Modes of Operation

MC44BS374T1/374T1A Advance Information

16.8 Video Section - Peak White Clip

The MC44BS374T1/374T1A requires the following for proper video functionality:

•

A composite video input with negative going sync pulses

•

A nominal level of 1Vpp

This signal is AC-coupled to the video input where the sync tip level is clamped.

The video signal is then passed to a Peak White Clip (PWC) circuit. The PWC circuit function soft-clips

the top of the video waveform, if the sync tip amplitude to peak white clip goes too high. This avoids

carrier over-modulation by the video. Clipping can be disabled by software.

16.9 Test Pattern Generator

easily tune to the modulator output. The pattern consists of two white vertical bars on a black background

and a 976 Hz audio test signal.

Figure 8. Test Pattern Generator

10

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0

64

TE1

24 28

44

TIME IN µS.

7/10

3/10

TE2

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com