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HCPL-7860

Optically Isolated Sigma-Delta (Σ−∆) Modulator

Agilent Technologies, Inc 

Agilent HCPL-7860/HCPL-786J

Optically Isolated

Sigma-Delta (Σ−∆) Modulator

Data Sheet

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.

1

In operation, the HCPL-7860/

HCPL-786J Isolated Modulator

(optocoupler with 3750 VRMS

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.

8

Features

• 12-bit Linearity

• 200 ns Conversion Time (Pre-

Trigger Mode 2 with HCPL-0872)

• 12-bit Effective Resolution with 5

µs Signal Delay (14-bit with 102

µs) (with HCPL-0872)

• Fast 3 µs 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/µs Isolation Transient

Immunity

• Safety Approval: UL 1577, CSA

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

Input

Current

2 SIGMA

7

DELTA

MOD./

DECODE

3 ENCODE

6

4

5

HCPL-7860

HCPL-0872

or

Digital Filter

MCU Applications

or

DSP

• Motor Phase and Rail Current

Sensing

• Data Acquisition Systems

• Industrial Process Control

• Inverter Current Sensing

• General Purpose Current Sensing

and Monitoring

A 0.1 µF bypass capacitor must be connected between pins VDD and Ground

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.

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