STV2236 datasheet(25/86 Pages) STMICROELECTRONICS

25 / 86 page

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STV224X, STV228X, STV223X - FUNCTIONAL DESCRIPTION

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Shunt capacitance: CP < 7 pF,

Serial resistance: RS < 70 Ω.

– 3.575611 MHz XTAL specification (PAL M).

Mode of operation: serial resonance (without

load capacity),

Motional capacitance: CM = 12fF ±2fF,

Shunt capacitance: CP < 7pF,

Serial resistance: RS < 70Ω.

– 3.582056 MHz XTAL specification (PAL N).

Mode of operation: serial resonance (without

load capacity),

Motional capacitance: CM = 12fF ±2fF,

Shunt capacitance: CP < 7pF,

Serial resistance: RS < 70Ω.

0° and ± 90° demodulation angles for PAL.

Bus-controlled demodulation angles (0, 90) or (0,

104) are available in NTSC mode.

Bus-controlled Hue adjustment is available in

NTSC mode.

3.5.2.1 NTSC Automatic Flesh Control

Two automatic flesh control characteristics are

available via the bus.The normal flesh control with

±10° correction and a total action range of ±60°

and the wide flesh control with ±20° correction and

a total action range of ±90°.

3.5.3 SECAM Decoder

The following functions are fully-integrated: Killer,

PLL demodulator and De-emphasis functions.

3.5.4 Chroma Standard Identification

R-Y and B-Y outputs are blanked during Color

Search mode. The color is displayed only when

the chroma standard has been identified.

3.5.4.1 Sequential Identification

Three identification sequences:

– XTAL1 (4.43 MHz) mode to identify either PAL or

NTSC.

– XTAL2 (3.58 MHz) mode to identify either PAL or

NTSC.

– SECAM mode (XTAL1 selection).

In 3-crystal applications, the SECAM sequence is

replaced by XTAL3 selection to identify either PAL

or NTSC signals.

3.5.4.2 SECAM Identification

SECAM mode is locked after two identified SE-

CAM sequences.

SECAM mode can be selected in 50 Hz mode on-

ly. PAL/NTSC has priority over SECAM standard.

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