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NTE7112
Integrated Circuit
Color TV Video Signal/Chrominance
Signal Processing Circuit
Description:
The NTE7112 is an integrated circuit in an 18–Lead DIP type package designed for use in color TV
video signal and chrominance signal processing circuits.
Features:
D Chrominance signal processing circuitry for either PAL or SECAM system color TV receivers
can be made by using the NTE7112 in combination with the AN5622 and the AN5630N:
PAL System: NTE7112, AN5622
SECAM System: NTE7112, AN5622, AN5630N
D Incorporating luminance signal mixer circuit, provides R, G, B original color output
D DC Transmission Quality: 100%
D All DC controlled adjustment simplifies wiring operation (Color/Contrast/Brightness adjustment)
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.4V
Circuit Voltage, V4–10, V16–10, V18–10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V17–10 to 0V
Circuit Voltage, V5–10, V6–10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6V to –4V
Circuit Current, I7,I8, I9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7mA to –15mA
Circuit Current, I11, I13, I14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3mA to –3mA
Power Dissipation (TA = +70°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800mW
Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +70°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +155°C
Electrical Characteristics: (TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max
Total Circuit Current
Itot VCC = 12V
27 37 47
Voltage Gain (Max Video)
Contrast Attenuation Ratio (Min)
AV Sine wave 10kHz, 100mVrms input, 3.1 4.0 4.9
Contrast max.,
AVmax/AVmin Picture min.
0.15 0.19 0.26
Frequency Characteristics (Video)
fc Sine wave 100mVrms input frequen- 6 – –
cy when output/input is –3dB, Pic-
ture min. (10kHz level assumed as
0dB)
Unit
mA
times
times
MHz

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Electrical Characteristics (Cont’d): (TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
DC Transfer Quantity
TDC Video input 1VPP(stair step),
APL 10 to 90, B output
90 96 100 %
Color Difference Voltage Amplification
BY
AV (B Y) Sine wave 10kHz, 240mVPP, Pin9 5.1 6.6 7.9 times
output voltage gain for Pin12 input
RY
AV (R Y) Cosine wave 10kHz, 200mVPP 5.1 6.6 7.9 times
Pin7 for Pin15 input
G Y Color Difference Ratio
G Y/B Y Sine wave 10kHz, 240VPP, Pin12 0.28 0.34 0.40
input cosine wave 10kHz,
200mVPP, Pin8 output ratio to Pin9
output for Pin15 input
times
Demodulation Color (G Y)
(G Y)
In G Y/B Y, phase difference 234 236 239
between Pin8 output and Pin9 out-
put
deg.
Color Difference Output Voltage (max.)
Differential Gain (Video Amp)
eo Sine/Cosine wave 10kHz, Pin7 or 5.5 6.5 7.6 VPP
Pin9 output voltage at input 1.5VPP
DG Superimpose 3.58MHz compo- – – 6 %
nents at 10mVPP on the video part
of stair step 1VPP for measurement
with a vector scope
Demodulation DC Output Voltage
EO(DC) Change w/Supply Voltage
EO(DC) Change w/Ambient Temperature
DC Voltage Difference between
Demodulation Outputs
EXY Change w/Supply Voltage
EXY Change w/Ambient Temperature
Pedestal Clamp Voltage
EO(DC)
V4 = 8V, VR4 for input invalid
Signal: VR5 RGB outputs
EO(DC)/VCC VCC = 12V ±20%, V7 = 2V
(VCC = 12V) RGB outputs
EO(DC)/TA V7 = 2V (TA = +25°C)
TA = 20° to +70°C, RGB outputs
EXY
V7 = 2V, Output differential voltage
for each of R.G.B
EXY/VCC
EXY/TA
V(clamp)
VCC = 12V ±20%, V7 = 2V
(VCC = 12V) for VCC = 12V
V7 = 2V (TA = +25°C)
TA = 20° to +70°C, for TA = +25°C
Pulse voltage for pedestal clamp
operation
1.3
0.16
4
0.65
1.9
0.24
2
0
0
0
0.85
2.4
0.32
+0.5
±300
±100
±100
1.05
V
V/V
mV/°C
mV
mV
mV
V
Blanking Voltage
V(BLK) Pulse voltage for blanking operation 0.65 0.85 1.05 V

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Pin Connection Diagram
Y Signal Input 1
Picture Control 2
Y Clamp Capacitor 3
Brightness Control
Pedestal Clamp
Pulse Input
Blanking Pulse Input
4
5
6
R Output 7
G Output 8
B Output 9
18 Contrast Control
17 VCC
16 Color Control
15 R Y Signal Input
14 R Y Clamp Cap
13 G Y Clamp Cap
12 B Y Signal Input
11 B Y Clamp Cap
10 GND
18 10
19
.870 (22.1) Max
.150
(3.8)
.250
(6.35)
.100 (2.54)
.800 (20.3)
.125 (3.17) Min