STV2118B datasheet(5/25 Pages) STMICROELECTRONICS

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FUNCTIONAL DESCRIPTION (continued)

4 - CHROMA CIRCUIT

4.1 - PAL/SECAM/NTSC Decoders

- SVHS inputs ; bus controlled SVHS mode.

- 30dB range ACC

- Use of an external base band delay line

(STV2180 recommended)

- Automatic standard identification, with possibility

to force the standard through the bus.

4.2 - PAL/NTSC Decoders

- ACC done by peak detector on synchronous de-

modulation of the burst

- Fully integrated killer functions.

- VCO using two standard crystals : 4.43MHz and

3.58MHz. One crystal is internally selected de-

pending on the standard selection.

XTAL SPECIFICATION :

Frequency :

4.433619MHz (PAL/SECAM)

3.579545MHz (NTSC M)

3.575611MHz (PAL M)

3.582056MHz (PAL N)

Vibration mode : Fondamental, series resonance

(no serial capacitor)

Motional capacity : 13fF

±3fF

Resonance resistance : < 70

Ω

Shunt capacitance : < 7pF

Spurious response : No resonance at 3*fo

±3kHz

-0

o and

±90o demodulationangles for PAL

-(0

o,90o)or (0o,104o) = demodulation angles for

NTSC. The selection of 90

o or 104o is made

through the bus.

- Bus control Hue adjustment in NTSC mode.

4.3 - SECAM Decoder

- ACC

- Fully integrated killer

- Two integrated discriminators with two PLL

- Integrated deemphasis

4.4 - Standard Identification

- Sequential identification.

- 3 identification sequences : XTAL1 (4.43MHz)

mode to identify either PAL or NTSC, XTAL2

(3.58MHz) mode to identify either PAL or NTSC,

SECAM mode (XTAL1 selection).

- PAL/NTSC priority

- the SECAM mode is locked after two identified

SECAM sequences

- the SECAM mode can be selected in 50Hz only

- Blanking of the (R-Y) and B-Y) outputs during

color search mode.

5 - OTHER FUNCTIONS : IF CONTROLS

5.1 - Volume Control and Mute

The volume control voltage range on Pin 10 is from

0.5V to 5V. A low voltage on Pin 10 (below 0.2V)

will mute the FM demodulator of the IF circuit

STV8224. It will put the volume at the minimum

level and thus there will be no sound either in TV

mode or SCART mode.

The volume control voltage and the mute level are

controlled by the bus.

5.2 - IF Standard and TV/SCART Mode Selection

The selection of IF standard (positive or negative

vision modulation) and theTV/SCART mode is con-

trolled by the bus. The selection is converted in four

voltages on Pin 21.

The lowest voltage selects the TV mode and the

NEGATIVE vision modulation.

The highest voltage (open collector output with

internal pull-up resistor to VCC) selects the SCART

mode and the NEGATIVE vision modulation.

The two other intermediate voltages select either

TV mode and POSITIVE vision modulation or

SCART mode and POSITIVE vision modulation.

STV2118B

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