NTE790
Integrated Circuit
Dual Chroma Demodulator
Description:
The NTE790 has two sets of synchronous detectors with matrix circuits to achieve the R鈥揧, G鈥揧 and
B鈥揧 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. Emitter鈥揻ollower
output stages used to drive the high level color amplifiers have short鈥揷ircuit protection.
Absolute Maximum Rating:
(T
A
= +25擄C unless otherwise specified)
DC Supply Voltage (Pin8 to Pin14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27V
Reference Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
p鈥損
Chroma Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
p鈥損
Total Device Dissipation (Up to T
A
= +70擄C), P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530mW
Derate Above T
A
= +70擄C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.7mW/擄C
Operating Ambient Temperature Range, T
opr
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +85擄C
Storage Temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +150擄C
Lead Temperature (During Soldering, 1/32鈥?from seating plane, 10sec max), T
L
. . . . . . . . . +265擄C
Electrical Characteristics:
(T
A
= +25擄C and V+ = 24V unless otherwise specified)
Parameter
Static Characteristics
Supply Current
With Output Loads
With No Output Loads
G鈥揧, R鈥揧, B鈥揧 Outputs
Chroma Inputs
Reference Subcarrier
Demodulator Unbalance
Maximum Color Difference Output Voltage
I
T
S
1
Closed
S
1
Open
V
9
, V
11
, V
13
S
1
Closed
V
3
, V
4
V
6
, V
7
V
13
V
11
V
9
S
1
Open
S
1
Open
V
3
= v
4
= 0.6V
p鈥損
16.5
鈥?/div>
鈥?/div>
9
26.5
鈥?/div>
mA
mA
V
V
V
V
p鈥損
V
p鈥損
V
p鈥損
V
p鈥損
Symbol
Test Conditions
Min
Typ
Max Unit
13.2 14.7 15.8
鈥?/div>
鈥?/div>
鈥?/div>
8.0
5.5
1.2
3.3
6.2
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
0.8
鈥?/div>
鈥?/div>
鈥?/div>
V
9
, V
11
, V
13
V
3
= V
4
= 0
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