NTE791
Integrated Circuit
TV Chroma Amplifier Demodulator
Description:
Compromised of an independent 2stage chroma amplifier, chroma demodulators, resistor matrix,
and color difference amplifiers. The NTE791 monolithic silicon integrated circuit is one of two blocks
required for a complete color television receiver chroma system.
The chroma amplifiers contain the necessary circuitry for automatic chroma control and colorkiller
sensing and control. The demodulators and resistor matrix reconstruct the GY color chain to bypass
unwanted harmonics. The highlevel emitter follower outputs are current limited for shortcircuit
protection.
Features:
D
DC Chroma Gain Control
D
Improved Filtering for Harmonic Reduction
D
Output ShortCircuit Current Limiting
D
SelfContained Bias Regulator
D
Low Thermal Drift, Typically 1mV/
C
D
Doubly Balanced Demodulation
Absolute Maximum Ratings:
Operating Temperature Range, T
A
40
to +85
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Voltage and Current Ratings (T
A
= +25
C)
See Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current in mA
Pin #
Voltage Range in Volts
Input
Output
1
0 to +16
2
2.0
3
0 to V
CC
1.0
10
4
2.0
5
reference
1.0
50
6
0 to V
CC
7
0 to +15
8
0 to +15
9
0 to V
CC
0
Note 1
10
0 to V
CC
0
Note 1
11
0 to V
CC
0
Note 1
12
0 to +30
50
1.0
13
0 to +10
14
0 to V
CC
15
0 to +16
16
0 to +16
Note 1. Maximum continuous current output is 20mA and is limited by package power dissipation.
Short circuit current is typically 50mA.
Static Electrical Characteristics: (T
A
= +25
C, V
CC
= 24V, Note 2 unless otherwise specified)
Parameter
Pins
Test Conditions
Min
Typ
Max
Unit
Supply Current
12
40
50
mA
Input DC Voltage Chroma Demod
13
5.5
V
RY Inj.
8
6.1
V
BY Inj.
7
6.1
V
Amplifier No. 1
2
1.6
V
Amplifier No. 2
4
1.6
V
Output DC Voltage Amplifier No. 1
3
V
1
= V
14
(ACC at 1/2 Max. Gain)
18
V
V
1
V
14
= 100mV
(ACC Max Gain)
13
V
V
14
V
1
= 100mV
(ACC Min Gain)
23
V
Demodulator
9,10,11 Reference Injection = 1V
pp
13.3
14.3
15.3
V
Output Differential Voltage
for any two outputs
9,10,11 Reference Injection = 1V
pp
200
600
mV
Output Tracking Temperature
Coefficient
9,10,11
1.0
mV/
C
Amplifier No. 1 Sensitivity
2
BY = 2 V
rms
6.3
10
15
mV
rms
Amplifier No. 2 Sensitivity
4
BY = 2 V
rms
35
50
80
mV
rms
Relative Output Voltage RY
10
BY = 2 V
rms
1.4
1.52
1.68
V
rms
Relative Output Voltage GY
9
BY = 2 V
rms
300
400
500
mV
rms
Demodulator AC Unbalanced
9,10,11 Chroma Input = 0
200
mV
rms
90% Gain
11
V
6
= 3V
1.8
V
rms
10% Gain
11
V
6
= 21V
0.2
V
rms
Killer
11
V
1
V
14
= 100mV Adj to Kill
500
mV
rms
V
1
V
14
= 85mV
Output Must Recover
2.5
Note 2. ACC inputs biased from 11V thru 62k
Note 3. BY Reference Injection = 1V
pp
<
106
C
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