Agilent HCPL-7560
Optically Isolated Sigma-Delta (Σ-∆)
Σ∆
Modulator
Data Sheet
Features
•
8-bit Linearity
Description
The HCPL-7560 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-7560
Isolated Modulator
(optocoupler with 3750 V
RMS
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.
•
200 ns Conversion Time (Pre-
Trigger Mode 2 with HCPL-0872)
•
8-bit Effective Resolution with 5 ìs
Signal Delay (14-bit with 102
µ
s)
(with HCPL-0872)
•
Fast 3
µ
s Over-Range Detection
(with HCPL-0872)
•
± 200 mV Input Range with Single
5 V Supply
•
5% Internal Reference Voltage
Matching
•
Offset Calibration (with HCPL-
0872)
•
-40°C to +85°C Operating
Temperature Range
•
15 kV/µs Isolation Transient
µ
Immunity
1
8
•
Safety Approval: UL 1577, CSA
and IEC/EN/DIN EN 60747-5-2
HCPL-0872
-
or
Digital Filter
MCU
or
DSP
2
Input
Curr ent
3
SIGMA-
-
DELTA
MOD./
ENCODE
7
DECODE
6
Applications
•
Motor Phase and Rail Current
Sensing
•
Data Acquisition Systems
•
Industrial Process Control
•
Inverter Current Sensing
•
General Purpose Current Sensing
and Monitoring
4
5
HCPL-7560
-
A 0.1 µF bypass capacitor must be connected between pins V
DD
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.
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
