9
Notes:
General Note: Typical values represent the mean value of all char-
acterization units at the nominal operating conditions. Typical drift
specications are determined by calculating the rate of change of the
specied parameter versus the drift pa-rameter (at nominal operat-
ing conditions) for each characterization unit, and then averaging the
individual unit rates. The corresponding drift gures are normalized
to the nominal operating conditions and show how much drift occurs
as the par-ticular drift parameter is varied from its nominal value, with
all other parameters held at their nominal operating values. Note that
the typical drift specications in the tables below may dier from the
slopes of the mean curves shown in the corresponding gures.
1. Avago Technologies recommends operation with V
IN-
= 0 V (tied to
GND1). Limiting V
IN+
to 100 mV will improve DC nonlinearity and
nonlinearity drift. If V
IN-
is brought above V
DD1
– 2 V, an internal test
mode may be activated. This test mode is for testing LED coupling
and is not intended for customer use.
2. This is the Absolute Value of Input Oset Change vs. Temperature.
3. Gain is dened as the slope of the best-t line of dierential output
voltage (V
OUT+
–V
OUT-
) vs. dierential input voltage (V
IN+
–V
IN-
) over
the specied input range.
4. This is the Absolute Value of Gain Change vs. Temperature.
5. Nonlinearity is dened as half of the peak-to-peak output deviation
from the best-t gain line, expressed as a percentage of the full-
scale dierential output voltage.
6. NL
100
is the nonlinearity specied over an input voltage range of
±100 mV.
7. The input supply current decreases as the dierential input voltage
(V
IN+
–V
IN-
) decreases.
8. The maximum specied output supply current occurs when the
dierential input voltage (V
IN+
–V
IN-
) = -200 mV, the maximum rec-
ommended operat-ing input voltage. However, the out-put sup-
ply current will continue to rise for dierential 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
con-verter, time-averaged values are shown.
10. When the dierential 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 V
DD2
or ground.
12. CMRR is dened as the ratio of the dierential signal
gain (signal applied dierentially 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 specic
frequency (typically 400 kHz at room temperature), and is not at-
tenuated by the internal output lter. A lter circuit can be easily
added to the external post-amplier to reduce the total rms output
noise. The internal output lter 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 volt-
age 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 dierential output (V
OUT+
–V
OUT-
)
exhibits more than a 200 mV deviation from the average output
voltage for more than 1µs. The HCPL-7800(A) will continue to func-
tion 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 dierential amplitude of the transient at the
output of the HCPL-7800(A) when a 1 V
pk-pk
, 1 MHz square wave
with 40 ns rise and fall times is applied to both V
DD1
and V
DD2
.
16. In accordance with UL 1577, each optocoupler is proof tested by ap-
plying an insulation test voltage ≥4500 V
rms
for 1 second (leakage
detection current limit, I
I-O
≤ 5 µA). This test is performed before
the 100% production test for partial discharge (method b) shown in
IEC/EN/DIN EN 60747-5-2 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 60747-5-2 insulation characteristics table and
your equipment level safety specication.
18. This is a two-terminal measurement: pins 1–4 are shorted together
and pins 5–8 are shorted together.
