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AD813ARZ-14 Datasheet(PDF) 18 Page - Analog Devices |
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AD813ARZ-14 Datasheet(HTML) 18 Page - Analog Devices |
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18 / 19 page  AD813 REV. B –18– Single Supply Differential Line Driver Due to its outstanding overall performance on low supply volt- ages, the AD813 makes possible exceptional differential trans- mission on very low power. The circuit of Figure 59 will convert a single-ended, ground referenced signal to a differential signal whose common-mode reference is set to one half the supply voltage. This allows for a greater than 2 V peak-to-peak signal swing on a single 3 V power supply. A bandwidth over 30 MHz is achieved with 20 mA of output drive on only 30 mW of quies- cent power (excluding load current). +3V 715 715 1 F 2 11 1 F 715 715 3 715 715 1 F VIN 715 715 RL2 VOUT– 1 4 715 10k 9k 1k +3V 1 F RL1 VOUT+ Figure 59. Single 3 V Supply Differential Line Driver with 2 V Swing 10 90 100 0% 1V 1V 50ns VIN VOUT+ – VOUT– Figure 60. Differential Driver Pulse Response (VS = 3 V, RL1 = RL2 = 200 Ω) 3:1 Video Multiplexer Wiring the amplifier outputs together will form a 3:1 mux with outstanding gain flatness. Figure 55 shows a recommended configuration which results in –0.1 dB bandwidth of 20 MHz and OFF channel isolation of 60 dB at 10 MHz on ±5 V sup- plies. The time to switch between channels is about 180 ns. Switching time is only slightly affected by signal level. 10 90 100 0% 5V 500mV 500ns Figure 56. Channel Switching Characteristic for the 3:1 Mux 100k 1M 100M 10M FREQUENCY – Hz –50 –30 –40 –60 –70 –80 –90 –20 –10 –100 –110 Figure 57. 3:1 Mux OFF Channel Feedthrough vs. Frequency 1 10 100 FREQUENCY – MHz –0.5 –3.0 0.5 0 –1.0 –1.5 –2.0 –2.5 0 –45 –90 –135 –180 GAIN PHASE Figure 58. 3:1 Mux ON Channel Gain and Phase vs. Frequency |
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