NTE NTE790 Datasheet
NTE790
Integrated Circuit
Dual Chroma Demodulator
Description:
The NTE790 has two sets of synchronous detectors with matrix circuits to achieve the R–Y, G–Y and
B–Y color difference output signals. The chroma input signal is applied to Pin3 and Pin4 while the
oscillator injection signal is applied to Pin6 and Pin7. The color difference signals, after matrix, have
a fixed relationship of amplitude and phase nominally equal DC voltage levels. The outputs of the
NTE790 are suitable for driving high level color difference or R, G, B output amplifiers. Emi t t e r – f o l l o w e r
output stages used to drive the high level color amplifiers have short–circuit protection.
Absolute Maximum Rating
: (TA = +25°C unless otherwise specified)
DC Supply Voltage (Pin8 to Pin14) 27V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference Input Voltage 5V
Chroma Input Voltage 5V
Total Device Dissipation (Up to T
Derate Above T
Operating Ambient Temperature Range, T
Storage Temperature range, T
Lead Temperature (During Soldering, 1/32” from seating plane, 10sec max), T
Electrical Characteristics:
Parameter Symbol Test Conditions Min Typ Max Unit
Static Characteristics
Supply Current
With Output Loads
With No Output Loads S1 Open – 9 – mA
G–Y, R–Y, B–Y Outputs V9, V11, V13S1 Closed 13.2 14.7 15.8 V
Chroma Inputs V3, V
Reference Subcarrier V6, V
Demodulator Unbalance V9, V11, V13V3 = V4 = 0 – – 0.8 V
Maximum Color Difference Output Voltage V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
= +70°C), P
A
= +70°C 6.7mW/°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
stg
opr
D
–40° to +85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–65° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
L
(TA = +25°C and V+ = 24V unless otherwise specified)
I
T
13
V
11
V
9
S1 Closed 16.5 – 26.5 mA
S1 Open – 3.3 – V
4
S1 Open – 6.2 – V
7
V3 = v4 = 0.6V
p–p
8.0 – – V
5.5 – – V
1.2 – – V
530mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+265°C. . . . . . . . .
p–p
p–p
p–p
p–p
p–p
p–p
Electrical Characteristics (Cont’d): (TA = +25°C and V+ = 24V unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Chroma Input Sensitivity V
Relative R–Y Output V
Relative G–Y Output V
VDC Difference Between any two
|V9|–|V13| ec = 0 – – 0.6 V
Output Pins
Input Impedance Reference Subcarrier r
Input Capacitance Reference Subcarrier c
Input Impedance at Chroma Inputs r
Input Capacitance at Chroma Inputs c
Output Resistance r
Pin Connection Diagram
N.C.
N.C.
(–) Chroma
(+) Chroma
3
11
9
i6, 7
i6, 7
i3, 4
i3, 4
o
1
2
3
4
Adjust ec for 5V @ Pin13 (B–Y)
14
GND
B – Y Output
13
12
N.C.
R – Y Output
11
– 0.2 0.35 V
3.5 – 4.2 V
0.75 – 1.25 V
– 1.7 – kΩ
– 6 – pF
– 0.95 – kΩ
– 6 – pF
– 180 – Ω
p–p
p–p
p–p
5N.C.
6R – Y Injection
7B – Y Injection
10 N.C.
G – Y Output
9
V
8
CC
14 8
17
.785 (19.95)
Max
.200 (5.08)
Max
.300
(7.62)
.100 (2.45)
.600 (15.24)
.099 (2.5) Min
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