1-233

5965-3591E

H

High CMR Analog Isolation

Amplifiers

Technical Data

Features

• Fast Propagation Delays for

Over-Current and Fault

Detection Sensing

• High Common Mode

Rejection (CMR): 30 kV/

• 3% Gain Tolerance:

HCPL-7820

5% Gain Tolerance:

HCPL-7825

• 0.05% Nonlinearity

• Low Offset Voltage and Off-

set Drift vs. Temperature

• 200 kHz Bandwidth

• Performance Specified for

Common Motor Control

Applications over -40

100

• Worldwide Safety and

Regulatory Approval: UL

1577 (3750 V rms/1 Min),

VDE 0884 and CSA

• Compact Auto-Insertable

Standard 8-Pin DIP Package

• Advanced Sigma-Delta (

Σ

A/D Converter Technology

• 1

Applications

• Motor Phase and Rail

Current Sensing

• General Purpose Current

Sensing and Monitoring

• High-Voltage Monitoring

• Switched Mode Power

Supply Signal Isolation

• General Purpose Analog

Signal Isolation

• Transducer Isolation

Description

The HCPL-7820/7825 high CMR

isolation amplifier consists of a

sigma-delta analog-to-digital

converter optically coupled to an

integrated output digital-to-analog

converter. When used with a

shunt resistor in the current path,

the HCPL-7820/7825 provides a

cost-effective, auto-insertion

compatible current sense solution.

Fast propagation delays allow this

part to be used in either motor

drive or inverter applications for

either phase current monitoring

or rail current fault detection

applications. High isolation mode

*The terms common-mode rejection (CMR) and isolation-mode rejection (IMR) are used interchangeably throughout this data sheet.

A 0.1

µF bypass capacitor must be connected between pins 1 and 4 and between pins 5 and 8.

rejection makes this product

suitable for noisy electrical

environments, such as those

generated by the high switching

rates of power IGBTs. Low offset

voltage together with low offset

change vs. temperature permits

accurate use of auto-calibration

techniques. Tight gain tolerance

with good nonlinearity further

provide the characteristics needed

to insure highly accurate motor

speed control. A high operating

temperature range with specified

performance parameters allow

HCPL-7820

HCPL-7825

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

1

IDD1

2

3

4

VDD1

VIN+

VIN–

GND1

8

IDD2

7

6

5

VDD2

VOUT+

VOUT–

GND2

+

–

+

–

CMR SHIELD