OM8373 datasheet(48/108 Pages) PHILIPS

48 / 108 page

2004 Jan 15

Philips Semiconductors

Tentative Device Speciﬁcation

TV signal processor-Teletext decoder with

embedded

µ-Controller

OM8373; OM8378

TO LUMA/SYNC PROCESSING

TO CHROMA PROCESSING

CVBS2/Y

CVBS1

VIM

VIDEO IDENT

IDENT

Fig.21 CVBS switch and interfacing of video ident

(+)

IFVO

IFVO/SVO

SVO

Synchronisation circuit

The IC contains separator circuits for the horizontal and

vertical sync pulses and a data-slicing circuit which

extracts the digital closed caption data from the analog

signal.

The horizontal drive signal is obtained from an internal

VCO which is running at a frequency of 25 MHz. This

oscillator is stabilised to this frequency by using a 12 MHz

signal coming from the reference oscillator of the

µ-Controller.

The horizontal drive is switched on and off via the soft

start/stop procedure. This function is realised by means of

variation of the TON of the horizontal drive pulses. In

addition the horizontal drive circuit has a ‘low-power

start-up’ function.

The vertical synchronisation is realised by means of a

divider circuit. The vertical ramp generator needs an

external resistor and capacitor. For the vertical drive a

differential output current is available. The outputs must be

DC coupled to the vertical output stage.

The following geometry parameters can be adjusted:

• Horizontal shift

• Vertical amplitude

• Vertical slope

• S-correction

• Vertical shift

• EW width

• EW parabola width

• EW upper and lower corner parabola correction

• EW trapezium correction

• Vertical zoom

• Horizontal parallelogram and bow correction.

When the vertical amplitude is compressed (zoom

factor <1) it is still possible to display the black current

measuring lines in the overscan. This function is activated

by means of the bit OSVE in subaddress 26H.

OM8373 Datasheet(PDF) 48 Page - NXP Semiconductors

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