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STV2116A

BUS CONTROLLED PAL/NTSC TV PROCESSOR

STMicroelectronics 

STV2116A

FUNCTIONAL DESCRIPTION (continued)

3 - VIDEO CIRCUIT

- 2 RGB inputs : RGB (OSD) input has priority

against the RGBext. Maximum contrast on RGB

(OSD). -10dB range contrast control on RGBext.

Possibility to disable the RGBext insertion

through the bus.

- Oversize blanking capability on FB(OSD)(Pin15)

input. The RGB ouputs will be blanked when the

voltage on Pin 15 will exceed the second thresh-

old at 1.9V (blanking threshold) : the whole field

is blanked but not the inserted cut-off pulses. The

OSD insertion threshold is 0.7V.

- Automatic cut-off current loop : 2V cut-off range.

Sequential cut-off current measurement during

the three lines after the frame blanking signal.

Leakage current measurement during the frame

blanking, memorization on an internal capacitor.

- Possibility to force through the bus the inserted

cut-off pulses on lines 23/24/25(CCIR) in 50Hz

and 60Hz mode.

- Warm up detector.

- Beam current limiter DC voltage input.

The beam current limiter control voltage will act

on contrast first, then the brightness will be de-

creased when contrast attenuationreaches -5dB.

- Bus control of the red, green and blue channel

gain (White point adjustment)

- Bus control of the red and green DC levels (black

point adjustment)

- PAL matrix, specific NTSC matrix when demodu-

lation angles are (0o, 104o).

- Switch-off of the trap filter in SVHS mode.

- Bus controlled contrast on luminance

(20dB range)

- Bus controlled saturation (50dB range)

- Bus controlled brightness : 40% range at maxi-

mum contrast.

- Bus controlled sharpness (peaking).

- Noise coring function on sharpness.

- Bus controlled blue screen feature

4 - CHROMA CIRCUIT

4.1 - PAL/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.

- 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-

4/24

pending on the standard selection.

- 3 crystals application capability : one crystal on

Pin XTAL1 (4.43MHz or 3.58MHz), two crystals

on Pin XTAL 2 (3.58MHz only) which can be

selected by Pin 9 out signal.

XTAL SPECIFICATION :

Frequency : 4.433619MHz (PAL)

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 : < 70Ω

Shunt capacitance : < 7pF

Spurious response : No resonance at 3*fo ±3kHz

- 0o and ±90o demodulation angles for PAL

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

NTSC. The selection of 90o or 104o is made

through the bus.

- Bus control Hue adjustment in NTSC mode.

- NTSCautomaticfleshcontrol.Buscontrolleddisable.

- Switchable chroma demodulator gain (+6dB) for

NTSC only application, when no external chroma

delay line is used.

4.2 - Standard Identification

- Sequential identification.

- 3 identification sequences : XTAL1 (4.43MHz)

mode to identify either PAL or NTSC, XTAL2

(3.58MHz)modeto identifyeitherPALor NTSC, no

SECAMsignalchecking. In case of singlestandard

operation,we recommendto force this standardby

the bus which permits the use of only one crystal.

- 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 0.1V)

will mute the FM demodulator of the IF circuit

(STV8223). Thus there will be no sound either on

the speaker or an audio output plug.

The volume control voltage and the mute level are

controlled by the bus.

5.2 - TV/SCART Mode Selection

The selection of the TV/External (AV) mode is

controlled by the bus. The selection is converted in

two voltages on Pin 11.

The lowest voltage selects the TV mode.

The highest voltage (open collector output with

internal pull-up resistor to VCC) selects the External

(AV) mode.

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