STV2216 datasheet(4/26 Pages) STMICROELECTRONICS

4 / 26 page

FUNCTIONAL DESCRIPTION (continued)

2 - FILTERS

- Integrated trap filter :

f−3dB

−

f−3dB

Q = 2.5 at sharp. min

Center frequency : 4.43MHz,

3.58MHz for PAL, NTSC

- Integrated chroma bandpass : Q = 3.5

Center frequency : 4.43MHz, 3.58MHz

- Integrated delay line : Bandwidth = 8MHz

- Integrated low pass filter for deflection part.

- All filters are tuned with a reference phase locked

loop. The PLL consists of a lowpass filter, a phase

comparator, a loop filter (with an external capaci-

tor). The reference signal is the continuous carrier

wave from the VCO (4.43MHz or 3.58MHz). The

PLL adjusts the centerfrequencyof the lowpass so

that it is equal to the reference signal. The tuning

voltage of the PLL is used to adjust all other filters.

3 - VIDEO CIRCUIT

- 1 analogRGB input with fixed gain. It may be used

for OSD, Text, ...

- 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 2V (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. This will increase frame blan-

king time in 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 attenuation reaches -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 (0

o, 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.

Can be disabled through the bus

- Bus controlled blue screen feature.

- Black stretcher. Can be disabled through the bus.

STV2216

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