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OPA875IDGKRG4 Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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OPA875IDGKRG4 Datasheet(HTML) 9 Page - Burr-Brown (TI) |
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9 / 21 page  www.ti.com APPLICATIONS INFORMATION 1-BIT HIGH-SPEED PGA TRANSMIT/RECEIVE SWITCH HIGH ISOLATION RGB VIDEO MUX 50W 57.6W 50W OPA875 x1 x2 x1 IN 50W Source 50W Load 50W 50W OPA695 Channel0 Channel1 523W OPA695 402W +5V +5V -5V -5V +5V -5V OPA875 x1 x2 x1 ReceiveChannel Channel0 Channel1 OPA875 SBOS340 – DECEMBER 2006 The OPA875 can be used as a 1-bit, high-speed The OPA875 can be used as a transmit/receive programmable gain amplifier (PGA) when used in switch in which the receive channel is disconnected, conjunction with another amplifier. Figure 25 shows when the OPA875 is switched from channel 0 to the OPA695 used twice with one amplifier configured channel 1, to prevent the transmit pulse from going in a unity-gain structure, and the other amplifier through the receive signal chain. This architecture is configured in a gain of +8V/V. shown in Figure 26. When channel 0 is selected, the overall gain to the matched load of the OPA875 is 0dB. When channel 1 is selected, this circuit delivers an 18dB gain to the Three OPA875s can be used as a triple, 2:1 video matched load. MUX (see Figure 27). This configuration has the advantage of having higher R to G to B isolation than a comparable and more integrated solution does, such as the OPA3875, especially at higher frequencies. This comparison is shown in Figure 28. Figure 25. 1-Bit, High-Speed PGA Figure 26. Transmit/Receive Switch 9 Submit Documentation Feedback |
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