Agilent HCPL-7860/HCPL-786J

Optically Isolated

Sigma-Delta (

Σ−∆

Σ−∆

Σ−∆

Σ−∆

Σ−∆) Modulator

Data Sheet

Features

••••• 12-bit Linearity

••••• 200 ns Conversion Time (Pre-

Trigger Mode 2 with HCPL-0872)

••••• 12-bit Effective Resolution with 5

µµµµµs Signal Delay (14-bit with 102

µµµµµs) (with HCPL-0872)

••••• Fast 3 µµµµµs Over-Range Detection

(with HCPL-0872)

••••• ± 200 mV Input Range with Single

5 V Supply

••••• 1% Internal Reference Voltage

Matching

••••• Offset Calibration (with HCPL-

0872)

••••• -40°C to +85°C Operating

Temperature Range

••••• 15 kV/µµµµµs Isolation Transient

Immunity

••••• Safety Approval: UL 1577, CSA

and IEC/EN/DIN EN 60747-5-2

Applications

••••• Motor Phase and Rail Current

Sensing

••••• Data Acquisition Systems

••••• Industrial Process Control

••••• Inverter Current Sensing

••••• General Purpose Current Sensing

and Monitoring

Description

The HCPL-7860/HCPL-786J

Optically Isolated Modulator

and HCPL-0872 Digital

Interface IC or digital filter

together form an isolated

programmable two-chip

analog-to-digital converter. The

isolated modulator allows

direct measurement of motor

phase currents in power

inverters.

In operation, the HCPL-7860/

HCPL-786J Isolated Modulator

dielectric withstand voltage

rating) converts a low-

bandwidth analog input into a

high-speed one-bit data stream

by means of a Sigma-Delta (

Σ−

∆) over-sampling modulator.

This modulation provides for

high noise margins and

excellent immunity against

isolation-mode transients. The

modulator data and on-chip

sampling clock are encoded

and transmitted across the

isolation boundary where they

are recovered and decoded

into separate high-speed clock

and data channels.

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.

SPI and QSPI are trademarks of Motorola Corp.

Microwire is a trademark of National Semiconductor Inc.

SIGMA

DELTA

MOD./

ENCODE

DECODE

1

2

3

4

8

7

6

5

Input

Current

HCPL-0872

or

Digital Filter

MCU

or

DSP

HCPL-7860