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STV2246H

I2C BUS-CONTROLLED MULTISTANDARD SINGLE CHIP TV PROCESSOR

STMicroelectronics 

STV224XH/228XH/223XH - MAIN FEATURES

2 MAIN FEATURES

■ I²C Bus control (Read and Write modes).

■ PLL PIF demodulator, bus-controlled VCO

alignment.

■ Positive and negative IF modulation.

■ Digital AFC.

■ Tuner-delayed AGC output.

■ White and Black Spot cancellation.

■ SIF with QSS structure.

■ Intercarrier capability.

■ Built-in sound bandpass.

■ Multistandard PLL FM Demodulator (4.5, 5.5,

6.0, 6.5 MHz).

■ Audio FM Wide mode (BGDKI): Capable of

demodulating ±400 kHz overmodulated audio

signals, to be used in QSS architecture.

■ AM demodulator for France.

■ Sound subcarrier output for Stereo chassis: FM

and NICAM carriers.

■ Audio switch for external audio input, Mono

chassis.

■ Digital volume control.

■ Audio Mute.

■ Automatic Volume Levelling (AVL) on audio

signal (internal or external audio).

■ Digital buffer for SAW filter switching.

■ Video switch, three Composite Video

Broadcasting Signal (CVBS) inputs and two

CVBS outputs (which can be used to drive a

teletext decoder).

■ SVHS switch, Y input is combined with CVBS3

input.

■ Capability to output Y+C signal on second

CVBS output.

■ OSD RGB analog inputs, fast blanking

detection on fast blanking OSD pin, contrast

control capability.

■ Half-contrast control pin.

■ External analog RGB inputs with contrast and

saturation control (external RGB matrixed in

YUV). External analog YCrCb inputs can be

connected to the same inputs. In this case, the

sync signal must be sent to the CVBS input, and

External YCrCb mode must be selected through

the I²C bus.

■ Y,U,V inputs outputs: Y,U,V inputs/outputs for

the use of enhanced picture ICs.

■ Integrated chroma filters (trap, bandpass, bell)

with automatic alignment.

■ Integrated luminance delay line.

■ Adjustable peaking on the luminance signal with

coring function.

■ Black Stretch circuit.

■ Automatic RGB peak regulation (APR) or RGB

peak limitation.

■ PAL/SECAM/NTSC color decoder with

automatic identification of standards.

■ Integrated chroma delay line.

■ Full integrated SECAM decoder.

■ Hue control, 2 selectable matrices in NTSC

mode.

■ Automatic Flesh Control circuit with two

selectable characteristics (normal and wide).

■ Automatic Color Control (ACC) overload circuit.

■ Chroma subcarrier output which could be used

to drive a comb filter circuit.

■ Automatic digital cut-off current loop with warm-

up detection circuit.

■ White point (drive) and cut-off point

adjustments.

■ Manual cut-off capability.

■ Beam current limiter control stage.

■ High-performance sync pulse separator.

■ Horizontal synchronization with two phase-

locked loops.

■ Integrated VCO, auto-calibration using the

chroma crystal reference frequency.

■ Automatic time constant selection for the first

PLL, three selectable time constants.

■ Video identification circuit (independent from

PLL1).

■ Noise detector circuit.

■ Vertical countdown circuit.

■ Automatic 50/60 Hz selection circuit.

■ Blanking and inserted cut-off pulses position

adapted to standard (50 or 60 Hz).

■ Long blanking mode capability in 60 Hz (same

blanking as with 50 Hz standard).

■ De-interlace capability.

■ Horizontal starting circuit with soft-start

capability.

■ Horizontal and vertical position adjustments,

vertical amplitude control voltage (combined

with chroma subcarrier output).

■ Oversize Blanking capability on OSD Fast

Blanking input.

19/86

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