參數(shù)資料
型號(hào)： HCPL-810J
英文描述： PLC Powerline DAA IC
中文描述： 集成電路的PLC電力線DAA
文件頁(yè)數(shù)： 13/16頁(yè)
文件大?。?/td> 307K
代理商： HCPL-810J
13
Applications Information
Typical application for FSK modulation
scheme
The HCPL-810J is designed to
work with various transceivers
and can be used with a variety
of modulation methods
including ASK, FSK and BPSK.
Figure 17 shows a typical
application in a powerline
modem using Frequency Shift
Keying (FSK) modulation
scheme.
Transmitter
The analogue Tx input pin is
connected to the modulator via
an external coupling capacitor
C1 and a series resistor R3 (see
Figure 17). Optimal performance
is obtained with an input signal
of 250
μ
A
PP
. E.g., for a
modulator with an output signal
of 0.5 V
PP
using a coupling
capacitor of 100 nF, the optimal
series resistor R3 would be 2
k
.
Tx AGC
To ensure a stable and constant
output voltage at Tx-PD-out, the
HCPL-810J includes an
Automatic Gain Control (AGC)
circuit in the isolated transmit
signal path.
Figure 17. Schematic of HCPL-810J application for FSK modulation scheme.
100 nF
Filter
GND2
100 μF
V
CC2
GND2
R
ref
24 k
C2
X2
GND2
L2
N
C1
100 nF
GND2
Status
D1
R4
2
100 nF
V
CC1
100 nF
GND2
1 μF
R1
5 k
R2
10 k
GND2
Rx-out
GND1
Filter
1 μF
GND1
Tx-en
Tx-in
R3
2 k
L
L1
330 μH
HCPL-810J
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Tx-en
Tx-in
Rx-PD-out
Rx-Amp-in
Status
Rx-out
V
CC1
GND1
R
ref
Rx-in
C
ext
Tx-LD-in
Tx-PD-out
V
CC2
Tx-out
GND2
This AGC circuit compensates
for variations in the input signal
level presented at Tx-in and
variations in the optical channel
over temperature and time. The
Tx-PD-out output signal is
effectively stabilized for input
Tx-in signals of between 150
μ
A
PP
and 250
μ
A
PP
(see Figure
8). The AGC circuit starts to
function 10
μ
s after the Tx-en
signal is set to logic high. After
a period of 180
μ
s the Tx-PD-
out signal typically reaches 66%
of its steady state level (see
Figure 18). To ensure correct
operation of the internal
circuitry, an external 1
μ
F
capacitor needs to be connected
from pin 11 to GND2.
The optical signal coupling
technology used in the HCPL-
810J transmit path achieves
very good harmonic distortion,
which is usually significantly
better than the distortion
performance of the modulated
input signal. However to meet
the requirements of some
international EMC regulations it
is often necessary to filter the
modulated input signal. The
optimal position for such a
filter is between pins 13 and 12
as shown in Figure 17. A
possible band-pass filter
topology is shown in Figure 19,
some typical values of the
components in this filter are
listed in Table 1.
Figure 18. Tx-PD-out AGC response time.
50
μ
s/Div
Tx-en 5 V/Div
Tx-PD-out 1 V/Div
t
s, Tx
t
AGC
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