NTE NTE855

NTE855
Integrated Circuit
Color TV Video Monitor
Description:
The NTE855 is an integrated circuit in a 14–Lead DIP type package used to generate an RF TV signal
from baseband color–difference and luminance signals. This device contains a chroma subcarrier
oscillator, a lead and lag network, a quasi–quadrature suppressed carrier DSB chroma modulator,
an RF oscillator and modulator, and an LSTTL compatible clock driver with adjustable duty cycle. The
NTE855 may be used as a general–purpose modulator with a variety of video signal generating devices such as video games, test equipment, video tape recorders, etc.
Features:
D Single 5V Supply Operation for NMOS and TTL Compatibility
D Minimal External Components
D Sound Carrier Addition Capability
D Modulates Channel 3 or 4 Carrier with Encoded Video Signal
D Low Power Dissipation
D Linear Chroma Modulators for High Versatility
D Composite Video Signal Generation Capability
D GND–Referenced Video Prevents Overmodulation
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V
Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25W
Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13mW/°C
Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Recommended Operating Conditions:
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Luma Input Voltage, Sync Tip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1V
Luma Input Voltage, Peak White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350mV
Color Reference Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V
Color A, B Input Voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1V to 2V
Electrical Characteristics: (VCC = 5V, TA = +25°C unless otherwise specified)
Parameter
Test Conditions
Operating Supply Voltage
Supply Current
Min
Typ
Max
Unit
4.75
5.00
5.25
V
–
25
–
mA
Chroma Oscillator/Clock Driver (Measured at Pin1 unless otherwise specified)
Output Voltage, LOW
–
–
0.4
V
Output Voltage, HIGH
2.4
–
–
V
Rise Time
V1 = 0.4V to 2.4V
–
–
50
ns
Fall Time
V1 = 2.4V to 0.4V
–
–
50
ns
Duty Cycle Adjustment Range
V3 = 5V, Measured at V1 = 1.4V
70
–
30
%
Inherent Duty Cycle
No connection to Pin3
–
50
–
%
0.8
–
2.3
V
Chroma Modulator (V5 = V6 = V7 = 1.5V unless otherwise specified)
Input Common–Mode Voltage Range
Pin5, Pin6, Pin7
Oscillator Feedthrough
Measured at Pin8
–
15
31
mV(p–p)
Modulation Angle
(V7 =2V) – (V5 = 2V)
85
100
115
deg
Conversion Gain
V8/(V7 – V6); V8/(V5 – V6)
–
0.6
–
V(p–p)/V
Input Current
Pin5, Pin6, Pin7
–
–
–20
µA
Input Resistance
Pin5, Pin6, Pin7
100
–
–
kΩ
Input Capacitance
Pin5, Pin6, Pin7
–
–
5
pF
Chroma Modulator Linearity
V5 = 1V to 2V, V7 = 1V to 2V
–
40
–
%
Luma Input Dynamic Range
Pin9
0
–
1.5
V
RF Output Voltage
f = 67.25MHz, V9 = 1V
–
15
–
mVrms
Luma Conversion Gain
V9 = 0.1V to 1.oV
–
0.8
–
V/V
Chroma Conversion Gain
V10 = 1.5Vp–p, V9 = 1V
–
0.95
–
V/V
Chroma Linearity
Pin12, V10 = 1.5Vp–p
–
1
–
%
Luma Linearity
Pin12, V9 = 0 to 1.5Vp–p
–
2
–
%
Input Current
Pin9
–
–
–20
µA
Input Resistance
Pin9
–
800
–
Ω
Pin10
100
–
–
kΩ
RF Modulator
Input Capacitance
Pin9, Pin10
–
–
5
pF
Residual 920kHz
Measured at Pin12, Note 1
–
50
–
dB
Output Current
Pin12, V9 = 0
–
1
–
mA
Temperature Characteristics (VCC = 5V, TA = 0° to +70°C, IC only)
Chroma Oscillator Deviation
fo = 3.579545MHz
–
±50
–
Hz
RF Oscillator Deviation
fo = 67.25MHz
–
±250
–
kHz
±5
–
–
%
Clock Drive Duty Stability
Note 1. V9 = 1V, VC = 300mVp–p @ 3.58MHz, VS = 250mVp–p @ 4.5MHz, Source Impedance = 75Ω.
Pin Connection Diagram
Clock Output
1
14 RF Tank
OSC Input
Duty Cycle (Adjust)
2
3
GND
4
13 RF Tank
12 RF Modulator Output
11 VCC
Color B Input
5
10 Chrominance Input
Color Ref Input
Color A Input
6
7
9
8
14
8
1
7
Luminance Input
Chrom Modulator Output
.785 (19.95)
Max
.300
(7.62)
.200 (5.08)
Max
.100 (2.45)
.600 (15.24)
.099 (2.5) Min