OPA4872 Datasheet, PDF (1/27 Pages) Texas Instruments – 4:1 High-Speed Multiplexer

OPA4872
www.ti.com
SBOS346C – JUNE 2007 – REVISED MARCH 2011
4:1 High-Speed Multiplexer
Check for Samples: OPA4872
FEATURES
1
•2 500MHz SMALL-SIGNAL BANDWIDTH
• 500MHz, 2V_PP 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 (2V_PP). 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.
+5V
OPA695
50W
G = 1V/V
-5V
523W
50W
+5V
+5V
IN0
OPA4872
OPA695
-5V
511W
50W
G = 2V/V
IN1
511W
+5V
OPA695
-5V
453W
149W
+5V
OPA695
-5V
402W
IN2
50W
G = 4V/V
IN3
50W
G = 8V/V
Logic
A0 A1
-5V
SD
EN
50W
523W _{To 50W Load}
523W
57.6W
2-Bit, High-Speed PGA, Greater Than 300MHz Channel Bandwidth
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007–2011, Texas Instruments Incorporated