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1FEATURES

2? 500MHz SMALL-SIGNAL BANDWIDTH

? 500MHz, 2VPP BANDWIDTH

? 0.1dB GAIN FLATNESS to 120MHz

? 10ns CHANNEL SWITCHING TIME

? LOW SWITCHING GLITCH: 40mV PP

? 2300V/μs SLEW RATE

? 0.035%/0.005° DIFFERENTIAL GAIN, PHASE

? QUIESCENT CURRENT = 10.6mA

? 1.1mA QUIESCENT CURRENT IN SHUTDOWN

MODE

? 88dB OFF ISOLATION IN DISABLE OR

SHUTDOWN (10MHz)

APPLICATIONS

? VIDEO ROUTER

? LCD AND PLASMA DISPLAY

? HIGH SPEED PGA

? DROP-IN UPGRADE TO AD8174

DESCRIPTION

The OPA4872 offers a very wideband 4:1 multiplexer

in an SO-14 package. Using only 10.6mA, the

OPA4872 provides a user-settable output amplifier

gain with greater than 500MHz large-signal

bandwidth (2VPP). The switching glitch is improved

over earlier solutions using a new (patented) input

stage switching approach. This technique uses

current steering as the input switch while maintaining

an overall closed-loop design. The OPA4872 exhibits

an off isolation of 88dB in either Disable or Shutdown

mode. With greater than 500MHz small-signal

bandwidth at a gain of 2, the OPA4872 gives a typical

0.1dB gain flatness to greater than 120MHz.

System power may be optimized using the chip

enable feature for the OPA4872. Taking the chip

enable (EN) line high powers down the OPA4872 to

less than 3.4mA total supply current. Further power

reduction to 1.1mA quiescent current can be

achieved by bringing the shutdown (SD) line high. Muxing multiple OPA4872s outputs together, then

using the chip enable to select which channels are

active, increases the number of possible inputs.