LM1044 datasheet(7/10 Pages) NSC

7 / 10 page

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

LM1044 Scheda tecnica(PDF) 7 Page - National Semiconductor (TI)