1FEATURES

2· 700MHz SMALL-SIGNAL BANDWIDTH

(AV = +2)

· 425MHz, 4VPP BANDWIDTH

· 0.1dB GAIN FLATNESS to 150MHz

· 4ns CHANNEL SWITCHING TIME

· LOW SWITCHING GLITCH: 40mVPP

· 3100V/ms SLEW RATE

· 0.025%/0.025° DIFFERENTIAL GAIN, PHASE

· HIGH GAIN ACCURACY: 2.0V/V ±0.4%

APPLICATIONS

· RGB SWITCHING

· LCD PROJECTOR INPUT SELECT

· WORKSTATION GRAPHICS

· TRIPLE ADC INPUT MUX

· DROP-IN UPGRADE TO LT1675

DESCRIPTION

The OPA3875 offers a very wideband, 3-channel, 2:1

multiplexer in a small SSOP-16 package. Using only

11mA/ch, the OPA3875 provides three, gain of +2,

video amplifier channels with greater than 400MHz large-signal bandwidth (4VPP). Gain accuracy and

switching glitch are 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. Gain matching between each of the

3-channel pairs is also significantly improved using

this technique (<0.2% gain mismatch). With greater

than 700MHz small-signal bandwidth at a gain of 2,

the OPA3875 gives a typical 0.1dB gain flatness to greater than 150MHz.

System power may be reduced using the chip enable

feature for the OPA3875. Taking the chip enable line high powers down the OPA3875 to less than 900mA

total supply current. Muxing multiple OPA3875

outputs together, then using the chip enable to select

which channels are active, increases the number of

possible inputs to the 3-channel outputs.

Where a single channel of the OPA3875 is required,

consider the OPA875.