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OPA4872MDREP Datenblatt(PDF) 13 Page - Texas Instruments

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Teilenummer OPA4872MDREP
Bauteilbeschribung  4:1 HIGH-SPEED MULTIPLEXER
PDF  24 Pages
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

OPA4872MDREP Datenblatt(HTML) 13 Page - Texas Instruments

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2-BIT, HIGH-SPEED ATTENUATOR
8-TO-1 VIDEO MULTIPLEXER
50W
OPA4872
R
R
R
R
2R
2R
2R
To50
Load
W
523W
523W
IN0
IN1
IN2
IN3
V
IN
A0 A1
SD
EN
V
OUT
Logic
4-INPUT RGB ROUTER
R =69W
O
OPA4872
To75
Load
W
Logic
R = 69W
O
OPA4872
Logic
523W
523W
523W
523W
EN
SD
EN
SD
R =Z ||(
+R +R )
O
F
G
O
O
R
1+
=2
R
F
R
G
(1)
75W
+5V
-5V
OPA4872
To75
Load
W
Logic
R
2
R
1
R
3
R
4
RedOut
A0 A1
523W
523W
EN
SD
R +R
=1046
R =R
W
F
G
F
G
(2)
OPA4872-EP
www.ti.com........................................................................................................................................................................................... SBOS444 – DECEMBER 2008
In
contrast
to
the
PGA,
a
two-bit
high-speed
Two OPA4872s can be used together to form an
attenuator can be implemented by using an R-2R
8-input video multiplexer. The multiplexer is shown in
ladder together with the OPA4872. Figure 29 shows
Figure 31.
such an implementation.
Channel 0 sees the full input signal amplitude, where
as channel 1 sees 1/2 VIN, channel 2 see 1/4 VIN and
channel 3 sees 1/8 VIN.
Figure 29. 2-Bit, High-Speed Attenuator,
500MHz Channel Bandwidth
Three OPA4872s can be used together to form a
four-input RGB router. The router for the red
component is shown in Figure 30. Identical stages
would be used for the green and blue channels.
Figure 31. 8-to-1 Video Multiplexer
When
connecting
OPA4872
outputs
together,
maintain a gain of +1V/V at the load. The OPA4872
configuration shown is a gain of +6 dB; thus, the
matching resistance must be selected to achieve
–6 dB.
The set of equations to solve is shown in Equation 1
and Equation 2. Here, the impedance of interest is
75
Ω.
Figure 30. 4-Input RGB Router
(Red Channel Shown)
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): OPA4872-EP



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