LMH6714 Datasheet, PDF (13/30 Pages) National Semiconductor (TI) – Wideband Video Op Amp; Single, Single with Shutdown and Quad

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LMH6714, LMH6720
LMH6722, LMH6722-Q1
SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013
VIDEO PERFORMANCE
The LMH6714/LMH6720/LMH6722 has been designed to provide excellent performance with both PAL and
NTSC composite video signals. Performance degrades as the loading is increased, therefore best performance
will be obtained with back terminated loads. The back termination reduces reflections from the transmission line
and effectively masks capacitance from the amplifier output stage. While all parts offer excellent video
performance the LMH6714 and LMH6722 are slightly better than the LMH6720.
WIDE BAND DIGITAL PROGRAMMABLE GAIN AMPLIFIER (LMH6720 ONLY)
Figure 36. Wideband Digitally Controlled Programmable Gain Amplifier
Channel Switching
Figure 37. PGA Output
As shown in Figure 36 and Figure 37 the LMH6720 can be used to construct a digitally controlled programmable
gain amplifier. Each amplifier is configured to provide a digitally selectable gain. To provide for accurate gain
settings, 1% or better tolerance is recommended on the feedback and gain resistors. The gain provided by each
digital code is arbitrary through selection of the feedback and gain resistor values.
Copyright © 2002–2013, Texas Instruments Incorporated
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Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1