MULTIPLEXED CONVERTER DRIVER

1/3

OPA3832

400W

400W

100W

V

1

1/3

OPA3832

400W

400W

100W

V

2

1/3

OPA3832

400W

400W

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

MultiplexedConverterDriver

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

Copyright © 2006–2008, Texas Instruments Incorporated

Submit Documentation Feedback

21

Product Folder Link(s): OPA3832