HCPL-7840
Isolation Amplifier
Data Sheet
Lead (Pb) Free
RoHS 6 fully
compliant
RoHS 6 fully compliant options available;
-xxxE denotes a lead-free product
Description
The HCPL-7840 isolation amplifier family was designed
for current sensing in electronic motor drives. In a typical
implementation, motor currents flow through an external
resistor and the resulting analog voltage drop is sensed by
the HCPL-7840. A differential output voltage is created on
the other side of the HCPL-7840 optical isolation barrier.
This differential output voltage is proportional to the
motor current and can be converted to a single-ended
signal by using an op-amp as shown in the recommended
application circuit. Since common-mode voltage swings
of several hundred volts in tens of nanoseconds are
common in modern switching inverter motor drives, the
HCPL-7840 was designed to ignore very high common-
mode transient slew rates (of at least 10 kV/μs).
The high CMR capability of the HCPL-7840 isolation
amplifier provides the precision and stability needed to
accurately monitor motor current in high noise motor
control environ-ments, providing for smoother control
(less “torque ripple”) in various types of motor control
applications.
The product can also be used for general analog signal
isolation applications requiring high accuracy, stability,
and linearity under similarly severe noise con-ditions. For
general applications, we recommend the HCPL-7840 (gain
tolerance of ± 5%). The HCPL-7840 utilizes sigma delta
(∑-Δ) analog-to-digital converter technology, chopper
stabilized amplifiers, and a fully differential circuit topol-
ogy fabricated using Avago’s 0.8 μm CMOS IC process.
Together, these features deliver unequaled isolation-
mode noise rejection, as well as excellent offset and gain
accuracy and stability over time and temperature. This
performance is delivered in a compact, auto-insertable,
industry standard 8-pin DIP package that meets world-
wide regulatory safety standards. (A gull-wing surface
mount option #300 is also available).
Features
15 kV/μs common-mode rejection at V
CM
= 1000 V
Compact, auto-insertable standard 8-pin DIP package
0.00025 V/V/°C gain drift vs. temperature
0.3 mV input offset voltage
100 kHz bandwidth
0.004% nonlinearity
Worldwide safety approval:
UL 1577 (3750 Vrms/1 min.)
and CSA, IEC/EN/DIN EN 60747-5-2
Advanced Sigma-Delta (∑-Δ) A/D converter technol-
ogy
Fully differential circuit topology
0.8 μm CMOS IC technology
Applications
Motor phase and rail current sensing
Inverter current sensing
Switched mode power supply signal isolation
General purpose current sensing and monitoring
General purpose analog signal isolation
Functional Diagram
I
DD1
V
DD1
V
IN+
V
IN–
GND1
1
2
3
4
I
DD2
8
V
DD2
V
OUT+
V
OUT–
GND2
+
–
+
–
7
6
5
SHIELD
A 0.1 μF bypass capacitor must be connected
between pins 1 and 4 and between pins 5 and 8.
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.
Ordering Information
HCPL-7840 is UL Recognized with 3750 Vrms for 1 minute per UL1577.
Option
Part
Number
RoHS
Compliant
-000E
-300E
HCPL-7840 -500E
-060E
-360E
-560E
non RoHS
Compliant
no option
#300
#500
#060
#360
#560
Package
Surface
Mount
Gull
Wing
Tape
& Reel
IEC/EN/DIN
EN 60747-5-2
X
Quantity
50 per tube
50 per tube
1000 per reel
50 per tube
50 per tube
1000 per reel
X
300 mil DIP-8
X
X
X
X
X
X
X
X
X
X
X
X
X
X
To order, choose a part number from the part number column and combine with the desired option from the option
column to form an order entry.
Example 1:
HCPL-7840-560E to order product of Gull Wing Surface Mount package in Tape and Reel packaging with IEC/EN/DIN
EN 60747-5-2 Safety Approval and RoHS compliant.
Example 2:
HCPL-7840 to order product of 300 mil DIP package in Tube packaging and non RoHS compliant.
Option datasheets are available. Contact your Avago sales representative or authorized distributor for information.
Remarks: The notation ‘#XXX’ is used for existing products, while (new) products launched since July 15, 2001 and
RoHS compliant will use ‘–XXXE.’
2
Embedded System
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