Avago Technologies has developed a new family of low-power optocouplers targeting designers of communication interfaces (RS485, CANBus, and I²C), microprocessor system interfaces, and digital isolation for A-D and D-A conversion applications. Utilising a unique integrated circuit design and thick insulation material, the ACPL-M61L/061L/064L/W61L/K64L optocouplers offer low power requirements while still providing good isolation and insulation.
The 10 Mbps digital optocouplers combine a high-efficiency light emitting diode (LED) and an integrated high gain photo detector, which results in low forward drive current of 1,6 mA, enabling designers to interface the optocoupler input directly from a microcontroller output – eliminating the need for buffers to drive the LED. Moreover, the use of the LED input with a Faraday-shielded photodetector circuit enables common mode noise immunity of 35 kV/μs. This optocoupler family supports both 3,3 V and 5 V supply voltages, and provides reliable system performance in industrial temperatures ranging from -40°C to +105°C.
The optocouplers integrate a feature similar to ‘under-voltage lock-out’ that prevents output disruption during a power supply loss or system recovery. Additionally, the output of these optocouplers is designed with a slew-rate controlled feature to allow the voltage rise and fall times to be controlled over a wide range of load capacitances.
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