LMH6714, LMH6720

LMH6722, LMH6722-Q1

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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