OM8373 datasheet(2/108 Pages) PHILIPS

2 / 108 page

2004 Jan 15

Philips Semiconductors

Tentative Device Speciﬁcation

TV signal processor- Closed Caption

decoder with embedded

µ-Controller

OM8373; OM8378

GENERAL DESCRIPTION

The OM8373 and OM8378 combine the functions of a

video processor together with a

µ-Controller and US

Closed Caption decoder. The ICs are intended to be used

in economy television receivers with 110

° picture tubes.

The ICs have supply voltages of 8 V and 3.3 V and they

are mounted in a SDIP-64 envelope.

The features are given in the following feature list.

FEATURES

TV-signal processor

• Vision IF circuit suitable for negative modulation with

alignment-free PLL demodulator

• Internal (switchable) time-constant for the IF-AGC circuit

• The mono intercarrier sound circuit has a selective

FM-PLL demodulator which can be switched to the

different FM sound frequencies (4.5/5.5/6.0/6.5 MHz).

The quality of this system is such that the external

band-pass filters can be omitted.

• Source selection between the ‘internal’ CVBS and an

external CVBS or Y/C signal

• 1 external audio input.

• Integrated chrominance trap circuit

• Integrated luminance delay line with adjustable delay

time

• Picture improvement features with peaking (with

switchable centre frequency, depeaking, variable

positive/negative overshoot ratio and video dependent

coring), dynamic skin tone control and blue- and black

stretching. All features are available for CVBS, Y/C and

YPBPR signals.

• Tint control for all internal and external signals

• Integrated chroma band-pass filter with switchable

centre frequency

• Only one reference (12 MHz) crystal required for the

µ-Controller and the colour decoder

• NTSC or PAL/NTSC colour decoder with automatic

search system

• Internal base-band delay line

• Indication of the Signal-to-Noise ratio of the incoming

CVBS signal

• A linear RGB/YUV/YPBPR input with fast blanking for

external RGB/YUV sources. The synchronisation circuit

can be connected to the incoming Y signal. The OSD

signals are internally supplied from the

µ-Controller.

• RGB control circuit with ‘Continuous Cathode

Calibration’, white point and black level off-set

adjustment so that the colour temperature of the dark

and the light parts of the screen can be chosen

independently.

• 2 levels of contrast reduction of main picture possible

during OSD/Text insertion (‘halftone’)

• OSD/Text gain reduction control

• Adjustable ‘wide blanking’ of the RGB outputs

• Horizontal synchronization with two control loops and

alignment-free horizontal oscillator

• Vertical count-down circuit

• Vertical driver optimized for DC-coupled vertical output

stages

• Horizontal and vertical geometry processing

• Horizontal and vertical zoom function for 16 : 9

applications

• Horizontal parallelogram and bow correction for large

screen picture tubes

• Low-power start-up of the horizontal drive circuit

• Macrovision keying possibility for horizontal

synchronisation.

OM8373 Datasheet(PDF) 2 Page - NXP Semiconductors

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