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:
(T
A
= +25°C unless otherwise specified)
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.4V
Circuit Voltage, V
4–10
, V
16–10,
V
18–10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
17–10
to 0V
Circuit Voltage, V
5–10
, V
6–10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6V to –4V
Circuit Current, I
7
,I
8
, I
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7mA to –15mA
Circuit Current, I
11
, I
13
, I
14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3mA to –3mA
Power Dissipation (T
A
= +70°C), P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800mW
Operating Ambient Temperature Range, T
opr
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +70°C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +155°C
Electrical Characteristics:
(T
A
= +25°C unless otherwise specified)
Parameter
Total Circuit Current
Voltage Gain (Max Video)
Contrast Attenuation Ratio (Min)
Frequency Characteristics (Video)
Symbol
I
tot
A
V
A
Vmax
/A
Vmin
f
c
Test Conditions
V
CC
= 12V
Sine wave 10kHz, 100mV
rms
input,
Contrast max.,
Picture min.
Sine wave 100mV
rms
input frequen-
cy when output/input is –3dB, Pic-
ture min. (10kHz level assumed as
0dB)
Min
27
3.1
Typ
37
4.0
Max
47
4.9
0.26
–
Unit
mA
times
times
MHz
0.15 0.19
6
–
Electrical Characteristics (Cont’d):
(T
A
= +25°C unless otherwise specified)
Parameter
DC Transfer Quantity
Color Difference Voltage Amplification
B–Y
R–Y
G – Y Color Difference Ratio
Symbol
T
DC
Test Conditions
Video input 1V
P–P
(stair step),
APL 10 to 90, B output
Sine wave 10kHz, 240mV
P–P
, Pin9
output voltage gain for Pin12 input
Cosine wave 10kHz, 200mV
P–P
Pin7 for Pin15 input
Min
90
Typ
96
Max
100
Unit
%
A
V (B – Y)
A
V (R – Y)
5.1
5.1
6.6
6.6
7.9
7.9
0.40
times
times
times
G – Y/B – Y Sine wave 10kHz, 240V
P–P
, Pin12
0.28 0.34
input
cosine
wave
10kHz,
200mV
P–P
, Pin8 output ratio to Pin9
output for Pin15 input
∠(G
– Y)
In G – Y/B – Y, phase difference
between Pin8 output and Pin9 out-
put
Sine/Cosine wave 10kHz, Pin7 or
Pin9 output voltage at input 1.5V
P–P
Superimpose 3.58MHz compo-
nents at 10mV
P–P
on the video part
of stair step 1V
P–P
for measurement
with a vector scope
V
4
= 8V, VR
–4
for input invalid
Signal: VR
–5
RGB outputs
234
236
Demodulation Color (G – Y)
239
deg.
Color Difference Output Voltage (max.)
Differential Gain (Video Amp)
e
o
DG
5.5
–
6.5
–
7.6
6
V
P–P
%
Demodulation DC Output Voltage
E
O(DC)
Change
w
/Supply Voltage
E
O(DC)
Change
w
/Ambient Temperature
DC Voltage Difference between
Demodulation Outputs
∆E
X–Y
Change
w
/Supply Voltage
∆E
X–Y
Change
w
/Ambient Temperature
Pedestal Clamp Voltage
Blanking Voltage
E
O(DC)
1.3
1.9
2.4
0.32
+0.5
±300
±100
±100
1.05
1.05
V
V/V
mV/°C
mV
mV
mV
V
V
∆E
O(DC)
/V
CC
V
CC
= 12V
±20%,
V
7
= 2V
(V
CC
= 12V) RGB outputs
∆E
O(DC)
/T
A
∆E
X–Y
∆E
X–Y
/V
CC
∆E
X–Y
/T
A
V
(clamp)
V
(BLK)
V
7
= 2V (T
A
= +25°C)
T
A
= –20° to +70°C, RGB outputs
V
7
= 2V, Output differential voltage
for each of R.G.B
V
CC
= 12V
±20%,
V
7
= 2V
(V
CC
= 12V) for V
CC
= 12V
V
7
= 2V (T
A
= +25°C)
T
A
= –20° to +70°C, for T
A
= +25°C
Pulse voltage for pedestal clamp
operation
0.16 0.24
–4
–
–
–
–2
0
0
0
0.65 0.85
Pulse voltage for blanking operation 0.65 0.85
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