LMH6733 Datasheet, PDF (14/25 Pages) Texas Instruments – Single Supply, 1.0 GHz, Triple Operational Amplifier

LMH6733
SNOSAW0D – JANUARY 2007 – REVISED MAY 2013
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+ V_SUPPLY
6.8 PF
C2
0.1 PF
R_IN
75:
V_IN
R_G
340:
C1
X1
++
--
R_F
340:
0.1 PF
R_OUT
75:
V_OUT
- V_SUPPLY
C3
6.8 PF
C4
Figure 37. Typical Video Application
R_IN
R_G
51: 340:
X1
++
--
R_F
340:
R_OUT
51:
C_L
10 pF
R_L
1 k:
Figure 38. Decoupling Capacitive Loads
Driving Capacitive Loads
Capacitive output loading applications will benefit from the use of a series output resistor R_OUT. shows the use of
a series output resistor, R_OUT, to stabilize the amplifier output under capacitive loading. Capacitive loads of 5 to
120 pF are the most critical, causing ringing, frequency response peaking and possible oscillation. The chart
“Frequency Response vs. Capacitive Load” give a recommended value for selecting a series output resistor for
mitigating capacitive loads. The values suggested in the charts are selected for .5 dB or less of peaking in the
frequency response. This gives a good compromise between settling time and bandwidth. For applications where
maximum frequency response is needed and some peaking is tolerable, the value of R_OUT can be reduced
slightly from the recommended values.
CAT5 High Definition Video Transmission
The LMH6733 can be used to send component 1080i High Definition (HD) video over CAT5 twisted-pairs. As
shown Figure 39 , the LMH6733 can be utilized to perform all three video transmitter, video receiver, and
equalization circuitry. The equalization circuitry enhances the video signal to accomodate for the CAT5
attenuation over various cable lengths. Refer to application note AN-1822 for more details regarding this
application.
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