STV2237D datasheet(21/76 Pages) STMICROELECTRONICS

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STV223XD/224XC - FUNCTIONAL DESCRIPTION

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signals above 70 IRE, the APR will decrease the

RGB gain so that amplitude at the RGB output is

always 3 V (B/W). The APR gain control voltage is

memorized on an external capacitor where the

gain decrease is very fast and the gain increase is

very slow (several frames). The APR function can

be enabled or disabled via the I²C bus.

3.5 CHROMA CIRCUIT

PAL/SECAM/NTSC Decoders

SVHS Chroma input; bus-controlled SVHS mode.

– 30 dB ACC range.

– Integrated chroma base band delay line and ON/

OFF bus control.

– Automatic standard identification, with possibility

of forcing the standard via the bus.

– 3-crystal application capability for the South

American market:

The first crystal on Pin XTAL1 (3.5X MHz only),

he second crystal on Pin XTAL2 (3.5X MHz on-

ly), and the third crystal on Pin XTAL3/BTUN

(3.5X MHz only, used for PAL/NTSC application

only).

PAL/NTSC Decoder

ACC carried out by peak detector on synchronous

demodulation of the burst.

Fully-integrated killer function.

VCO using two standard crystals: 4.43 MHz and

3.58 MHz. One crystal is internally selected de-

pending on the standard selection. A third crystal

can be used in PAL/NTSC applications only.

VCO reference signal is available on Pin X1.

– 4.433619 MHz XTAL specification.

Mode of operation: serial resistance (without

load capacity),

Motional capacitance: CM = 13fF ±3fF,

Shunt capacitance: CP < 7pF,

Serial resistance: RS < 70Ω.

– 3.579545 MHz XTAL specification (NTSC M).

Mode of operation: serial resistance (without

load capacity),

Motional capacitance: CM = 11fF ±3fF,

Shunt capacitance: CP < 7 pF,

Serial resistance: RS < 70 Ω.

– 3.575611 MHz XTAL specification (PAL M).

Mode of operation: serial resistance (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 resistance (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.

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°.

SECAM Decoder

The following functions are fully-integrated: Killer,

PLL demodulator and De-emphasis functions.

3.6 CHROMA STANDARD IDENTIFICATION

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.

PAL/NTSC Priority

SECAM mode is locked after two identified SE-

CAM sequences.

SECAM mode can be selected in 50 Hz mode on-

ly.

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

Search mode.

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