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AD8074ARU датащи(PDF) 11 Page - Analog Devices |
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AD8074ARU датащи(HTML) 11 Page - Analog Devices |
11 / 16 page REV. A AD8074/AD8075 –11– Triple Video Multiplexer The AD8074 and AD8075 each have an output-enable function that can be used to disable the outputs and put them in a high- impedance state. Usually, for a unity-gain device, it is relatively easy to provide high disabled impedance, because the feedback path is from the output to a high-impedance input. However, for a non-unity-gain part, the feedback provides a resistive path to ground. This will usually dominate the disabled output imped- ance, and make it a much lower value than the unity-gain device. The AD8075 has an internal buffer that provides a low-impedance, ground level output that terminates the feedback path during enabled operation. In the disabled state, both this buffer output and the amplifier output are disabled to a high impedance to provide a high-impedance disabled state. To construct a multiplexer, the outputs from one or more devices are connected in parallel and only one device is enabled at a time while all of the others are disabled. The two sets of inputs are applied individually to each of the separate device inputs. Figure 4 shows the circuit details for this function. The first RGB Source 1 is input to the first AD8075. Each of the individual signals is terminated to ground with 75 Ω to provide proper termination for the input cables. In a similar fashion, the Source 2 signals are input to the second AD8075. 0.1 F –5V 0.1 F –5V 0.1 F –5V + 25 F 0.1 F +5V 0.1 F +5V 0.1 F +5V + 25 F AD8075 75 75 75 OE 75 75 75 R G B SOURCE 2 0.1 F –5V 0.1 F –5V 0.1 F –5V + 25 F 0.1 F +5V 0.1 F +5V 0.1 F +5V + 25 F AD8075 75 75 75 OE 75 75 75 R G B SOURCE 1 SEL1/ SEL2 R G B OUTPUT Figure 4. Mux |
Аналогичный номер детали - AD8074ARU |
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Аналогичное описание - AD8074ARU |
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