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MAX442CSA Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX442CSA Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page The Typical Operating Circuit shows the MAX442 dri- ving a back-terminated 75 Ω video cable. The back-ter- mination resistor (at the MAX442 output) is included to match the impedance of the cable’s driven end to the characteristic impedance of the cable itself. This, plus the load-termination resistor, eliminates signal reflec- tions from the cable’s ends. The back-termination resis- tor forms a voltage divider with the load impedance, which attenuates the signal at the cable output by one- half. The amplifier is operated with a 2V/V closed-loop gain to provide unity gain at the cable’s video output. Capacitive-Load Driving Driving large capacitive loads increases the likelihood of oscillation in most amplifier circuits. This is especial- ly true for circuits with high loop gains, like voltage fol- lowers. The amplifier’s output impedance and the capacitive load form an RC filter that adds a pole to the loop response. If the pole frequency is low enough, as when driving a large capacitive load, the circuit phase margin is degraded and oscillation may occur. With capacitive loads greater than approximately 50pF and the MAX442 configured as a unity-gain buffer, use an isolation resistor in series with the load, as shown in Figure 2. The resistor removes the pole from the loop response caused by the load capacitance. Channel Switching Time/Transient When the MAX442 multiplexer is switched from one channel to another, a small glitch will appear at the out- put. Figure 3 shows the results of putting a 0V to 5V pulse 100ns wide into A0. 140MHz, 2-Channel Video Multiplexer/Amplifier 6 _______________________________________________________________________________________ MAX442 22 Ω CLOAD > 50pF OUT IN Figure 2. Capacitive-Load-Driving Circuit A0 INPUT 5V/div AMP OUTPUT 200mV/div GND GND Figure 3. Output Switching Transient when Switching Between Two Grounded Inputs with RL = 100Ω INPUT 1V/V CABLE OUTPUT 1V/V GND GND Figure 5. Pulse Response with RL = 100Ω (50Ω back-terminated cable), AVCL = +2V/V INPUT 1V/div CABLE OUTPUT 500mV/div GND GND Figure 4. Pulse Response with RL = 100Ω (50Ω back-terminated cable), AVCL = +1V/V |
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