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HCPL-4100-000E 光电耦合的 20mA 电流环路发射器
HCPL-4100 20mA 隔离电流环路发射器被用在使用 20mA 电流环路的设备中。通常,20mA 电流环路系统发射 20 mA 环路电流 (MARK) 来标志逻辑高电平,同时允许不超过几毫安的环路电流 (SPACE) 来标志逻辑低电平。
从逻辑输入到 20mA 电流环路的信号光电耦合打破接地环路并实现对共模干扰的极高抑制性。
数据输入兼容 LSTTL、TTL,或 CMOS 逻辑门。输入集成电路驱动 GaAsP LED。 LED 发射的光由二次集成电路感应。该集成电路在没有光被发射时允许 20mA 的电流通过和少于 2.7V 的电压降;在光被发射时,允许低于 2mA 的电流通过。发射器输出可耐受 27V 的电压。输入集成电路提供可控制的 LED 驱动电流,并算入任何 LED 光输出衰减。内置屏蔽可保证 1000 V/ms 共模瞬态抑制。
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