OPA4872

BurrĆBrown Products from Texas Instruments OPA3875 SBOS341B – DECEMBER 2006 – REVISED DECEMBER 2006 Triple 2:1 High-Speed Video Multiplexer FEATURES 700MHz SMALL-SIGNAL BANDWIDTH (AV = +2) 425MHz, 4VPP BANDWIDTH 0.1dB GAIN FLATNESS to 150MHz 4ns CHANNEL SWITCHING TIME LOW SWITCHING GLITCH: 40mVPP 3100V/µs SLEW RATE 0.025%/0.025° DIFFERENTIAL GAIN, PHASE HIGH GAIN ACCURACY: 2.0V/V ±0.4% 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 > 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 >700MHz small-signal bandwidth at a gain of 2, the OPA3875 gives a typical 0.1dB gain flatness to > 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 <900µA 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 re...