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Agilent - Optically Isolated Sigma-Delta Modulator

Numéro de référence HCPL-786J
Description Optically Isolated Sigma-Delta Modulator
Fabricant Agilent 
Logo Agilent 





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HCPL-786J fiche technique
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
45
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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