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ACPL-C78A-500E Datasheet(PDF) 8 Page - AVAGO TECHNOLOGIES LIMITED

Part # ACPL-C78A-500E
Description  Miniature Isolation Amplifiers
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Manufacturer  AVAGO [AVAGO TECHNOLOGIES LIMITED]
Direct Link  http://www.avagotech.com
Logo AVAGO - AVAGO TECHNOLOGIES LIMITED

ACPL-C78A-500E Datasheet(HTML) 8 Page - AVAGO TECHNOLOGIES LIMITED

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8
Notes:
General Note: Typical values represent the mean value of all char-
acterization units at the nominal operating conditions. Typical drift
specifications are determined by calculating the rate of change of the
specified parameter versus the drift parameter (at nominal operating
conditions) for each characterization unit, and then averaging the indi-
vidual unit rates. The corresponding drift figures are normalized to the
nominal operating conditions and show how much drift occurs as the
particular drift parameter is varied from its nominal value, with all other
parameters held at their nominal operating values. Note that the typical
drift specifications in the tables may differ from the slopes of the mean
curves shown in the corresponding figures.
1. It is recommended to operate with VIN– = 0 V (tied to GND1). Limiting
VIN+ to 100 mV will improve DC nonlinearity and nonlinearity drift.
If VIN– is brought above VDD1 – 2 V, an internal test mode may be
activated. This test mode is for LED coupling test and is not intended
for customer use.
2. This is the Absolute Value of Input Offset Change vs. Temperature.
3. Gain is defined as the slope of the best-fit line of differential output
voltage (VOUT+–VOUT–) vs. differential input voltage (VIN+–VIN–) over
the specified input range.
4. This is the Absolute Value of Gain Change vs. Temperature.
5. Nonlinearity is defined as half of the peak-to-peak output deviation
from the best-fit gain line, expressed as a percentage of the full-scale
differential output voltage.
6. NL100 is the nonlinearity specified over an input voltage range of
±100 mV.
7. The input supply current decreases as the differential input voltage
(VIN+–VIN–) decreases.
8. The maximum specified output supply current occurs when the
differential input voltage (VIN+–VIN–) = –200 mV, the maximum
recommended operating input voltage. However, the output supply
current will continue to rise for differential input voltages up to
approximately –300 mV, beyond which the output supply current
remains constant.
9. Because of the switched-capacitor nature of the input sigma-delta
converter, time-averaged values are shown.
10. When the differential input signal exceeds approximately 308 mV,
the outputs will limit at the typical values shown.
11. Short circuit current is the amount of output current generated when
either output is shorted to VDD2 or GND2.
12. CMRR is defined as the ratio of the differential signal gain (signal
applied differentially between pins 2 and 3) to the common-mode
gain (input pins tied together and the signal applied to both inputs
at the same time), expressed in dB.
13. Output noise comes from two primary sources: chopper noise and
sigma-delta quantization noise. Chopper noise results from chopper
stabilization of the output op-amps. It occurs at a specific frequency
(typically 400 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.
14. CMTI (Common Mode Transient Immunity or CMR, Common Mode
Rejection) is tested by applying an exponentially rising/falling voltage
step on pin 4 (GND1) with respect to pin 5 (GND2). The rise time of
the test waveform is set to approximately 50 ns. The amplitude of the
step is adjusted until the differential output (VOUT+–VOUT–) exhibits
more than a 200 mV deviation from the average output voltage for
more than 1μs. The ACPL-C78A/C780/C784 will continue to function
if more than 10 kV/μs common mode slopes are applied, as long as
the breakdown voltage limitations are observed.
15. Data sheet value is the differential amplitude of the transient at the
output of the ACPL-C78A/C780/C784 when a 1 Vpk-pk, 1 MHz square
wave with 40 ns rise and fall times is applied to both VDD1 and VDD2.
16. In accordance with UL 1577, each optocoupler is proof tested by
applying an insulation test voltage ≥6000 Vrms for 1 second (leakage
detection current limit, II-O ≤ 5 μA). This test is performed before the
100% production test for partial discharge (method b) shown in IEC/
EN/DIN EN 60747-5-5 Insulation Characteristic Table.
17. The Input-Output Momentary Withstand Voltage is a dielectric
voltage rating that should not be interpreted as an input-output
continuous voltage rating. For the continuous voltage rating, refer
to the IEC/EN/DIN EN 60747-5-5 insulation characteristics table and
your equipment level safety specification.
18. This is a two-terminal measurement: pins 1–4 are shorted together
and pins 5–8 are shorted together.
Figure 1. Input Offset Voltage Test Circuit.
0.1 µF
VDD2
VOUT
8
7
6
1
3
ACPL-C78A
ACPL-C780
ACPL-C784
5
2
4
0.1 µF
10 K
10 K
VDD1
+15 V
0.1 µF
0.1 µF
-15 V
+
AD624CD
GAIN = 100
0.47
µF
0.47
µF


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