LM1044 datasheet(8/10 Pages) NSC

8 / 10 page

Application Notes (Continued)

TLH9252 – 5

FIGURE 3 LM1044 Application Circuit Showing System Interfacing and LM1038

OPERATION WITH SPLIT SUPPLIES

The LM1044 may be operated with split supplies with due

regard to the maximum supply voltage (16V) and output sig-

nal range An example of operation in this way is illustrated

below With g5V and pin 14 held at 0V the RGB outputs

can swing a2V b15V and the CV and Sync output can

swing a13V b13V Similarly with a10V b5V supplies

pin 14 to 0V RGB output swings of a55V b15V and CV

Sync swings of a45V and b15V can be obtained This

supply configuration has the advantage that pin 14 can be

grounded and all signals may be DC coupled avoiding the

need for coupling capacitors Offsets introduced are typical-

ly b30 mV for CV and RGB channels and b140 mV for

Sync channels

OTHER APPLICATIONS

The LM1044 can be used in other than the standard CV with

RGB circuit and an example is given below of a dual 6 input

to 1 output multiplexer for video or indeed any kind of sig-

nals up to 2 Vp-p In this particular example the RGB outputs

are cross-coupled into the CV inputs of the other channel to

complete the multiplexing down to 2 outputs The clamp

circuits are disabled to allow direct drive on the inputs Such

circuits are ideal for security cameras and other multiple

video source monitoring systems

LM1044 Datasheet(PDF) 8 Page - National Semiconductor (TI)