Datasheet

MULTIPLEXED CONVERTER DRIVER
1/3
OPA3832
400W400W
100W
V
1
1/3
OPA3832
400W400W
100W
V
2
1/3
OPA3832
400W400W
100W
V
3
Selection
Logic
ADS826
10-Bit
60MSPS
0.1mF
0.1mF
4.99kW
0.1mF
4.99kW
0.1mF
100pF
REFT
+3.5V
REFB
+1.5V
+In
-In
CM
MultiplexedConverterDriver
OPA3832
www.ti.com ............................................................................................................................................ SBOS370A – DECEMBER 2006 – REVISED AUGUST 2008
The output resistors isolate the outputs from each
other when switching between channels. The
The converter driver in Figure 53 multiplexes among
feedback network of the disabled channels forms part
the three input signals. The OPA3832s enable and
of the load seen by the enabled amplifier, attenuating
disable times support multiplexing among video
the signal slightly.
signals. The make-before-break disable characteristic
of the OPA3832 ensures that the output is always
under control. To avoid large switching glitches,
switch during the sync or retrace portions of the video
signal — the two inputs should be almost equal at
these times. The output is always under control, so
the switching glitches for two 0V inputs are < 20mV.
With standard video signals levels at the inputs, the
maximum differential voltage across the disabled
inputs will not exceed the ± 1.2V maximum rating.
Figure 53. Multiplexed Converter Driver
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