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6N139 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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6N139 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 4 page Application Note AN-3002 Low Current Input Circuit Ideas 6N138/139 Series www.fairchildsemi.com REV. 4.00 4/30/02 Introduction Advancements in opto-coupling and LED technology have given us the 6N139. This unique optocoupler, having an input LED current specification at 500 microamperes, has opened some interesting design doors. Besides the obvious and much written about ability to be directly driven by CMOS circuits, the 6N139 can be considered for signal detection, transient detection, matrices and non-loading line receiving. Following are but a few circuit ideas to stimulate the designer’s interest. Signal Detection The detection of noise, spikes or oscillations can easily and directly be detected by the input of the 6N139 as shown in the circuit of Figure 1. Figure 1. 6N139 Input Circuit For Signal Detection For the detection of undesirable signals on a D.C. power source use: C=To inject 500 microamperes into LED X=Latching or non-latching output circuitry to follow LED=Input diode of 6N139 The LED is provided with a 50 microampere forward current to charge the LED capacity to the VF level. In this way, the LED is not causing conduction in its output circuitry but is prepared to conduct very quickly. Any noise or oscillation on the “D.C. power source” is coupled through “C” which develops a signal across the LED. Even small unwanted sig- nals can cause a large change in the LED forward current. Once the LED’s forward current equals or exceeds 500 microamperes, the output circuitry will conduct indicating the presence of the unwanted signal. Transient Detection The detection of the presence or absence of waveforms can easily be detected by the circuit in Figure 2. Figure 2. Pulse or Waveform Detection Circuit For the detection of the presence of a desired signal, pulse or waveform use: CR=Silicon diode X=Non-Latching output circuitry to follow LED=Input diode of 6N139 f=frequency Examples: A desired pulse train to be present is shown in Figure 3. D.C. POWER SOURCE R - + C 6N139 X LED R Power supply voltage 1.5 volts – 50 microamperes ------------------------------------------------------------------------------- = INPUT RS RL CR C X 6N139 LED R L Positive Vpk. of input () 2.5 volts – 1 milliampere ------------------------------------------------------------------------------------ = C min Pulse interval of 1/f R L ----------------------------------------------- = R Smax Pulse width or 1/4f 5C --------------------------------------------- = |
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