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DC CORRECTNESS ISSUES
The sample daughterboards provided with the AVRQ-5-B are designed to bias the input
side of the optocoupler with a fixed bias during the test. To change it, components must
be physically changed. This can be problematic with certain devices that do not
necessarily power-up to a well-defined state. The NVE IL710 is an example of such a
device – as the IL710 datasheet says:
“To minimize power dissipation, input signals are differentiated and then latched on the
output side of the isolation barrier to reconstruct the signal. This could result in an
ambiguous output state depending on power up, shutdown and power loss sequencing.
Therefore, the designer should consider including an initialization signal in the start-up
circuit. Initialization consists of toggling the input either high then low, or low then high.”
The user may wish to add power-up toggle circuitry, or an oscillator, in order to
correctly initialize and drive such devices.
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Summary of Contents for AVRQ-5-B
Page 52: ...Bottom side 52 ...
Page 57: ...PCB 299B FOR ADUM241E0BRWZ 57 ...
Page 82: ...PCB 158R2 LOW VOLTAGE POWER SUPPLY ...
Page 87: ...DUT WIRING ON STANDARD DAUGHTERBOARD PCB 267C ...
Page 88: ...DUT WIRING ON CUSTOMIZED TLP2366 DAUGHTERBOARD PCB 298B ...
Page 89: ...DUT WIRING ON CUSTOMIZED ADUM241E0BRWZ DAUGHTERBOARD PCB 299B ...
Page 91: ...PERFORMANCE CHECK SHEET 91 ...