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8_to_1_video_switch_amplifier

2016-09-13 12:56  
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8_to_1_video_switch_amplifier
This circuit uses two CA3256 ICs to provide an 8-to-1 video-switch function. The analog switches of channels 1 to 8 are digitally controlled by logic, as shown in the truth table. As in the case of the switch circuits shown in Figs. 3-35 through 3-37, the circuit of Fig. 3-38 has programmable gain for all channels, as well as flexible output-voltage swing. Typically, the output voltage swing can be about 5 Vpp, with a Vcc to VEE range of 12 V or greater, and each amplifier can provide a gain of 1 into a 75-Ω load, or a gain of 5 into a 1-kΩ load.