Datasheet

OPA691
13
SBOS226D
www.ti.com
FIGURE 4. 2-Channel Video Multiplexer.
also ensures that the maximum differential voltage across
the inputs of the unselected channel do not exceed the rated
±1.2V maximum for standard video signal levels.
The section on Disable Operation shows the turn-on and
turn-off switching glitches using a grounded input for a single
channel is typically less than ±50mV. Where two outputs are
switched (see Figure 6), the output line is always under the
control of one amplifier or the other due to the “make-before-
break” disable timing. In this case, the switching glitches for
two 0V inputs drop to < 20mV.
4-CHANNEL FREQUENCY CHANNELIZER
The circuit of Figure 5 is a 4-channel multiplexer. In this
circuit the OPA691 provides the drive for all 4 channels.
OPA691
V
OUT
75Ω Cable
75Ω Load
RG-59
75Ω
402Ω
OPA691
75Ω
59Ω
R
O
R
O
R
O
R
O
#1
DIS 1
OPA691
75Ω
75Ω
402Ω
59Ω
#2
DIS 2
OPA691
75Ω
75Ω
59Ω
#3
DIS 3
+5V
–5V
+5V
–5V
+5V
–5V
+5V
–5V
+5V
–5V
OPA691
75Ω
75Ω
59Ω
#4
DIS 4
402Ω
402Ω
402Ω
402Ω
402Ω
402Ω
OPA691
2kΩ
82.5Ω
75Ω Cable
RG-59
82.5Ω
402Ω340Ω
Video 1
+5V
+5V
–5V
OPA691
2kΩ
75Ω
402Ω340Ω
Video 2
–5V
+5V
75Ω
V
DIS
DIS
DIS
FIGURE 5. 4-Channel Frequency Channelizer.