OPA875 datasheet(9/18 Pages) TI

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APPLICATIONS INFORMATION

1-BIT HIGH-SPEED PGA

TRANSMIT/RECEIVE SWITCH

HIGH ISOLATION RGB VIDEO MUX

50W

57.6W

50W

OPA875

50W

Source

50W

Load

50W

OPA695

Channel0

Channel1

523W

OPA695

402W

+5V

-5V

+5V

-5V

OPA875

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

the

OPA3875,

especially

higher

frequencies. This comparison is shown in Figure 28.

Figure 25. 1-Bit, High-Speed PGA

Figure 26. Transmit/Receive Switch

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