HCPL-7800-300 HP [Agilent(Hewlett-Packard)], HCPL-7800-300 Datasheet - Page 9

• Manufacturer Part Number: HCPL-7800-300
• Description: High CMR Isolation Amplifiers
• Manufacturer: HP [Agilent(Hewlett-Packard)]

0.1 µF
25. Short circuit current is the amount of
26. IMR (also known as CMR or Common
27. IMRR is defined as the ratio of
Figure 1. Input Offset Voltage Test Circuit.
1-224
output current generated when either
output is shorted to V
Mode Rejection) specifies the mini-
mum rate of rise of an isolation mode
noise signal at which small output
perturbations begin to appear. These
output perturbations can occur with
both the rising and falling edges of the
isolation-mode wave form and may be
of either polarity. When the perturba-
tions first appear, they occur only
occasionally and with relatively small
peak amplitudes (typically 20-30 mV
at the output of the recommended
application circuit). As the magnitude
of the isolation mode transients
increase, the regularity and amplitude
of the perturbations also increase. See
applications section for more
information.
differential signal gain (signal applied
differentially between pins 2 and 3) to
+5 V
1
3
4
2
HCPL-7800
DD2
8
7
6
5
or ground.
+5 V
0.1 µF
10 K
10 K
0.33 µF
28. Output noise comes from two primary
the isolation mode gain (input pins
tied to pin 4 and the signal applied
between the input and the output of
the isolation amplifier) at 60 Hz,
expressed in dB.
sources: chopper noise and sigma-
delta quantization noise. Chopper
noise results from chopper stabiliza-
tion of the output op-amps. It occurs
at a specific frequency (typically 200
kHz at room temperature), and is not
attenuated by the internal output filter.
A filter circuit can be easily added to
the external post-amplifier to reduce
the total rms output noise. The
internal output filter does eliminate
most, but not all, of the sigma-delta
quantization noise. The magnitude of
the output quantization noise is very
small at lower frequencies (below 10
kHz) and increases with increasing
frequency. See applications section for
more information.
0.33 µF
+
-
+15 V
-15 V
AD624CD
GAIN = 1000
0.1 µF
0.1 µF
V
OUT
29. Data sheet value is the differential
30. This is a two-terminal measurement:
31. In accordance with UL1577, for
32. Case temperature was measured with a
Figure 2. Input-Referred Offset Drift
vs. Temperature.
-1000
1500
1000
amplitude of the transient at the
output of the HCPL-7800 when a
1 V
rise and fall times is applied to both
V
pins 1-4 are shorted together and pins
5-8 are shorted together.
devices with minimum V
3750 V
tested by applying an insulation test
voltage greater-than-or-equal-to 4500
V
detection limit, I
is performed before the method b,
100% production test for partial
discharge shown in the VDE 0884
Insulation Characteristics Table.
thermocouple located in the center of
the underside of the package.
-500
500
DD1
rms
0
pk-pk
-40
for one second (leak current
and V
rms
, 1 MHz square wave with 5 ns
-20
, each optocoupler is proof-
DD2
T – TEMPERATURE – °C
A
0
.
I-O
20
< 5 A). This test
40
ISO
specified at
60
MEAN
± 2 SIGMA
80
100