.

Description

The ACPL-782T isolation amplifier was designed for

voltage and current sensing in electronic motor drives

and battery system monitoring. In a typical implementa-

tion, and motor currents flow through an external resistor

and the resulting analog voltage drop is sensed by the

ACPL-782T. A differential output voltage is created on the

other side of the ACPL-782T optical isolation barrier. This

differential output voltage is proportional to the motor

current and can be converted to a single-ended signal

by using an op-amp as shown in the recommended ap-

plication circuit. Since common-mode voltage swings

of several hundred volts in tens of nanoseconds are

common in modern switching inverter motor drives, the

ACPL-782T was designed to ignore very high common-

mode transient slew rates (of at least 10 kV/

Ps).

The high CMR capability of the ACPL-782T isolation

amplifier provides the precision and stability needed to ac-

curately monitor motor current and DC rail voltage in high

noise motor control environments, providing for smoother

control(less“torqueripple”)invarioustypesofmotorcontrol

applications.

The product can also be used for general analog signal

isolation applications requiring high accuracy, stability,

and linearity under similarly severe noise conditions. The

ACPL-782T utilizes sigma delta (

6') analog-to-digital

converter technology, chopper stabilized amplifiers, and

a fully differential circuit topology.

Together, these features deliver unequaled isolation-

mode noise rejection, as well as excellent offset and

gain accuracy and stability over time and temperature.

This performance is delivered in a compact, auto-insert-

able, industry standard 8-pin DIP package that meets

worldwide regulatory safety standards. (A gull-wing

surface mount option -300E is also available).

forced insulation and reliability needed for critical in auto-

motive and high temperature industrial applications.

Features

x ±2% Gain Tolerance @ 25°C

x 30ppm/°C Gain Drift vs. Temperature

x 0.3 mV Input Offset Voltage

x 100 kHz Bandwidth

x 0.004% Nonlinearity

x Compact, Auto-Insertable Standard 8-pin DIP Package

x Worldwide Safety Approval:

– CSA

– IEC 60747-5-5, DIN EN 60747-5-2(VDE 0884 Teil 2)

x Qualified to AEC-Q100 Test Guidelines

x Automotive Operating Temperature -40 to 125°C

x Advanced Sigma-Delta (6') A/D Converter Technology

x Fully Differential Circuit Topology

Applications

x Automotive Motor Inverter Current/Voltage Sensing

x Automotive AC/DC and DC/DC converter Current/

Voltage sensing

x Automotive Battery ECU

x Automotive Motor Phase Current Sensing

x Isolation Interface for Temperature Sensing

x General Purpose Current Sensing and Monitoring

Functional Diagram

Lead (Pb) Free

RoHS 6 fully

compliant

RoHS 6 fully compliant options available;

-xxxE denotes a lead-free product

The connection of a 0.1

PF bypass capacitor between

pins 1 and 4, pins 5 and 8 is recommended.

1

2

3

4

8

7

6

5

GND1

GND2

+

-

+

-

SHIELD