NTE NTE739

NTE739
Integrated Circuit
Dual Doubly Balanced Chroma Demodulator
with RGB Matrix and Chroma Driver Stages
Features:
D Luminance Input Provided
D Good Chroma Sensitivity–0.36Vp–p Input for 5Vp–p Output
D Low Differential Output DC Offset Voltage–0.6V 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 Swing–10V(p–p) Typ
D Blanking Input Provided
D Short–Circuit 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2kΩ
Luminance Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V(p–p)
Blanking Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0V(p–p)
Power Dissipation (Package Limitation), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625mW
Derate Above TA = +25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0mW/°C
Operating Temperature Range (Ambient), Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +75°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Electrical Characteristics:
(VCC = 24V, Vref = 1.0V(p–p), RL = 3.3kΩ, TA = +25°C unless otherwise
specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
Static Characteristics
Quiescent Output Voltage
Quiescent Output Current
14.3 15.0 16.3
RL = ∞
RL = 3.3kΩ
–
V
6.0
–
mA
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):
(VCC = 24V, Vref = 1.0V(p–p), RL = 3.3kΩ, TA = +25°C unless
otherwise specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
4.0
5.0
–
V(pk)
4.0
5.0
–
V(pk)
–
0.36
0.7
VP–P
100
–
–
kΩ
At DC
–
0.95
–
At 5MHz
–
0.5
–
1Vdc
–
1.1
–
kΩ
0Vdc
–
7.5
–
kΩ
Adjust B–Y Output to 5VP–P,
Luminance Voltage = 23V
0.75
1.0
1.25
VP–P
3.5
3.8
4.2
VP–P
B–Y Output = 5VP–P,
Luminance Voltage = 23V
101
106
111
deg
248
256
264
deg
Dynamic Characteristics
Detected Output Voltage
+ (B–Y)
Note 1
– (B–Y)
Chroma Input Voltage
B–Y Output = 5VP–P, Note 1
Luminance Input Resistance
Luminance Gain from Pin3 to Outputs
Blanking Input Resistance
Detected Output Voltage
G–Y Output
R–Y Output
Relative Output Phase
B–Y to R–Y Output
B–Y to G–Y Output
Demodulator Unbalance Voltage
No Chroma Input Voltage and Nominal
Reference Signal Input Voltage
–
100
500
VP–P
Residual Carrier and Harmonics Output
Voltage
With Input Signal Voltage,
Nominal Reference Signal Voltage,
and B–Y Output = 5VP–P
–
–
1.0
VP–P
Reference Input Resistance
–
2.0
–
kΩ
Reference Input Capacitance
–
6.0
–
pF
Chroma Input Resistance
–
2.0
–
kΩ
Chroma Input Capacitance
–
2.0
–
pF
Note 1. With Normal Reference Input Signal Voltage, Adjust Chroma Input Signal Voltage to
1.2V(p–p).
Note 2. With Normal Reference Input Signal Voltage, Adjust Chroma Input Signal Voltage Until the
Blue Output Voltage = 5V(p–p). The Chroma Input Voltage at this point should be equal to
or less than 0.7V(p–p).
Pin Connection Diagram
G – Y Output 1
R – Y Output 2
Luminance Input 3
14 VCC
13 B – Y Ref Input
12 R – Y Ref Input
B – Y Output 4
11 N.C.
DC Ref Input 5
10 Chroma DC Input
Blanking Input 6
9 R – Y Chroma Input
GND 7
8 B – Y Chroma Input
14
8
1
7
.300 (7.62)
.785 (19.95) Max
.200 (5.08)
Max
.100 (2.45)
.600 (15.24)
.099 (2.5) Min