OPA3875
www. ti. com SBOS341D – DECEMBER 2006 – REVISED AUGUST 2008
Triple 2:1 High-Speed Video Multiplexer
FEATURES
1
•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/µs 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
+5V
75W
75W
RGB
Channel 0 75W
75W
OPA3875
75W
(Patented)
75W
RGB
Channel 1
75W
75W
RGB Out
75W
-5V
EN
Channel
Select
RGB Switching
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 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 required, consider the OPA875.
SELECT 1 0 X
ENABLE 0 0 1
OPA3875
RED O...
OPA3875 PDF File
