OPA4872MDREP datasheet(12/24 Pages) TI

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2-BIT HIGH-SPEED PGA

50W

+5V

50W

523W

OPA695

-5V

+5V

50W

511W

OPA695

-5V

+5V

50W

453W

149W

OPA695

-5V

+5V

-5V

+5V

50W

402W

57.6W

OPA4872

OPA695

-5V

50W

To50

Load

Logic

IN0

IN1

IN2

IN3

A0 A1

523W

G=1V/V

G=2V/V

G=4V/V

G=8V/V

OPA4872-EP

SBOS444 – DECEMBER 2008........................................................................................................................................................................................... www.ti.com

When channel 0 is selected, the overall gain to the

matched load of the OPA4872 is 0dB. When channel

The OPA4872 can be used as a 2-bit, high-speed

1 is selected, this circuit delivers 6 dB of gain to the

programmable gain amplifier (PGA) when used in

matched load. When channel 2 is selected, this circuit

conjunction with another amplifier. Figure 28 shows

delivers 12 dB of gain to the matched load. When

one OPA695 used in series with each OPA4876 input

channel 3 is selected, this circuit delivers 18 dB of

and configured with gains of +1 V/V, +2 V/V, +4 V/V,

gain to the matched load.

and +8 V/V, respectively.

Figure 28. 2-Bit, High-Speed PGA, Greater Than 300MHz Channel Bandwidth

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OPA4872MDREP Datasheet(PDF) 12 Page - Texas Instruments

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