Isolated receiver/converter uses multichannel opto-isolator

Isolated receiver/converter uses multichannel opto-isolator

The incoming 4- to 20-mA current-mode signal is subdivided in a 1:4 ratio between the active coupler pair U2b and passive pairs U2a and U2d. This division provides a more manageable 0.8- to 4-mA signal to the downstream receiver circuitry. The 1:4 current ratio is approximately established by the 10...

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Veröffentlicht in:Electronic Design 2009-02, Vol.57 (4), p.42-42
1. Verfasser: Woodward, W. Stephen
Format: Magazinearticle
Sprache:eng
Schlagworte:
Design engineering
Electric current converters
Light emitting diodes
Optoelectronics
Receivers & amplifiers
Transistors
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Beschreibung
Zusammenfassung:The incoming 4- to 20-mA current-mode signal is subdivided in a 1:4 ratio between the active coupler pair U2b and passive pairs U2a and U2d. This division provides a more manageable 0.8- to 4-mA signal to the downstream receiver circuitry. The 1:4 current ratio is approximately established by the 1000- and 249-. series resistors and improved by the 31-k. linearity compensation resistance in parallel with LED b.
ISSN:0013-4872
1944-9550