MC44BS373CADR2 datasheet(24/52 Pages) FREESCALE

Part #	MC44BS373CADR2

Description	PLL-Tuned UHF and VHF Audio/Video High-Integration Modulator

PDF	52 Pages

Scroll/Zoom	100%

Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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24 / 52 page

MC44BS373CA Data Sheet

MC44BS373CA Modes of Operation

Figure 6. Typical Attenuator Application with Pin Diode

15.9 Video Section—Peak White Clip

The MC44BS373CA requires the following for proper video functionality:

•

A composite video input with negative going sync pulses

•

A nominal level of 1 Vp-p

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.

15.10 Test Pattern Generator

The I2C generates a simple test pattern, which can be switched under bus control to permit a TV receiver to

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 7. Test Pattern Generator

LOP pin

Vcc

TV Out

Antenna

Input

TE1

24 28

TIME INµS.

7/10

3/10

TE2

MC44BS373CADR2 Datasheet(PDF) 24 Page - Freescale Semiconductor, Inc