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H

High CMR Isolation Amplifiers

Technical Data

HCPL-7800

HCPL-7800A

HCPL-7800B

applications, we recommend the

HCPL-7800 which exhibits a

part-to-part gain tolerance of

± 5%. For precision applications,

HP offers the HCPL-7800A and

HCPL-7800B, each with part-to-

part gain tolerances of

± 1%.

The HCPL-7800 utilizes sigma-

delta (

Σ∆) analog-to-digital

converter technology, chopper

stabilized amplifiers, and a fully

differential circuit topology

fabricated using HP’s 1

µm

CMOS IC process. The part also

couples our high-efficiency, high-

speed AlGaAs LED to a high-

speed, noise-shielded detector

• Switch-Mode Power Supply

Signal Isolation

• General Purpose Analog

Signal Isolation

• Transducer Isolation

Description

The HCPL-7800 high CMR

isolation amplifier provides a

unique combination of features

ideally suited for motor control

circuit designers. The product

provides the precision and

stability needed to accurately

monitor motor current in high-

noise motor control environ-

ments, providing for smoother

control (less “torque ripple”) in

various types of motor control

applications.

This product paves the way for a

smaller, lighter, easier to produce,

high noise rejection, low cost

solution to motor current

sensing. The product can also be

used for general analog signal

isolation applications requiring

high accuracy, stability and

linearity under similarly severe

noise conditions. For general

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.

Functional Diagram

Features

• 15 kV/

Rejection at V

• Compact, Auto-Insertable

Standard 8-pin DIP Package

• 4.6

Temperature

• 0.9 mV Input Offset Voltage

• 85 kHz Bandwidth

• 0.1% Nonlinearity

• Worldwide Safety Approval:

UL 1577 (3750 V rms/1 min),

VDE 0884 and CSA

• Advanced Sigma-Delta (

A/D Converter Technology

• Fully Differential Circuit

Topology

• 1

Applications

• Motor Phase Current

Sensing

• General Purpose Current

Sensing

• High-Voltage Power Source

Voltage Monitoring

*The terms common-mode rejection

(CMR) and isolation-mode rejection (IMR)

are used interchangeably throughout this

data sheet.

1

2

3

4

8

7

6

5

GND1

GND2

CMR SHIELD

+

+

-

-

5965-3592E