HCPL-800J-000E Avago Technologies US Inc., HCPL-800J-000E Datasheet - Page 16

• Manufacturer Part Number: HCPL-800J-000E
• Description: OPTOCOUPLER DAA PLC ISO 16SOIC
• Manufacturer: Avago Technologies US Inc.

Specifications of HCPL-800J-000E

• Package / Case: SO-16
• Mounting Type: Surface Mount
• Current - Supply: 28mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Applications: Powerline Data Access
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 1. Typical component values for band-pass filter and LC coupling network.
Carrier Frequency (kHz)
110
120
132
150
To compensate for the
attenuation in the filter, the line
driver stage has 6 dB gain. To
prevent the line driver output
from saturating, it is therefore
important to achieve 6 dB of
attenuation between Tx- PD- out
(pin 13) and Tx- LD- in (pin 12)
either by the inherent filter
attenuation or by other means.
Transmitter Line Driver
The line driver is capable of
driving powerline load
impedances with output signals
up to 4 V
of the line driver is controlled
externally via a resistor R
connected from pin 9 to GND2.
The optimum biasing point value
for modulation frequencies up to
150 kHz is 24 kΩ. For higher
frequency operation with certain
modulation schemes, it may be
necessary to reduce the resistor
value to enable compliance with
international regulations.
The output of the line driver is
coupled onto the powerline using
a simple LC coupling circuit as
shown in Figure 28. Refer to
Table 1 for some typical
component values. Capacitor C2
and inductor L1 attenuate the
50/60 Hz powerline transmission
16
Figure 27. An example of a band-pass filter for transmit.
Filter input
PP
. The internal biasing
R5
Band-Pass Filter
L3 (µH)
680
680
680
680
GND2
L3
ref
C3
C3 (nF)
3.3
2.7
2.2
1.8
frequency. A suitable value for
L1 can range in value from 200
µH to 1 mH. To reduce the
series coupling impedance at the
modulation frequency, L2 is
included to compensate the
reactive impedance of C2. This
inductor should be a low
resistive type capable of meeting
the peak current requirements.
To meet many regulatory
requirements, capacitor C2 needs
to be an X2 type. Since these
types of capacitors typically have
a very wide tolerance range of
20%, it is recommended to use
as low Q factor as possible for
the L2/C2 combination. Using a
high Q coupling circuit will
result in a wide tolerance on the
overall coupling impedance,
causing potential communication
difficulties with low powerline
impedances. Occasionally with
other circuit configurations, a
high Q coupling arrangement is
recommend, e.g., C2 less than
100 nF. In this case it is
normally used as a compromise
to filter out of band harmonics
originating from the line driver.
This is not required with the
HCPL- 800J.
Filter output
LC Coupling
L2 (µH)
15
10
6.8
6.8
C2 (nF)
150
220
220
220
Tx
Rx
Although the series coupling
impedance is minimized to
reduce insertion loss, it has to
be sufficiently large to limit the
peak current to the desired
level in the worst expected
powerline load condition. The
peak output current is
effectively limited by the total
series coupling resistance,
which is made up of the series
resistance of L2, the series
resistance of the fuse and any
other resistive element
connected in the coupling
network.
To reduce power dissipation
when not operating in transmit
mode the line driver stage is
shut down to a low power high
impedance state by pulling the
Tx- en input (pin 1) to logic low
state. The high impedance
condition helps minimize
attenuation on received signals.
Figure 28. LC coupling network.
1µF
L2
GND2
L1
C2
X2
L
N