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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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OPA690 датащи(PDF) 13 Page - Texas Instruments |
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OPA690 датащи(HTML) 13 Page - Texas Instruments |
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13 / 23 page  OPA691 13 SBOS226A www.ti.com FIGURE 4. 2-Channel Video Multiplexer. also ensures that the maximum differential voltage across the inputs of the unselected channel do not exceed the rated ±1.2V maximum for standard video signal levels. The section on Disable Operation shows the turn-on and turn-off switching glitches using a grounded input for a single channel is typically less than ±50mV. Where two outputs are switched (see Figure 6), the output line is always under the control of one amplifier or the other due to the “make-before- break” disable timing. In this case, the switching glitches for two 0V inputs drop to < 20mV. 4-CHANNEL FREQUENCY CHANNELIZER The circuit of Figure 5 is a 4-channel multiplexer. In this circuit the OPA691 provides the drive for all 4 channels. OPA691 V OUT 75 Ω Cable 75 Ω Load RG-59 75 Ω 402 Ω OPA691 75 Ω 59 Ω R O R O R O R O #1 DIS 1 OPA691 75 Ω 75 Ω 402 Ω 59 Ω #2 DIS 2 OPA691 75 Ω 75 Ω 59 Ω #3 DIS 3 +5V –5V +5V –5V +5V –5V +5V –5V +5V –5V OPA691 75 Ω 75 Ω 59 Ω #4 DIS 4 402 Ω 402 Ω 402 Ω 402 Ω 402 Ω 402 Ω OPA691 2k Ω 82.5 Ω 75 Ω Cable RG-59 82.5 Ω 402 Ω 340 Ω Video 1 +5V +5V –5V OPA691 2k Ω 75 Ω 402 Ω 340 Ω Video 2 –5V +5V 75 Ω V DIS DIS DIS FIGURE 5. 4-Channel Frequency Channelizer. |
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