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HCPL-7840

Analog Isolation Amplifier

HP => Agilent Technologies 

Analog Isolation Amplifier

Technical Data

H

HCPL-7840

Features

• High Common Mode

Rejection (CMR): 15 kV/µs

at VCM = 1000 V

• 5% Gain Tolerance

• 0.1% Nonlinearity

• Low Offset Voltage and Off-

set Temperature Coefficient

• 100 kHz Bandwidth

• Performance Specified Over

-40°C to 85°C Temperature

Range

• Recognized Under UL 1577

and CSA Approved for

Dielectric Withstand Proof

Test Voltage of 2500 Vac, 1

Minute

• Standard 8-Pin DIP Package

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

Description

The HCPL-7840 isolation ampli-

fier provides accurate, electrically

isolated and amplified representa-

tions of voltage and current.

When used with a shunt resistor

in the current path, the HCPL-

7840 offers superior reliability,

cost effectiveness, size and

autoinsertability compared with

the traditional solutions such as

current transformers and Hall-

effect sensors.

The HCPL-7840 consists of a

sigma-delta analog-to-digital

converter optically coupled to a

digital-to-analog converter.

Superior performance in design

critical specifications such as

common-mode rejection, offset

voltage, nonlinearity, operating

temperature range and regulatory

compliance make the HCPL-7840

the clear choice for designing

reliable, lower-cost, reduced-size

products such as motor

controllers and inverters.

environments such as those

generated by the high switching

rates of power IGBTs.

Low offset voltage together with

a low offset voltage temperature

coefficient permits accurate use

of auto-calibration techniques.

Gain tolerance of 5% with 0.1%

nonlinearity further provide the

performance necessary for

accurate feedback and control.

A wide operating temperature

range with specified performance

allows the HCPL-7840 to be used

in hostile industrial environments.

Functional Diagram

IDD1

VDD1 1

IDD2

8 VDD2

VIN+ 2

+

VIN– 3

–

+

7 VOUT+

–

6 VOUT–

GND1 4

SHIELD

5 GND2

Common-mode rejection of

15 kV/µs makes the HCPL-7840

suitable for noisy electrical

A 0.1 F bypass capacitor must be connected between pins 1 and 4 and between pins 5 and 8.

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.

1-248

5965-4784E

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