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STV2112B
BUS-CONTROLLED PAL/SECAM TV PROCESSOR
STV2112BBUS-CONTROLLED PAL/SECAM TV PROCESSOR
August 1998 22
GND1
Y/CVBS
BEXT
FBOSD
ROSD
GOSD
BOSD
SWI
VOL
FTUN2
FTUN1
SCL
SDA
ACC
CLPF
CXTL1
SELECT
GND2 VCC2
BYO
RYO
LFB/SC
HOUT
VOUT
VAMP
SLPF
SXTL
BCL
ICAT
CHR/SVHS
VCC1
CHROMA/SCANNING/BUS SUPPLY
BYI
RYI
B-Y OUTPUT
R-Y OUTPUT
R-Y INPUT
B-Y INPUT
LINEFLYBACKINPUT/SANDCASTLE OUTPUT
HORIZONTALOUTPUT
VERTICALOUTPUT
AMPLITUDECONTROL VOLTAGE
SCANNING LOOP FILTER
503kHz CERAMIC
BEAMCURRENT LIMITER
CATHODE CURRENT MEASUREMENT
RED OUTPUT
GREEN OUTPUT
BLUE OUTPUT
RED CUT-OFF CAPACITOR
BLUE CUT-OFF CAPACITOR
GREEN CUT-OFF CAPACITOR
CHROMINANCE INPUT/SVHS SELECTION
VIDEOSUPPLYBUS/VIDEO GROUND
CVBSOR LUMINANCE INPUT
EXTERNAL BLUE INPUT
OSDRGB INSERTION
OSD BLUEINPUT STANDARDANDSWITCHSELECTION
VOLUME ANDMUTECONTROLVOLTAGE
FILTER TUNING
DATAWIREI2CBUS
ACC CONTROL CAPACITOR
CHROMALOOP FILTER
XTAL2 SELECTION
CHROMA/SCANNING GROUND
4.43MHz XTAL
CLOCK WIREI2CBUS
CLOCHE FILTERTUNING
OSD GREEN INPUT
OSDRED INPUT
GEXT
REXT
FBEXT
EXTERNAL GREEN INPUT
EXTERNALRED INPUT
EXTERNALRGB INSERTION
PIN CONNECTIONS
SHRINK42
(Plastic Package)
ORDER CODE: STV2112BI2C BUS CONTROL OF ALLFUNCTIONS. INTEGRATEDFILTERS
(TRAP, BANDPASS, CLOCHE). INTEGRATEDLUMINANCE DELAYLINE. PAL/SECAM CHROMA DEMODULATORS. AUTOMATIC CUT-OFF CURRENT LOOP. TWO RGB INPUTS. SVHS SWITCH. TWO PLLs HORIZONTAL DEFLECTION. VERTICAL COUNT DOWN. VERY FEW EXTERNAL COMPONENTS
DESCRIPTIONThe STV2112Bisa fully bus controlledIC for TV
luma, chroma and deflection processing.
Used with STV8224 (PIF/SIF/switches), TDA1771
orTDA8174 (framebooster),STV2180(delayline),
itallowstodesignaPAL/SECAM(BGDKIL) setwith
very few external componentsandno adjustment.
1/24
CHR
Y/CVBS
CHR
ACC
SELECT
CXTAL1GBICATCRCGCB BCL VOUT HOUT
SXTAL
SLPF
LFB/SC
GND2
SWI
VOL
CLPF
R-Y
B-Y
FILTER
TUNING
CC1
SDA
SCL
CLOCHE
TUNING
HARP
CC2
GND1
FILTER
TUNING
TRAP
BANDPASS
CLOCHE
SVHS
SWITCH 23
DELAY
LINE
SHARPNESS
MATRIX
SATURATIONBRIGHTNESS
CONTRAST
RGB
SWITCHES
Contrast
BLANKING
AUTO
CUT-OFF
BLACK
WHITE
CONTROL
R-Y
B-Y
EXTERNAL
OSD282730262425 31 35
VAMP
FRAME
SCANNING
LINE
SCANNING
SYNC
SEPARATOR
STANDARD
IDENTIFICATION
ACC
PAL
KILLER
SECAM
KILLER
SECAM
DEMODULATORS
PAL
DEMODULATORS
DELAY
LINE
INTERFACE 3
BUS
DECODER 6
BRIG
DRIV
VIDEO
IDENTIFICATION
CUT-O
STV2112B
BLOCK DIAGRAM
STV2112B
2/24
FUNCTIONAL DESCRIPTION- DEFLECTION CIRCUIT
Note: [X,Y]: line number referredto the internal
line counternumbering Fully integrated synch. separator, witha low pass
filter,a black levelalignmentof the Y/CVBS input,a
slicing levelat2/3,1/3of the sync. pulseamplitude. Frame sync. pulse locked on2fH frequencyto
perfect interlace. 500kHzVCO withan externalceramicresonator. Two phase locked loops the first PLL locks the VCOon the video signal
frequency, thesecondPLLcompensatestheline transistor
storage time. Three time constantsfor the first PLL. thelongtimeconstantisusedfor normaloperation the short time constantis automatically used
during the frameretrace andin search modeof
VCR when the frame pulseis outside[258,264]
and [309,314]. verylongtime constantwhennovideo recognition
Time constantsin normaloperation
(automaticselectionof time constants):
50Hz input signal: short time constant: [306, 21] long time constant: the restof the field inhibitionof the first PLL:
the first locked loopis opened from line 309to
line 4.5(or 314)in 50Hz mode. thetime constantsvalues are chosenby means external components. possibilityto force the short time constant
through the bus. possibilityto force the very long time constant
through the bus. Video identification: coincidence detector be-
tween the line synchro top anda line frequency
windowfromthe firstPLL.The videoidentification
statusis availablein the output registerof theI2C
bus decoder. Generationof burst gate pulses and line fre-
quency signals from the first PLLto drive the
chroma and video circuits. The burst gate pulse also sentto the sandcastle generator. Frame synchro window:
[248, 352] catching Field frequency selection windows:
[288, 352] 50Hz mode selection window frame blanking pulse:
from line0to21in 50Hz mode Verticaloutput pulseis 10.5 lines long. Horizontal output pulse: 28μs line pulseon an
open collector output; Startup circuit: the horizontal outputisata high
level when VCC increases from0to 6.8V. On
shutting down, horizontal pulses are disabled
when VCCis below 6.2V. Soft-start circuit: the duty cycleof the horizontal
outputis78% (Thigh/(Thigh+ TLow))when VCC1 lowerthan (0.75x VCC2), during the rising time.
During the falling time,a 78% duty cycle HOUT
pulseis provided when VCC1is lower than
(0.60x VCC2). Possibilityto disable the horizontal output pulse
through the bus (forcea high levelon HOUT). Horizontal position adjustmentcontrolledby bus. Bus controlledoutputvoltageto adjustthevertical
amplitude;thisvoltagepermitsto adjustthe slope theverticalsawtoothgeneratedby the external
frame booster. Bus controlled vertical position; the high levelof
the vertical pulse permitsto adjust the vertical
position. Bus controlled 4/3-16/9 selection: the low level theverticalpulseis 0.1Vwhen 16/9is selected, when 4/3is selected. Combined flyback input and sandcastle output
(Pin 37). Two thresholdson LFB/SCO Pin: The
lowest threshold(0.7V) permitsto extract the line
blanking pulse; the highest threshold (2V) per-
mitsto extract the line pulse forPLL2. Thesand-
castle signalat Pin 37is usedto control the
external basebandchroma delay line.
- FILTERS Integratedtrap filter:= 1
f−3dB− f−3dB= 1.7at sharp. min= 3.0at sharp. max
Center frequency: 4.43MHzfor PAL 4.25MHz,for SECAM (f-3dB= 3MHz; -20dB
rejection between 4.1MHz and 4.4MHz) Integratedchroma bandpass:= 3.5, Centerfrequency= 4.43MHz Integratedcloche filterfor SECAM:= 16, Center frequency= 4.286MHz Integrateddelay line: Bandwidth= 8MHz Integratedlow pass filterfor deflectionpart. Allfiltersaretunedwithareferencephaselockedloop.
ThePLLconsistsofa lowpassfilter,a phasecompa-
rator,a loopfilter(with anexternalcapacitor).Theref-
erencesignalis thecontinuouscarrierwavefrom the
VCO (4.43MHz). The PLL adjusts the center fre-
quencyof the lowpass so thatitis equalto the
referencesignal.ThetuningvoltageofthePLLisused adjustall otherfilters. The clochefilteris finetuned
witha secondPLLoperatingduring frame retrace.
STV2112B3/24
- VIDEO CIRCUIT2 RGB inputs: RGB (OSD) input has priorityagainst the RGBext. Maximum contraston RGB
(OSD). -12dB range contrast controlon RGBext.
Possibility to disable the RGBext insertion
throughthe bus. Oversize blanking capabilityon FB(OSD)(Pin15)
input. The RGB ouputs willbe blanked when the
voltageon Pin15 will exceed the second thresh-
oldat 1.9V (blanking threshold): the whole field blankedbutnot theinserted cut-offpulses. The
OSD insertion thresholdis 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, memorizationonan internal capacitor. Warmup detector. Beam current limiter DC voltage input.
The beam current limiter control voltage will act contrast first, then the brightness will be de-
creasedwhen contrastattenuationreaches-5dB. Bus controlof the red, green and blue channel
gain (White point adjustment) Buscontrolof the red and greenDC levels(black
point adjustment) PAL and SECAM matrix). Switch-offof the trapfilterin SVHS mode. Buscontrolledcontrast onluminance(20dBrange) Bus controlled saturation (50dB range) Bus controlled brightness: 40% rangeat maxi-
mum contrast. Bus controlled sharpness (peaking); sharpness
activein PAL standard only. Noise coring functionon sharpness.
- CHROMA CIRCUIT
4.1- PAL/SECAM 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 force the standard through the bus.
4.2- PAL Decoder ACC doneby peak detectoron synchronous de-
modulationof the burst Fully integrated killer functions. VCO using crystal 4.43MHz
XTAL SPECIFICATION:
Frequency:
4.433619MHz(PAL/SECAM)
Vibrationmode: Fondamental,seriesresonance
(no serial capacitor)
Motional capacity: 13fF ±3fF
Resonance resistance:< 70Ω
Shunt capacitance:< 7pF
Spurious response: No resonanceat 3*fo ±3kHzo and ±90o demodulation anglesfor PAL
4.3- SECAM Decoder ACC Fully integratedkiller Two integrated discriminators with two PLL Integrateddeemphasis
4.4- StandardIdentification Sequential identification.2 identification sequences:
PALmode, SECAM mode PALpriority the SECAM modeis locked after two identified
SECAM sequences the SECAM mode canbe selectedin 50Hz only Blankingof the (R-Y) and B-Y) outputs during
color search mode.
- OTHER FUNCTIONS:IF CONTROLS
5.1- VolumeControl and MuteThe volume controlvoltage rangeon Pin10is from
0.5Vto 5V. low voltageon Pin10 (below 0.2V) will mute the demodulatorof theIF circuit STV8224. will put thevolumeat theminimumlevel and thus
there willbeno soundeitherin TV modeor SCART
mode.
The volume control voltage and the mute level are
controlledby the bus.
5.2- IFStandard and TV/SCART Mode SelectionThe selectionofIF standard (positiveor negative
visionmodulation)and theTV/SCARTmodeis con-
trolled bythe bus. Theselectionis convertedin four
voltageson Pin 21.
The lowest voltage selects the TV mode and the
NEGATIVE vision modulation.
The highest voltage (open collector output with
internal pull-up resistorto VCC) selects the SCART
mode and the NEGATIVE vision modulation.
The two other intermediate voltages select either mode and POSITIVE vision modulation or
SCART mode and POSITIVE vision modulation.
FUNCTIONAL DESCRIPTION (continued)
STV2112B4/24
2
C BUS SPECIFICATIONGeneral CommentsSlave Address: 8A (HEX) (1000101X)
WRITE MODE DATAFORMAT
Slave Address Register Address Data1000 1010
(8A)
XXXS SSSS
(from00to 11HEX)
XXSS SSSS significant bits Max.)
The not used bitsin data byte mustbe putto ”0”.
READ MODE DATAFORMAT
Slave Address Data1000 1011
(8B)
SSSS SSSS significant bits)
MSBontheleft, LSBonthe Right.
MSB LSB X X XXX X:not significantbit-S: significantbit
Input Signals (Write Mode)
VIDEO
Address
Dec (HEX) Description Data
(Bits) Comments (00) Contrast 5 XXX0 0000= -20dB
XXX1 1111= 0dB (00) External Fast Blanking Enable 1 XXSX XXXX= RGBext insertion enable= RGBext insertion disable (01) Saturation 6 XX00 0000= -44dB
XX11 1111= +6dB (02) Brightness 5 XXX0 0000= -20%
XXX1 1111= +20% (02) RGB Outputs Blanking 1 XXSX XXXX= Normal mode= Blanking active (03) Red Drive Adjust(white pointred adjust) 6 XX00 0000= -6dB
XX11 1111= 0dB (04) Red Cut-off Adjust 6 XX00 0000= +150mV
XX11 1111= -150mV (05) Green Drive Adjust (white point green adjust) 6 XX00 0000= -6dB
XX11 1111= 0dB (06) Green Cut-off Adjust 6 XX00 0000= +150mV
XX11 1111= -150mV (07) Blue Drive Adjust (white point blue adjust) 6 XX00 0000= -6dB
XX11 1111= 0dB (08) Sharpness 3 XXXX X000= PeakingMin.
XXXX X111= PeakingMax.
STV2112B5/24
2
C BUS SPECIFICATION (continued)
Input Signals (Write Mode) (continued)
CHROMA
Address
Dec (HEX) Description Data
(Bits) Comments (09) Not used (0A) Standard Selection 4 XXXX SSSS
0000= PAL/XTAL1 (4.43MHz)
0100= SECAM/XTAL1
011X= Auto/90o
0001= Not allowed
0010= Not allowed
0011= Not allowed
0101= Not allowed
1000= Not allowed
1001= Not allowed
1010= Not allowed
1011= Not allowed
111X= Not allowed
1100= Not allowed
1101= Not allowed (0A) SVHS Selection 1 XXXS XXXX=No SVHS (CVBS mode)= SVHS mode
DEFLECTION
Address
Dec (HEX) Description Data
(Bits) Comments (0B) Horizontal Shift 6 XX00 0000= -2.5μs
XX11 1111= +2.5μs (0C) VerticalAmplitude 6 XX00 0000= 1.2V
XX11 1111= 6.2V (0D) VerticalPosition 3 XXXX X000= 3.8V
XXXX X111= 6.3V (0D) 50/60Hz Selection 2 XXXS SXXX= Automode= Not allowed= 50Hz= Not allowed (0D) Horizontal Output (HOUT) Safety 1 XXSX XXXX= Normalmode= HOUT disabled (high level) (0E) PLL1 Time Constant 2 XXXX XXSS= Normal mode (Auto)= Short time constant= Very long time constant= PLL1 inhibition (open loop) (0E) Interlace 1 XXXX XSXX= Interlace= DE-Interlace (0E) 4/3 16/9 Selection 1 XXXX SXXX=4/3 (VOUT-Low= 2V)= 16/9 (VOUT-Low= 0.1V)
STV2112B6/24
2
C BUS SPECIFICATION (continued)
Input Signals (Write Mode) (continued)
OTHERS
Address
Dec (HEX) Description Data
(Bits) Comments (0F) Volume 6 XX00 0000= 0.5V
XX11 1111=5V (10) Mute 1 XXXX XXXS= Mutenot active= Mute active (10) IF Standard/ AV Switch 2 XXXX XSSX= INT/FM (negative)= INT/AM (positive)= EXT/AM (positive)= EXT/FM (negative) (10) Not Used 1 XXXX SXXX=0 default value (10) Cut-off Pulse Position 1 XXXS XXXX= lines 23/24/25 in50Hz,1= Not allowed (11) Onlyfor Test 6 XXSS SSSS 0000= Test modenot active
Output Signals (Read Mode)
READ REGISTER
Description Data (Bits) CommentsField Frequency 1 XXXX XXXS= 50Hz= not50Hz
Video Identification 1 XXXX XXSX=No Identification= VideoIdentification
SVHS Status 1 XXXX XSXX=No SVHS= SVHS
Standard Status 3 XXSS SXXX
111= PAL/XTAL1 (4.43MHz)
110=nottobe used
101= SECAM/XTAL1
011=nottobe used
010=nottobe used
X00= Coloroff
Circuit Identification 2 SSXX XXXX= STV2118A/2116/2112= STV2116A
= STV2112B= STV2216
STV2112B7/24
2
C BUS SPECIFICATION (continued)
Bus Register Initial ConditionsNot used bits are presetto ”0”.
Address
Dec (HEX)
Data Initial
Value Comments (00) XX01 0000 Mid. contrast; RGBext insertion enable (01) XX10 0000 Mid. saturation (02) XX01 0000 Mid. brightness; Blanking: normal mode (03) XX10 0000 Mid. RED driveadjust (04) XX10 0000 Mid. RED cut-off adjust (05) XX10 0000 Mid. GREEN drive adjust (06) XX10 0000 Mid. GREEN cut-off adjust (07) XX10 0000 Mid. BLUE drive adjust (08) XX00 0100 Mid. sharpness (09) XX10 0000 Not used (0A) XX00 0110 Auto search color standard;no SVHS (0B) XX10 0000 Mid. horizontal shift (0C) XX10 0000 Mid. vertical amplitude (0D) XX00 0100 Mid. vertical position; Auto search field frequency; HOUT: normalmode (0E) XX00 0000 PLL1 time constant: normal mode; Interlace; 4/3 selection (0F) XX10 0000 Mid. volume (10) XX00 0000 Mutenot active; INT/FMIF mode; Not used;
Cut-off pulseson lines 23/24/25in 50Hz (11) XX00 0000 Test modenot active
STV2112B8/24
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value UnitVCC Supply Voltage (Pins 22-42) (VCC1(22)≤ VCC2(42))12 V
Toper Operating Temperature 0, +70 oC
Tstg Storage Temperature -55, +150 oC
THERMAL DATA
Symbol Parameter Value Unit
Rth(j-a) Junction-ambient Thermal Resistance (PD= 1.3W) Typ. 40 o C/W
ELECTRICAL CHARACTERISTICS (VCC =9V,Tamb =25oC, unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. UnitSUPPLY
VCC1 Video Supply Voltage (VCC1≤ VCC2) 8.1 9 9.9 V
VCC2 Chroma& Scanning& Bus Supply Voltage 8.1 9 9.9 V
ICC1 VCC1 Current Consumption 55 75 95 mA
ICC2 VCC2 Current Consumption PAL mode 50 70 90 mA
Ptot Power Total Dissipation 1305 1700 mW
LUMINANCE /CVBS INPUT (Pin 20)
DC20 DC Operating Voltage No input signal 3.55 3.7 3.95 V
V20PP CVBSorY Input Voltage 1 1.41 VPP Luma Gain Contrast Max., Drive Max. 4.1 -
CTRY Luma Contrast Range 18 20 22 dB
-I20 Negative Clamping Current During sync. pulse -20 -25 -35 μA
I20 Clamping Current 5 10 μA
COMBINED CHROMINANCE AND SVHS SELECTION INPUT (Pin 23)
V23 Chrominance Input Voltage Burst Amplitude,
100/75 colourbar
0.3 VPP
VCLIP23 Input Amplitude before Clipping 1.0 VPP
VDC23 DC Voltage SVHS mode 1.6 V
VTH23 SVHS Threshold Voltage 0.5 0.7 V
Ilow23 Output Current 0Vat Pin23 120 170 μA
Vmin23 Minimum Burst Signal Amplitude within
the ACC Control Range mVPP
GACC ACC Control Range Changeof Burst over whole
ACC control range< 2dB dB
Killer Colour Killeron Threshold
Colour killeroff hysteresis
Burst amplitudeon Pin20or
Pin 23, S/N> 40dB
mVPP
RGB INPUTS (Pins 12-13-14-16-17-18)
VCLAMP Clamp Level Contrast Max., Drive Nom. 1.5 1.8 2.1 V
VRGB RGB Input Voltage 0.7 1 VPP
GRGB RGB Gain Contrast Max., Drive Max. 4.0 -
CTR RGB RGB Contrast Range On external RGB (16-17-18) 11.5 dB
ΔBlack Differenceof Black Levelof Internal and
External signalsat the Outputs
200 mV
IRGB Clamping Current 60 100 140 μA
STV2112B
9/24
ELECTRICAL CHARACTERISTICS (VCC =9V,Tamb =25oC, unless otherwise specified) (continued)
Symbol Parameter Test Conditions Min. Typ. Max. UnitOSD FAST BLANKING INPUT (Pin 15)
VTHFB1-15 Insertion Threshold Voltage 0.5 0.7 0.85 V
VTHFB2-15 Blanking Threshold Voltage 1.6 2.0 2.4 V
Tswi1-15 Insertion Switching Delay 30 ns
Tswi2-15 Blanking Switching Delay 50 ns
IFB-15 Input Current 0Vat Pin15 50 μA
EXTERNAL FAST BLANKING INPUT (Pin19)
VTHFB-19 Threshold Voltage 0.5 0.7 0.85 V
IFB-19 Input Current 0Vat Pin19 50 μA
Tswi-19 Switching Delay 30 ns
CATHODE CURRENT INPUT (Pin 30)
VLEAK Leakage Current Reference Voltage 1.80 2.0 V
VCoff Cut-off Current Reference Voltage
referedto Leakage Current Reference
250 mV
VSB Start Beam Current Detection
Reference Voltage
2.1 2.3 V
ILow-30 Source current 150 250 μA
AUTOMATIC CUT-OFF CAPACITORS (Pins 24-25-26)
I24-25-26 Control Current 70 100 130 μA
BEAM CURRENT LIMITER VOLTAGE (Pin 31)
VTH1-31 Contrast Attenuation Starting 6.0 V
VTH2-31 Brightness Attenuation Starting 5.5 V
VTH3-31 Contrast Attenuation Ending 5.0 V
CTR-BCL Contrast Attenuation atV31=VTH3-31 14.0 dB
VTH4-31 Brightness Attenuation Ending 4.5 V
BRIG-BCL Brightness Attenuationat V31=VTH4-31 100 %
CLP31 High Clamping Voltage 6.5 V
RGB OUTPUTS (Pins 27-28-29)
VBW Output Signal Amplitude(BtoW) 0.7V B/Wat Pin20, Drive Max.,
Contrast Max., Brightness Typ.,
Saturation Typ.
2.85 V
IS27-28-29 Output Sinking Current 1.5 2 mA
VM27-28-29 Maximum Peak White Level 7.8 V
VBlack27-28-29 Blanking Level No load 0.3 0.45 0.6 V
RCO Cut-off Output Range 2 2.6 V
DCCO Cut-off Adjustment Range On Red and Green ouputs
Pins29 and28, Drive Max.
300 mV
DRIV Drive Adjustment Range 6.5 dB BRIG Brightness Range Relativeto B/W amplitudeon
R,G,B outputsat Contrast Max. 40 50 %
ΔVCTR Variationof Black Level with Contrast 100 mV
ΔVSAT Variationof Black Level with Saturation 50 mV
ΔVREL Relative Variationin Black Level
between the three Channels during Variationof Contrast(20dB) during Variationof Brightness
(total range) during Variationof Vcc (+/-10%)
Drive Max.
ΔVTemp Black Level Thermal Drift 1 mV/oC
12B
STV2112B10/24
ELECTRICAL CHARACTERISTICS (VCC =9V, Tamb =25oC, unless otherwise specified) (continued)
Symbol Parameter Test Conditions Min. Typ. Max. UnitRGB OUTPUTS (Pins27-28-29) (continued)
Track Tracking between Luminance and
Chrominance Signals
From Max. contrast (0dB) -10dB contrast
2dB
Bwidth Bandwithof Output Signalsat -3dB CVBS Input (no SVHS) PAL CVBS Input(no SVHS) SECAMY Input SVHS Mode RGB Inputs
fOSC= 4.43MHz, Sharp Typ.
fOSC= 4.43MHz,no sharp trap Filter, Sharp Typ.
MHz
MHz
MHz
MHz
S/N Signalto Noise Ratioof Output (VPP/VRMS)
4.43MHz PAL Signal Y/CVBS Input signalon R-Y, B-Y inputs
Contrast Max., Drive Max.,
Saturation Typ., Sharp Typ.,
Bandwidth 5MHz dB
Res Residual Frequencyat fOSC2 fOSC and Higher Harmonics
PAL/SECAM
PAL/SECAM
mVPP
mVPP
FILTERS
VTUN1 Tuning Voltage Range (Pin8) 3.2to4.8 V
VTUN2 Cloche Tuning Voltage Range (Pin9) 2.5to6.5 V DELAY LINE
td1p Delay Time PAL SVHS mode 330 370 400 ns
td2 Delay Time SECAM SVHS mode 500 540 580 ns
td3p Delay Time PAL CVBS mode 390 425 460 ns
td4 Delay Time SECAM CVBS mode 550 590 630 ns
SHARPNESS CIRCUIT (PAL only)
fSharp Center Frequency SVHS mode 2.5 MHz
GSharp Gain Variation from Min.to Max. Sharp at fSharp 6dB
Overshoot Amplitude Variation comparedto B/W 2T pulse, Sharp Max. 150 %
Pre-shoot Amplitude Variation comparedto B/W 2T pulse, Sharp Max. -15 %
After-shoot Amplitude Variation comparedto B/W 2T pulse, Sharp Max. -40 %
Coring Coring Range comparedto B/W 10 % TRAP FILTER
fTrap Trap Frequency PAL -0.2 fOSC +0.2 MHz
Trap Frequency SECAM -0.2 4.25 +0.2 MHz
QTrap Trap Quality Factor
(Q=1/(fo/f-3dB- f-3dB/fo))
Sharpness Min.
Sharpness Max.
CRejPN Color Subcarrier Rejection PAL mode, Sharpness Min. 20 dB
CrejS Color Rejection SECAM Mode at 4.1MHz 4.4MHz
CHROMINANCE BANDPASS Center Frequency -0.25 fosc +0.25 MHz
QBP Bandpass Quality Factor 2.8 3.5 4.2 -
CLOCHE FILTER
fCloche Resonant Frequency 4.286 MHz
QCloche Cloche Quality factor 14 16 18 -
ACC CAPACITOR (Pin5)
IC5 Charging Current During burst gate window 250 μA
IL5 Leakage Current 0.2 1 μA
CHROMA PLL (Pins 2-3)
CR2-3 Catching Range Q= 4.43MHz (Pin3) ±600 Hz
STV2112B
11/24
ELECTRICAL CHARACTERISTICS (VCC =9V,Tamb =25oC, unless otherwise specified) (continued)
Symbol Parameter Test Conditions Min. Typ. Max. UnitPLL LOOP FILTER (Pin4)
IC4 Control Current During burst gate window 400 μA
IL4 Leakage Current 5 μA
COLOR DIFFERENCE OUTPUT SIGNALS (Pins 40-41)
PAL DEMODULATOR
VP40 R-Y Output signal Amplitude (Pin 40) |RED-BLUE| axes=90o
100/75 colour bar
0.40 0.52 0.60 VPP
VP41 B-Y Output Signal Amplitude (Pin 41) |RED-BLUE| axes=90o
100/75 colour bar
0.50 0.66 0.80 VPP
GPAL Gain Ratioof both Demodulators(B-Y)/(R-Y) |RED-BLUE| axes=90o
100/75 colour bar
1.15 1.27 1.45 -
VPNDC Output Voltage when colourkilled 5.6 5.8 6.0 V
SECAM DEMODULATORS
VS40 R-Y Output Signal Amplitude (Pin40) 100/75 Colour Bar 0.8 1.05 1.20 VPP
VS41 B-Y Output Signal Amplitude (Pin 41) 100/75 Colour Bar 1.00 1.33 1.40 VPP
GSECAM Gain Ratioof both Demodulators(B-Y)/(R-Y) 1.00 1.27 1.35 -
VSDC Output Voltage when colourkilled 5.4 5.6 5.8 V
PAL /SECAM MATRIX
G/R (G-Y)/(R-Y) -0.6 -0.51 -0.4 -
G/B (G-Y)/(B-Y) -0.28 -0.19 -0.15 -
SATURATION CONTROL
SATMax. Maximum SaturationControl (3F) 1VPP CVBSon Pin20 5 +6.5 8 dB
SATNom. Nominal Saturation Control (20) 1VPP CVBSon Pin20 0 dB
SATMin. Minimum Saturation Control(00) 1VPP CVBSon Pin20 -44 dB
COLOUR DIFFERENCE INPUT SIGNALS (Pins 38-39)
DCRYI DC Voltage Pin39 No colour 2.6 2.8 3.0 V
DCBYI DC Voltage Pin38 No colour 2.6 2.8 3.0 V
VRYI Input Signal Amplitude Pin39 100/75 colorbar 1.05 VPP
VBYI Input Signal Amplitude Pin38 100/75 colorbar 1.33 VPP
ICL38-39 Clamping Current During burst key 150 μA
SYNC. SEPARATOR
VSync Sync. Pulse Amplitude On Pin20 50 300 mV
HORIZONTAL OSCILLATOR
fH50 Frequency after Divider 50Hz input signal 15625 Hz
fRang Frequency Control Range Low Frequency
High Frequency
ffree Free RunningFrequency when PLL1 open Value 03hex register 0Ehex
15000 15800 Hz
FIRST LOOP FILTER (Pin33)
ILOW-33 Long Time Constant Output Current 0.12 0.15 0.18 mA
IHIGH Short Time Constant Output Current 0.35 0.45 0.55 mA VLOW Very LongTime Constant 0.02 0.03 0.05 mA
SECOND CONTROL LOOP
CRQ2 Control Range from Startof Horizontal
Outputto Flyback
Horizontal position
centered
2to14 μs
tshift Horizontal Shift Range 4 μs
112B
STV2112B12/24
