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HCPL7840 Datasheet

  • HCPL7840

  • Analog Isolation Amplifier

  • 218.79KB

  • 12頁

  • AGILENT   AGILENT

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H
Analog Isolation Amplifier
Technical Data
HCPL-7840
Features
鈥?High Common Mode
Rejection (CMR): 15 kV/
碌
s
at V
CM
= 1000 V
鈥?5% Gain Tolerance
鈥?0.1% Nonlinearity
鈥?Low Offset Voltage and Off-
set Temperature Coefficient
鈥?100 kHz Bandwidth
鈥?Performance Specified Over
-40
擄
C to 85
擄
C Temperature
Range
鈥?Recognized Under UL 1577
and CSA Approved for
Dielectric Withstand Proof
Test Voltage of 2500 Vac, 1
Minute
鈥?Standard 8-Pin DIP Package
Description
The HCPL-7840 isolation ampli-
fier provides accurate, electrically
isolated and amplified representa-
tions of voltage and current.
When used with a shunt resistor
in the current path, the HCPL-
7840 offers superior reliability,
cost effectiveness, size and
autoinsertability compared with
the traditional solutions such as
current transformers and Hall-
effect sensors.
The HCPL-7840 consists of a
sigma-delta analog-to-digital
converter optically coupled to a
digital-to-analog converter.
Superior performance in design
critical specifications such as
common-mode rejection, offset
voltage, nonlinearity, operating
temperature range and regulatory
compliance make the HCPL-7840
the clear choice for designing
reliable, lower-cost, reduced-size
products such as motor
controllers and inverters.
Common-mode rejection of
15 kV/碌s makes the HCPL-7840
suitable for noisy electrical
environments such as those
generated by the high switching
rates of power IGBTs.
Low offset voltage together with
a low offset voltage temperature
coefficient permits accurate use
of auto-calibration techniques.
Gain tolerance of 5% with 0.1%
nonlinearity further provide the
performance necessary for
accurate feedback and control.
A wide operating temperature
range with specified performance
allows the HCPL-7840 to be used
in hostile industrial environments.
Functional Diagram
I
DD1
V
DD1
V
IN+
V
IN鈥?/div>
GND1
1
2
3
4
+
鈥?/div>
+
鈥?/div>
I
DD2
8
7
V
DD2
V
OUT+
V
OUT鈥?/div>
GND2
Applications
鈥?Motor Phase and Rail
Current Sensing
鈥?Inverter Current Sensing
鈥?Switched Mode Power
Supply Signal Isolation
鈥?General Purpose Current
Sensing and Monitoring
鈥?General Purpose Analog
Signal Isolation
6
5
SHIELD
A 0.1 F 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.
1-248
5965-4784E

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