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PDF NTE874 Data sheet ( Hoja de datos )
| Número de pieza | NTE874 | |
| Descripción | Integrated Circuit TV Horiz/Vert Countdown System Circuit | |
| Fabricantes | NTE Electronics | |
| Logotipo |  |
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NTE874
Integrated Circuit
TV Horiz/Vert Countdown System Circuit
Description:
The NTE874 is a monolithic bipolar/I2L integrated circuit digital sync system designed for use in con-
sumer TV applications for color/monochrome receivers or monitors. This device takes the composite
video input signal in combination with the on–chip master–scan oscillator to provide both horizontal
drive and vertical deflection output signals.
Other on–chip functions include sync separator, horizontal APC, horizontal/vertical count–down cir-
cuitry, vertical ramp generator, and horizontal drive circuit (Pulse–Width Modulator).
The NTE874 features dual–mode operation and accepts either standard or non–standard video sig-
nals. An automatic mode–recognition system forces the operation into the asynchronous mode for
non–standard sync signals.
Intended for use with 525–line systems, the NTE874 is supplied in the 28–lead dual–in–line plastic
package.
Features:
D Sync Separator
D Master Scan Oscillator (at 64 X fH)
D Automatic Phase Control (APC) of Oscillator
D Horizontal/Vertical Count–down
D Vertical Output
D Horizontal Drive Output (Pulse–Width Modulator)
Absolute Maximum Ratings:
POWER SUPPLY:
Power Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Power Supply Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75mA
Injector Supply Voltage, VINJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.75V
Injector Supply Current, IINJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150mA
1 page  
Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 12VDC, V25 = 12VDC, Pin 2, 15, 22 to
GND;, 1µF from Pin 4 to GND., 10K ohms from Pin 28 to GND., FCLK = 1MHz, (AC Coupled),
VSync 1.2V to 4V, VIV 1.9V to 2.8V, VFA 0.2V to 0.7V)
Parameter
Test Conditions
PIN # Min Typ Max Units
Vertical Drive Section (Cont’d)
Amplifier Input Voltage
Range, VD Low
100ohm (Pin 14 to GND)
11,13 – – 50 mV
V13 = 1.7V,
Set V11 for V14 = 2V
Record V11, 13; Then V13 = 4V
Record V11, 13;
Find Difference Stop Clock
When Pin Goes Low
Vertical, On–State Voltage
V12 = 0V, V11 = 3V, V13 = 5V,
I14 = –45 mA
14
1.4 –
–
V
Vertical, Off–State Current
V12 = 0V, V11 = 4V, V13 = 3V,
V14 = 5V
14
– – 2 µA
Open Loop, Small Signal
Voltage Gain
100 ohm (Pin 14 to GND)
V13 = 2V
Set V11 thru 1K ohm for
V14 = 2V
Apply 1kHz, 1VRMS to Pin 11
Thru 99 K ohm and 1µF
Avol = 20 LOG|V14 (AC)/V11
(AC))
11,14
24 33 39
dB
Mode Change
Sync = 9, Within IV Window
11,16
5
–
7
Non–Standard IV Field (See Note 6)
Count STD/NON–STD
–
Mode Change
Non–Standard Vertical
Sync Field
Count STD/NON–STD
Sync = Less than 9
11,16
5
–
7
–
Mode Change
Field Confidence Count,
NON–STD/STD
Number of New Timing
IV/Sync Periods to Return to
STD Mode
11,16
7
– 14
–
Standard Mode Divide Ratio
IV = 16800
Clock Ratio Sync = 9 )
Serrations within 384 Clock
Window (After 8 Fields, i.e: On
9th Field)
–
– – 16800
Standard Mode Vertical
Pulse Width
(See Note 7)
Number of Clock Cycles
Output is On
11 383 384 387 –
Non–Standard Mode
IV Ratio Range Can Be and
Cause Proper Syncronization,
Except for IV Ratio Range of
(16748–16832), Sync = Don’t
Care (After 7 Fields, i.e.: on
8th Field)
– 16160 – 17405
Non–Standard Vertical
Pulse Width
Number of Clock Cycles
Output is On
11 362 364 367 –
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet NTE874.PDF ] | |
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