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HCPL-7800-300 Datasheet(PDF) 14 Page - Agilent(Hewlett-Packard)

Part No. HCPL-7800-300
Description  High CMR Isolation Amplifiers
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Maker  HP [Agilent(Hewlett-Packard)]
Homepage  http://www.home.agilent.com
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HCPL-7800-300 Datasheet(HTML) 14 Page - Agilent(Hewlett-Packard)

 
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HCPL-7800
+5 V
+15 V
0.01 µF
C4
0.1 µF
C8
0.1 µF
C7
0.1 µF
R4
10.0 K
C6
75 pF
R1
2.00 K
R2
2.00 K
-15 V
MC34081
+
-
VOUT
C1
0.1 µF
C5
75 pF
+
-
MOTOR
U2
OUT
C2
0.1 µF
HV-
HV+
U3
R SENSE
R3
10.0 K
FLOATING
POSITIVE
SUPPLY
GATE DRIVE
CIRCUIT
IN
R5
39
U1
78L05
C3
Applications Information
Functional Description
Figure 28 shows the primary
functional blocks of the HCPL-
7800. In operation, the sigma-
delta analog-to-digital converter
converts the analog input signal
into a high-speed serial bit
stream, the time average of which
is directly proportional to the
input signal. This high speed
stream of digital data is encoded
and optically transmitted to the
detector circuit. The detected
signal is decoded and converted
into accurate analog voltage
levels, which are then filtered to
produce the final output signal.
To help maintain device accuracy
over time and temperature,
internal amplifiers are chopper-
stabilized. Additionally, the
encoder circuit eliminates the
effects of pulse-width distortion of
the optically transmitted data by
generating one pulse for every
edge (both rising and falling) of
the converter data to be
transmitted, essentially converting
the widths of the sigma-delta
output pulses into the positions
of the encoder output pulses. A
significant benefit of this coding
scheme is that any non-ideal
characteristics of the LED (such
as non-linearity and drift over
time and temperature) have little,
if any, effect on the performance
of the HCPL-7800.
Figure 27. Dependence of Safety-
Limiting Parameters on Ambient
Temperature.
Figure 26. Recommended Application Circuit.
0
0
TA – TEMPERATURE – °C
180
400
120
40
80
160
100
200
300
OUTPUT POWER, PS
INPUT POWER, PS
20
60
100
140
175


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