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LM1044 データシート(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1044
部品情報  Analog Video Switch
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1044 データシート(HTML) 7 Page - National Semiconductor (TI)

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Application Notes (Continued)
TLH9252 – 7
FIGURE 2 LM1044 Basic Application Circuit
Relation of Clamp Pulse to Video
TLH9252 – 4
If the clamp pulse input is held low the RGB inputs may be
driven directly with DC coupled signals provided the levels
are such as to remain within the output window Such sig-
nals could be directly coupled from the RGB outputs of a
preceeding LM1044 avoiding the need for coupling capaci-
tors when expanding the switching capability External resis-
tive biasing to the bias voltage available at pin 13 may also
be used for a mean level bias with AC coupled signals not
having reference levels
OPERATION AT SUPPLIES OTHER THAN 12V
The LM1044 may be operated at supply voltages between
8V and 16V Note that the CV and RGB bias voltages to-
gether with the clamp pulse threshold will track with supply
variations whilst the logic input thresholds will remain essen-
tially constant At lower supply voltages the signal handling
may be optimized with an external bias voltage to pin 14
7


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