Agilent HCPL-7860/HCPL-786J
Optically Isolated
Sigma-Delta (Σ−∆) Modulator
Data Sheet
In operation, the HCPL-7860/
HCPL-786J Isolated Modulator
Features
• 12-bit Linearity
(optocoupler with 3750 V
RMS
• 200 ns Conversion Time (Pre-
dielectric withstand voltage
rating) converts a low-
Trigger Mode 2 with HCPL-0872)
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.
• 12-bit Effective Resolution with 5
µs Signal Delay (14-bit with 102
µs) (with HCPL-0872)
Description
• Fast 3 µs Over-Range Detection
(with HCPL-0872)
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.
•
200 mꢀ Input Range with Single
5 ꢀ Supply
• 1% Internal Reference ꢀoltage
Matching
• Offset Calibration (with HCPL-
0872)
• -40°C to +85°C Operating
Temperature Range
• 15 kꢀ/µs Isolation Transient
Immunity
• Safety Approval: UL 1577, CSA
1
8
7
and IEC/EN/DIN EN 60747-5-2
SIGMA
DELTA
MOD./
ENCODE
2
Applications
HCPL-0872
or
Digital Filter
MCU
or
DSP
Input
Current
DECODE
• Motor Phase and Rail Current
3
4
6
5
Sensing
• Data Acquisition Systems
• Industrial Process Control
• Inverter Current Sensing
HCPL-7860
• General Purpose Current Sensing
and Monitoring
A 0.1 µF bypass capacitor must be connected between pins V and Ground
DD
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.