HCPL-7840-560E Datasheet, PDF (10/19 Pages) AVAGO TECHNOLOGIES LIMITED – Isolation Amplifier

Notes:
General Note: Typical values represent the mean value of all characteriza-
tion units at the nominal operating conditions. Typical drift specifica-
tions are determined by calculating the rate of change of the specified
parameter versus the drift pa-rameter (at nominal operating conditions)
for each characterization unit, and then averaging the individual unit
rates. The corresponding drift figures 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 param-
eters held at their nominal operating values. Note that the typical drift
specifications in the tables below may differ from the slopes of the mean
curves shown in the corresponding figures.
1. Avago recommends operation with V = 0 V (tied to GND1).
IN-
Limiting V to 100 mV will improve DC nonlinearity and nonlinear-
IN+
ity drift. If V is brought above V – 2 V, an internal test mode may
IN-
DD1
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 Offset Change vs. Temperature.
3. Gain is defined as the slope of the best-fit line of differential output
voltage
(V –V ) vs. differential input voltage (V –V )
OUT+ OUT-
IN+ IN-
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. NL is the nonlinearity specified over an input voltage range of
100
±100 mV.
7. The input supply current decreases as the differential input voltage
(V_IN+–V_IN-) decreases.
8. The maximum specified output supply current occurs when the
differential input voltage (V –V ) = -200 mV, the maximum rec-
IN+ IN-
ommended operat-ing input voltage. However, the out-put 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
con-verter, 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 V_DD2 or ground.
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 at-
tenuated 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 ampli-
tude of the step is adjusted until the differential output (V –V )
OUT+ OUT-
exhibits more than a 200 mV deviation from the average output
voltage for more than 1μs. The HCPL-7840 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 differential amplitude of the transient at the
output of the HCPL-7840 when a 1 V , 1 MHz square wave with
pk-pk
40 ns rise and fall times is applied to both V and V .
DD1
DD2
16. In accordance with UL 1577, each optocoupler is proof tested by ap-
plying an insulation test voltage ≥4500 Vrms for 1 second (leakage
detection current limit, I ≤ 5 μA). This test is performed before the
I-O
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 VDE 0884 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.
10