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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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Содержание AVRQ-5-B
Страница 52: ...Bottom side 52 ...
Страница 56: ...Top side Bottom side A P6246 differential probe was used to observe the logic outputs in the TLP2366 tests 56 ...
Страница 57: ...PCB 299B FOR ADUM241E0BRWZ 57 ...
Страница 82: ...PCB 158R2 LOW VOLTAGE POWER SUPPLY ...
Страница 87: ...DUT WIRING ON STANDARD DAUGHTERBOARD PCB 267C ...
Страница 88: ...DUT WIRING ON CUSTOMIZED TLP2366 DAUGHTERBOARD PCB 298B ...
Страница 89: ...DUT WIRING ON CUSTOMIZED ADUM241E0BRWZ DAUGHTERBOARD PCB 299B ...
Страница 91: ...PERFORMANCE CHECK SHEET 91 ...