NTE NTE739 Datasheet
NTE739
Integrated Circuit
Dual Doubly Balanced Chroma Demodulator
with RGB Matrix and Chroma Driver Stages
Features:
D Luminance Input Provided
D Good Chroma Sensitivity–0.36V
Input for 5V
p–p
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)
Ty p
D Blanking Input Provided
D Short–Circuit Protected Outputs
Absolute Maximum Ratings:
Power Supply Voltage 30V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chroma Signal Input Voltage 5.0V
Reference Signal Input Voltage 5.0V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum Load Resistance 2.2kΩ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Luminance Input Voltage 12V
Blanking Input Voltage 7.0V
Power Dissipation (Package Limitation), P
Derate Above T
Operating Temperature Range (Ambient), T
Storage Temperature Range, T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D
= +25°C 5.0mW/°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
opr
stg
p–p
Output
625mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0° to +75°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–65° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(pk)
(pk)
(p–p)
(p–p)
Electrical Characteristics
: (VCC = 24V, V
= 1.0V
ref
, RL = 3.3kΩ, TA = +25°C unless otherwise
(p–p)
specified)
Parameter Test Conditions Min Typ Max Unit
Static Characteristics
Quiescent Output Voltage 14.3 15.0 16.3 V
Quiescent Output Current RL = ∞ – 6.0 – mA
RL = 3.3kΩ 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, V
= 1.0V
ref
, RL = 3.3kΩ, TA = +25°C unless
(p–p)
otherwise specified)
Parameter Test Conditions Min Typ Max Unit
Dynamic Characteristics
Detected Output Voltage
+ (B–Y)
– (B–Y) 4.0 5.0 – V
Chroma Input Voltage B–Y Output = 5V
Luminance Input Resistance 100 – – kΩ
Luminance Gain from Pin3 to Outputs At DC – 0.95 –
Blanking Input Resistance 1Vdc – 1.1 – kΩ
Detected Output Voltage
G–Y Output
R–Y Output
Relative Output Phase
B–Y to R–Y Output
B–Y to G–Y Output
Note 1 4.0 5.0 – V
, Note 1 – 0.36 0.7 V
P–P
At 5MHz – 0.5 –
0Vdc – 7.5 – kΩ
Adjust B–Y Output to 5V
Luminance Voltage = 23V
B–Y Output = 5V
Luminance Voltage = 23V
P–P
,
P–P
,
0.75 1.0 1.25 V
3.5 3.8 4.2 V
101 106 111 deg
248 256 264 deg
(pk)
(pk)
P–P
P–P
P–P
Demodulator Unbalance Voltage No Chroma Input Voltage and Nominal
Reference Signal Input Voltage
Residual Carrier and Harmonics Output
Voltage
Reference Input Resistance – 2.0 – kΩ
Reference Input Capacitance – 6.0 – pF
Chroma Input Resistance – 2.0 – kΩ
Chroma Input Capacitance – 2.0 – pF
With Input Signal Voltage,
Nominal Reference Signal Voltage,
and B–Y Output = 5V
P–P
– 100 500 V
– – 1.0 V
P–P
P–P
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
or less than 0.7V
(p–p)
.
G – Y Output
R – Y Output
Luminance Input
. The Chroma Input Voltage at this point should be equal to
(p–p)
Pin Connection Diagram
1
2
3
14
V
CC
13
B – Y Ref Input
12
R – Y Ref Input
B – Y Output
4
5DC Ref Input
6Blanking Input
7GND
11
N.C.
10 Chroma DC Input
R – Y Chroma Input
9
8 B – Y Chroma Input
Loading...