NTE739
Integrated Circuit
Dual Doubly Balanced Chroma Demodulator
with RGB Matrix and Chroma Driver Stages
Features:
D
Luminance Input Provided
D
Good Chroma Sensitivity0.36V
pp
Input for 5V
pp
Output
D
Low Differential Output DC Offset Voltage0.6V Max
D
DC Temperature Stability 3mV/
C Typ
D
Negligible Change in Output Voltage Swing and Varying 3.58MHz Reference Input Signal
D
High Ripple Rejection Achieved with MOS Filter Capacitors
D
High Blue Output Voltage Swing10V
(pp)
Typ
D
Blanking Input Provided
D
ShortCircuit Protected Outputs
Absolute Maximum Ratings:
Power Supply Voltage
30V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chroma Signal Input Voltage
5.0V
(pk)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference Signal Input Voltage
5.0V
(pk)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum Load Resistance
2.2k
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Luminance Input Voltage
12V
(pp)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blanking Input Voltage
7.0V
(pp)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation (Package Limitation), P
D
625mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Derate Above T
A
= +25
C
5.0mW/
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range (Ambient), T
opr
0
to +75
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics:
(V
CC
= 24V, V
ref
= 1.0V
(pp)
, R
L
= 3.3k
, T
A
= +25
C unless otherwise
specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
Static Characteristics
Quiescent Output Voltage
14.3
15.0
16.3
V
Quiescent Output Current
R
L
=
6.0
mA
R
L
= 3.3k
19.0
25.5
mA
Reference Input DC Voltage
6.8
V
Chroma Input DC Voltage
3.6
V
Differential Output Voltage
0.3
0.6
V
Output Temperature Coefficient
3.0
mV/
C
Electrical Characteristics (Cont'd):
(V
CC
= 24V, V
ref
= 1.0V
(pp)
, R
L
= 3.3k
, T
A
= +25
C unless
otherwise specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
Dynamic Characteristics
Detected Output Voltage
+ (BY)
Note 1
4.0
5.0
V
(pk)
(BY)
4.0
5.0
V
(pk)
Chroma Input Voltage
BY Output = 5V
PP
, Note 1
0.36
0.7
V
PP
Luminance Input Resistance
100
k
Luminance Gain from Pin3 to Outputs
At DC
0.95
At 5MHz
0.5
Blanking Input Resistance
1Vdc
1.1
k
0Vdc
7.5
k
Detected Output Voltage
GY Output
Adjust BY Output to 5V
PP
,
0.75
1.0
1.25
V
PP
RY Output
Luminance Voltage = 23V
3.5
3.8
4.2
V
PP
Relative Output Phase
BY to RY Output
BY Output = 5V
PP
,
101
106
111
deg
BY to GY Output
Luminance Voltage = 23V
248
256
264
deg
Demodulator Unbalance Voltage
No Chroma Input Voltage and Nominal
Reference Signal Input Voltage
100
500
V
PP
Residual Carrier and Harmonics Output
Voltage
With Input Signal Voltage,
Nominal Reference Signal Voltage,
and BY Output = 5V
PP
1.0
V
PP
Reference Input Resistance
2.0
k
Reference Input Capacitance
6.0
pF
Chroma Input Resistance
2.0
k
Chroma Input Capacitance
2.0
pF
Note 1. With Normal Reference Input Signal Voltage, Adjust Chroma Input Signal Voltage to
1.2V
(pp).
Note 2. With Normal Reference Input Signal Voltage, Adjust Chroma Input Signal Voltage Until the
Blue Output Voltage = 5V
(pp)
. The Chroma Input Voltage at this point should be equal to
or less than 0.7V
(pp)
.
V
CC
Pin Connection Diagram
R Y Chroma Input
B Y Ref Input
1
2
3
4
G Y Output
R Y Output
Luminance Input
B Y Output
5
DC Ref Input
6
Blanking Input
7
GND
14
13
12
11
R Y Ref Input
N.C.
10
Chroma DC Input
9
8
B Y Chroma Input
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