STV2102
PAL LUMA-CHROMA & DEFLECTION PROCESSOR
May 1992
PRELIMINARY DATA
1
2
3
4
5
6
7
8
9
10
11
12
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
13
14
15
16
17
18
19
20
21
24
23
22
COG
HVc c
BOUT
COB
YIN
SLPF
SXTL
CVBS
LFB
VOUT
HOUT
CTR
DLI
PS
DELAY CHROMA INPUT
CONTRAST CONTROL
HORIZONTAL OUTPUT
VERTICAL OUTPUT
LINE FLYBACK INPUT
COMPOSITE VIDEO SIGNAL
SCANNING LOOP FILTER
SCANNING XTAL
GREEN CUT-OFF CAPACITOR
BLUE OUTPUT
HORIZONTAL Vcc
BLUE CUT-OFF CAPACITOR
LUMINANCE SIGNAL INPUT
Vcc
COR
BRIG
FBL
CLPF
CXTL
CKP
SAT
DLO
GND
GROUND
CHROMA OUTPUT
SATURATION CONTROL
PAL KILLER CAPACITOR
CHROMA XTAL
SUPPLY VOLTAGE INPUT
RED CUT-OFF CAPACITOR
BRIGHTNESS CONTROL
FAST BLANKING INPUT
CHROMA LOOP FILTER
ICAT
CATHODE CURRENT
RIN
RED INPUT
BIN
GIN
GREEN INPUT
BLUE INPUT
ACC
ACC CONTROL CAPACITOR
GROUND
GND
PALIN
PAL CHROMA INPUT
Vcc
SUPPLY VOLTAGE
BLK
BLANKING INPUT
GOUT
GREEN OUTPUT
ROUT
RED OUTPUT
NC
NOT CONNECTED
CHROMA STANDARD
NC
NOT CONNECTED
NC
NOT CONNECTED
NC
NOT CONNECTED
NC
NOT CONNECTED
NC
NOT CONNECTED
NC
NOT CONNECTED
2102-01.EPS
PIN CONNECTIONS
SHRINK 42
(Plastic Package)
ORDER CODE : STV2102
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without no tice.
n
RGB AND FAST BLANKING INPUTS
n
AUTOMATIC CUT-OFF CONTROL
n
DC-CONTROLLED
BRIGHTNESS,
CON-
TRAST AND SATURATION
n
CERAMIC 500kHz VCO FOR LINE DEFLEC-
TION
n
PHASE-LOCKED REFERENCE OSCILLATOR
USING A STANDARD 4.43MHz
n
OSD CAPABILITY ON OUTPUTS
n
VIDEO IDENTIFICATION GENERATOR
DESCRIPTION
The STV2102 is a PAL chroma decoder, video and
H/V deflection processor for CTV.
Used with the TDA8222, this IC permits a complete
low cost solution with external output stages.
It is pin compatible with STV2110 PAL/SECAM
processor.
1/12
SAT
Black
Insertion
Clamp
Black
Reference
Saturation
Matrix
RGB
Switch
Contrast
+
Clamp
35
16
SA
T
FBL
R
I
N
G
IN
B
I
N
C
T
R
Tube
Temp
Meas.
Brightness
36
BR
I
G
Blanking
RG
B
Cut-off
Blk.
RGB
Leak.
Current
Meas.
5
HV
c
c
Vc
c
V
c
c
XVCO
90deg
Phase
Detector
Killer
Burst
Detector
DL
Matrix
ACC
19
32
34
33
CXTL
CLPF
ACC
CKP
PALIN
YIN
9
Flip-Flop
PAL
22
25
23
20
24
Burst
Gate
Generator
13
Sync.
Sep.
12
Mute
10
Phase
Comp.
2
P
hase
Shift
Divider
Phase
Comp.
1
VCO
Line
Output
F
rame
Output
Decoder
11
15
14
HOUT
VOUT
SXTL
SLPF
CVBS
PS
LFB
3
38
8
ROUT
G
OUT
BOUT
COR
COG
COB
ICAT
Frame
Sync.
Separator
GND
DLO
DLI
12
7
41
37
39
40
4
6
7
42
2
BL
K
Blank.
Comp.
Line
Counter
PAL
Demod.
30
18
17
31
21
26
29
28
GND
Y
Input
Contrast
NC
NC
NC
NC
NC
NC
NC
2102-02.EPS
BLOCK DIAGRAM
STV2102
2/12
FUNCTIONAL DESCRIPTION
DEFLECTION
Synchronization Separator
The synchronization separator is based on the
bottom of synchronization pulses alignment to an
internal reference voltage. An external capacitor
permits to align synchro. pulses, two external resis-
tors determines the detection threshold of synchro
pulses. The frame synchronization pulses are
locked to a 32
s reference signal to perfect inter-
lacing.
Horizontal Scanning
The horizontal scanning frequency is obtained from
a 500kHz VCO. The circuit uses two phase-locked
loops (PLL). The first one controls the frequency;
the second one, fully integrated, controls the rela-
tive phase of the synchronization and the line fly-
back signals.
The first PLL has two times constants : a long time
constant during the picture to have a good noise
immunity, a short time constant at the beginning of
the frame to recapture faster the phase in case of
VCR video signal. More over, the PLL is in short
time constant three lines before frame pulses oc-
cured, it permits to ensure good interlacing when
the video signal comes from a VCR tape with high
phase error.
The horizontal output signal is 28
s width. On
starting up, horizontal pulses are enabled at
V
CC
= 6.8V. On shutting down, horizontal pulses
are inhibited for V
CC
= 6.2V.
The vertical output signal is 10.5 lines width. It
permits to drive a sawtooth generator such as
TDA1771.
A video recognition function permits to sent the
information of no video identification to SAT pin : it
forces a low level when no video detection occurs.
CHROMA
ACC Amplifier, DL Matrix and Demodulator
The correct chroma subcarrier input, issued from
bandpass, is internally selected with the standard.
The ACC amplifier envolves three stages : the first
one select the correct input, the second one the
-6dB in picture (PAL mode), the third one is con-
troled by the ACC voltage.
The dynamic range is over than 30dB.
The chrominance output signal is fed to the delay
line.
The adding and substracting direct and delayed
signals are performed by the DL matrix function.
Two
synchronous
demodulators
multiplies
the (B-Y) signal with the 0 degree phase 4.43MHz
reference signal and the (R-Y) signal with the alter-
nate
90 deg. 4.43MHz phase reference signal.
4.43MHz Phase Locked Loop
The oscillating frequency of the 4.43MHz crystal
oscillator is controlled by the output voltage of the
loop filter. The phase detector will lock the 90 de-
gree reference signal to the direct burst signal.
A 90 degree phase shifter permits to recover the
0 degree reference signal. A flip-flop driven by line
pulses permits to generate the alternate
90 de-
gree signal.
ACC Control and Color Killer
The direct burst signal is demodulatedwith the
90
degree reference signal. The demodulation result
is used by ACC control and killer function.
If the demodulation result is always positive, the
killer capacitor is charged and the standard is iden-
tified (color ON). When demodulation result is al-
ways negative, the killer capacitor voltage reaches
the flip-flop inhibition level, so the alternace se-
quence is reversed and the capacitor is charged
again.
In case of no video signal, the killer capacitor
voltage is maintained about V
CC
/2, below the color
off threshold.
VIDEO
The luminance input is controlled by the contrast
control stage which range is 20dB.
The luminance and color difference signals are
added in the video matrix circuit to obtain the color
signals.
The color signals are sent to an RGB switch which
will drive to the outputs either internal RGB signals
or external RGB signals.
Automatic Cut-off Control
The black levels of the RGB outputs are controlled
with the cut-off loops during three line periods after
the frame retrace. The cut-off measurements are
sequentially achieved during these three lines. The
leakage current measurement is achieved during
the frame retrace and memorized on an internal
capacitor, thus the circuit is able to extract the
cut-off current from the total current measurement.
Warm-up Detector
At the start-up, the cut-off loops are switch off, a
white level is inserted on the luminance signal until
a cathode current is detected. Then the cut-off
loops are released.
STV2102
3/12
RGB Inputs
To avoid the black level of the inserted signal
differing from the black level of the normal video
signal, the external RGB are clamped to the black
level of the luminance signal. Therefore, an AC
coupling is required for the RGB inputs.
The RGB inputs are controlled by a 12dB range
contrast control stage.
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
cc
Supply Voltage
12
V
T
stg
Storage Temperature
-55, +150
o
C
T
oper
Operating Temperature
0, +70
o
C
2102-01.TBL
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th (j-a)
Junction-ambient Thermal Resistance
Max.
70
o
C/W
2102-02.TBL
DC AND AC ELECTRICAL CHARACTERISTICS (V
CC
= 9V, T
amb
= 25
o
C unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
HV
cc
Scanning Supply Voltage (Pin 5)
8.1
9
9.9
V
V
cc
Video & Chroma Supply Voltage (Pins 41-42)
8.1
9
9.9
V
I
cch
Scanning Supply Current (pin 5)
No load
20
30
mA
I
ccv&c
Video & Chroma Supply Current (Pins 41-42)
No load
45
55
mA
P
D
Total Power Dissipation
No load
580
850
mW
LUMINANCE INPUT (Pin 9)
V
BW9
Input Level before Clipping (black to white)
350
mV
PP
VDC9
DC Operating Voltage
No input signal
2.5
V
I
g
Input Current
During burst period
Out of burst period
100
5
A
A
G
9
Luma Gain
5.5
CONTRAST CONTROL (Pin 16)
V
16
Contrast Control Voltage
2 to 4
V
V
16 (Max.)
Maximum Allowed Control Voltage
5
V
G
16
Contrast Control Range
20
dB
I
16
Input Current
10
A
BRIGHTNESS CONTROL (Pin 36)
V
36
Brightness Control Voltage
1.5 to 4.5
V
V
36 (Max.)
Maximum Allowed Control Voltage
5
V
I
36
Input Current
10
A
SATURATION CONTROL INPUT (Pin 27)
I
29
Input Current
10
A
V
29
Saturation Control Voltage
2 to 4
V
V
29 (Max.)
Maximum Allowed Control Voltage
5
V
G
29
Saturation Control Range
-50
dB
RGB CLAMP CAPACITORS (Pins 4-7-39)
I
4-7-39
Control Current
150
A
I
i4-7-39
Leakage Current
1
A
RGB OUTPUTS (Pins 4-6-7)
V
BW 4-6-7
Output Signal Amplitude (black to white)
0.35V B to W @ Pin 9
Contrast @ max
Sat. & Brig. @ 3V
2
V
2102-03.TBL
STV2102
4/12
DC AND AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 9V, T
amb
= 25
o
C unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ. Max.
Unit
RGB OUTPUTS (Pins 4-6-7) (continued)
-I
4-6-7
Individual Output Sinking Current
2
mA
VM
4-6-7
Maximum Peak White Level
7.8
V
V
blank 4-6-7
Blanking Level
0.7
V
Relative Variation in Black Level with Various
CONT. SAT. BRIG between the 3 channels
20
mV
V
temp
Black Level Thermal Drift
0.5
mV/
o
C
BW
4-6-7
Bandwith
- 3dB
5
MHz
Tracking between Luminance and Chrominance
Signals over 10dB Contrast Control
2
dB
RGB INPUTS (Pins 37-39-40)
V
BW37-39-40
Maximum Input Level (B to W)
2
V
V
clamp
37-39-40
Clamp Level
Contrast max
1.5
V
BW
37-39-40
Bandwidth
-3dB
8
MHz
G
CTR
RGB Contrast Control Range
12
dB
G
37-39-40
RGB Gain
4
FAST BLANKING INPUT (Pin 35)
V
TH1-35
First Threshold (switching)
0.7
V
V
TH2-35
Second Threshold (switching)
2.1
V
I
35
Input Current
0V @ Pin 35
50
A
T
switch
Switching Delay
50
ns
T
blank
Blanking Delay
50
ns
CATHODE CURRENT INPUT (Pin 42)
Leakage Current Reference Voltage
1.75
V
CO Reference refered to Leakage Current
Reference
250
mV
Low Voltage Output Current
200
A
AUTOMATIC CUT-OFF (Pin 3-8-38)
Capacitor Cut-off Positive Negative Clamping
100
A
Start-beam Current Detection Reference
Voltage
2
V
V
4-6-7
Cut-off Output Range
3
V
CHROMINANCE INPUT (Pin 18)
V
18
Input Level Before Clipping
900
mV
PP
V
burst-18
Minimum Burst Signal Amplitude within the
ACC Control Range
30
mV
PP
G
ACC
ACC Control Range
Change of burst over whole
ACC Control Range < 1dB
30
dB
R
18
Input Impedance
8
k
V
DC-18
DC Operating Voltage
No input signal
3.5
V
ACC CAPACITOR (Pin 30)
I
30
Charging Current
During burst gate period
250
A
I
i30
Leakage Current
Out of burst gate period
1
A
PLL LOOP FILTER (Pin 34)
I
34
Control Current
400
A
I
i34
Leakage Current
5
A
CHROMAXTAL (Pin 33)
CR
33
Catching Range
700
Hz
2102-04.TBL
STV2102
5/12
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