HCPL4100 HP [Agilent(Hewlett-Packard)], HCPL4100 Datasheet - Page 10
HCPL4100
Manufacturer Part Number
HCPL4100
Description
Optically Coupled 20 mA Current Loop Transmitter
Manufacturer
HP [Agilent(Hewlett-Packard)]
Datasheet
1.HCPL4100.pdf
(12 pages)
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Part Number:
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Figure 12. Recommended Non-Isolated Active Receiver with HCPL-4100 Isolated Transmitter for Simplex Point to Point
20 mA Current Loop.
25% distortion data rate at
different V
distortion data rate is defined as
that rate at which 25% distortion
occurs to output bit interval with
respect to the input bit interval.
Maximum data rate (dotted line)
is restricted by device character-
istics. An input Non-Return-to-
Zero (NRZ) test waveform of 16
bits (0000001011111101) was
used for data rate distortion
measurements. Enhanced speed
performance of the loop system
can be obtained with lower V
supply levels, as illustrated in
Figure 14. In addition, when loop
current is supplied through a
resistor instead of by a current
source, an additional series
termination resistance equal to
the characteristic line impedance
can be used at the HCPL-4100
transmitter end to enhance speed
of response by approximately
20%.
CC
values. 25%
CC
The cable used contained five
pairs of unshielded, twisted, 22
AWG wire (Dearborn #862205).
Loop current is 20 mA nominal.
Input and output logic supply
voltages are 5 V dc.
Full Duplex
The full duplex point-to-point
communication of Figure 15 uses
Figure 13. Minimum Required Supply
Voltage, V
Current Loop Circuit of Figure 13.
28
24
20
40
36
32
16
12
8
4
0
L – LOOP LENGTH (ONE DIRECTION) METERS
0
V
R
I
V
V
T
LOOP
CC
MARK
SAT
A
CABLE
CC
= 25 °C
= 0.00212 — (L) + 5.7 V
= 1.5 Vdc (CURRENT SOURCE)
, vs. Loop Length for
= 20 mA
= 2.7 Vdc (HCPL-4100)
= 0.05296 /m
100
m
V
1000
10000
10
a four wire system to provide
simultaneous, bidirectional data
communication between local
and remote equipment. The basic
application uses two simplex
point-to-point loops which have
two separate, active, non-isolated
units at one common end of the
loops. The other end of each loop
is isolated.
Figure 14. Typical Data Rate vs.
Distance and Supply Voltage.