HCPL-0870 datasheet(3/28 Pages) HP

3 / 28 page

1-262

isolated modulator without

additional hardware. Because the

two inputs are multiplexed, only

one conversion at a time can be

made and not all features are

available for the second channel.

The available features for both

channels are shown in the table

at right.

HCPL-x870 Digital Interface IC

Feature

Channel #1

Channel #2

Conversion Mode

Offset Calibration

Pre-Trigger Mode

Over-Range Detection

Adjustable Threshold Detection

MDAT1

MCLK2

THR1

CON-

VERSION

INTER-

FACE

CONFIG.

INTER-

FACE

MDAT2

OVR1

GND

RESET

CCLK

CLAT

VDD

CHAN

CDAT

SCLK

MCLK1

SDAT

CH1

CH2

THRES-

HOLD

DETECT

RESET

Functional Diagrams

Pin Description, Isolated Modulator

Symbol

Description

Symbol

Description

VDD1

Supply voltage input (4.5 V to 5.5 V)

VDD2

Supply voltage input (4.5 V to 5.5 V)

VIN+

Positive input (

± 200 mV

MCLK

Clock output (10 MHz typical)

recommended)

VIN–

Negative input

MDAT

Serial data output

(normally connected to GND1)

GND1

Input ground

GND2

Output ground

HCPL-7860 Isolated Modulator

HCPL-x870 Digital Interface IC

VDD1

VIN+

VIN–

GND1

VDD2

MCLK

MDAT

GND2

SHIELD

ISOLATION

BOUNDARY

DECODE

SIGMA-

DELTA

MOD./

ENCODE

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