Datasheet > A7840

A7840

更新时间： 2024-11-26 05:34:39

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A7840 数据手册

Isolation Amplifier

Technical Data

HCPL-7840

Features

• 15 kV/µs Common-Mode

Rejection at V_CM= 1000 V

• Compact, Auto-Insertable

Standard 8-pin DIP Package

• 0.00025 V/V/°C Gain Drift vs.

Temperature

• 0.3 mV Input Offset Voltage

• 100 kHz Bandwidth

• 0.004% Nonlinearity

• Worldwide Safety Approval:

UL 1577 (3750 Vrms/1 min.)

and CSA (pending), VDE

0884 (Option #060 only)

• Advanced Sigma-Delta (Σ−∆)

A/D Converter Technology

• Fully Differential Circuit

Topology

• 0.8 µm CMOS IC Technology

Description

ments, providing for smoother

control (less “torque ripple”) in

various types of motor control

applications.

The HCPL-7840 isolation amplifier

family was designed for current

sensing in electronic motor drives.

In a typical implementation, motor

currents flow through an external

resistor and the resulting analog

voltage drop is sensed by the

HCPL-7840. A differential output

voltage is created on the other

side of the HCPL-7840 optical

isolation barrier. This differential

output voltage is proportional to

the motor current and can be con-

verted to a single-ended signal by

using an op-amp as shown in the

recommended application circuit.

Since common-mode voltage

swings of several hundred volts in

tens of nanoseconds are common

in modern switching inverter

motor drives, the HCPL-7840

was designed to ignore very high

common-mode transient slew

rates (of at least 10 kV/µs).

Functional Diagram

DD2

DD1

DD2

IN+

OUT+

–

IN–

–

OUT–

GND1

GND2

SHIELD

The product can also be used for

general analog signal isolation

applications requiring high

Applications

• Motor Phase and Rail

Current Sensing

• Inverter Current Sensing

• Switched Mode Power

Supply Signal Isolation

• General Purpose Current

Sensing and Monitoring

• General Purpose Analog

Signal Isolation

accuracy, stability, and linearity

under similarly severe noise con-

ditions. For general applications,

we recommend the HCPL-7840

(gain tolerance of ± 5%). The

HCPL-7840 utilizes sigma delta

(∑-∆) analog-to-digital converter

technology, chopper stabilized

amplifiers, and a fully differential

circuit topology fabricated using

The high CMR capability of the

HCPL-7840 isolation amplifier

provides the precision and

stability needed to accurately

monitor motor current in high

noise motor control environ-

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.

12 3 4 5 6 7...19

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