NTE NTE874

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 consumer 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 circuitry, vertical ramp generator, and horizontal drive circuit (Pulse–Width Modulator).
The NTE874 features dual–mode operation and accepts either standard or non–standard video signals. 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
Absolute Maximum Ratings (Cont’d):
INPUTS OUTPUTS:
AGC Gate (Pin 9) Source, IEAGC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Composite Blanking (Pin 16) Sink, ICBLNK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal Drive (Pin 5) Sink, ICHD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal Output (Pin 3) Sink, ICHO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sync Separator Out (Pin 28), ISYNC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vertical Drive (Pin 14) Source, IVERT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10mA
10mA
50mA
30mA
30mA
50mA
DEVICE DISSIPATION:
Maximum Rated Junction Temperature, TJMAX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Maximim Power Dissipation, PD
Up to TA = +50°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1W
Above TA = +50°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Derate linearly at 11.1 mW/°C
AMBIENT TEMPERATURE RANGE:
Operating, TOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +85°C
Storage, TSTG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C
LEAD TEMPERATURE (DURING SOLDERING):
At distance 1/16 ± 1/32 in. (1.59 ± 0.79mm) from case for 10s max. . . . . . . . . . . . . . . . . . . . . +265°C
Standard Operating Range:
Parameter
Symbol
PIN #
Min
Typ
Max
Units
Analog Supply Voltage
VCC
7
10.9
12.0
12.9
V
Analog Supply Current
ICC
7
30
45
60
mA
Injector Supply Voltage
VINJ
10
1.3
1.6
1.9
V
PD
–
–
580
–
mW
Force Asynchronous Low (“0”)
VFAL
2
–0.5
0
+0.25
V
Force Asynchronous
VFAH
2
0.7
0.8
1.5
V
Integrated Vertical, Low
VIVL
1
–
–
1.9
V
Integrated Vertical, High
VIVH
1
2.8
–
–
V
Total Dissipation, no external loads
Electrical Characteristics: (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
7
20
45
60
mA
10
1.3
1.6
1.9
V
Power Supply Section
Supply Current
Pin 10 Open
Injector Voltage
Sync Separator/Diff. Section
Video Inverter, High Voltage
V27 = 4V, I26 = –500µA
26
4.2
5.1
5.8
V
Sync Processor, Low Voltage
V27 = 4V, I26 = 0µA
28
–
–
.1
V
21
6.5
6.8
7.5
V
OSC/Count–Down/APC Section
APC Bias
V27 = 4V, I26 = 0µA,
V21 = Open
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
OSC/Count–Down/APC Section (Cont’d)
APC Discharge
V27 = 4V, I26 = 0µA,
V21 = Open
21
6.5
6.8
7.5
V
APC Discharge
I26 = –500µA, V20 = 2V,
V21 = 2V,
V21 = VAPC Bias (above),
(Stop Clock When Pin 21
Goes Low)
21
600
803
1100
µA
APC Charge
V27 = 4V, I26 = –500µA,
V20 = 6V,
V21 = VAPC Bias (above)
21
–600
–793 –1100
µA
Phase Detector
I21 = APC Discharge–APC
Charge
21
–30
9.8
30
µA
Sync Width, Wide
Differentiation
V27 = 5V, V23 = 1MHz,
I20 = –300µA,
V26 = Sq. Wave 0 to 5V with
Ton = Toff = 31.75µs
21
5
6
8
µs
Sync Width, Narrow
Same as above except
Ton = 2µs, Toff = 61.5µs
21
1.8
2.3
2.6
µs
Phase Detector Bias
V27 = 4V
20
3.9
4.3
4.7
V
Oscillator Current 1
V24 = 3V, V23 = 6V
V21 = 8.5V
25
1.4
1.8
3.0
mA
25
.45
.5
.55
Ratio
24
4.5
4.8
5.5
V
OSC/Count–Down/APC Section
Oscillator Current Ratio
V24 = 3V, V23 = 6V,
V21 = Open, Measured I25 &
Divide by Oscillator Current 1
Oscillator Bias
+Phase Input Current
V24 = 0V
24
–230
312
–570
µA
–Phase Input Current
V23 = 0V
23
–230
331
–570
µA
Flyback Charge Current
V17 = 0V, V19 = 6V
19
–400
–501
–766
µA
Flyback Discharge Current
I17 = 700µA, V19 = 6V
19
2
2.4
3.5
mA
Flyback Input, Low Current 1
V18 = 0V
18
–3
–1
3
µA
Flyback Input, High Current 1
V18 = 2V
18
0.8
1.6
3.8
mA
Flyback Input, Low Current 2
V17 = 0V
17
–3
–.09
3
µA
Flyback Input, High Current 2
V17 = 2V
17
0.8
1.5
1.9
mA
Blanking Voltage
V18 = 2V, V23 = 1MHz, Stop
Clock when 3V < V16< 5V
16
5.8
6
6.4
V
Burst Voltage
V18 = 2V, V23 = 1MHz, Stop
Clock when V16 > 9V
16
11.2
11.95
–
V
Burst Saturation Voltage
V18 = 0V I16 = 5µA
16
–
.45
0.6
V
Blanking/Gating Section
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
Blanking/Gating Section (Cont’d)
Horizontal Blanking Starts
(See Notes: 1, 2, 4)
16
–
.07
0.6
µs
Horizontal Blanking Width
(See Notes: 2, 4, 5)
16
11.75
12.3
12.75
µs
Burst Gate Starts
(See Notes: 1, 2, 4)
16
0.15
.44
0.45
µs
Burst Gate Trailing Edge
(See Notes: 1, 2, 4)
16
8.6
–
9.8
µs
AGC Gate Starts
(See Notes: 1, 2, 4)
9
–
.37
0.9
µs
AGC Gate Width 1
(See Notes: 2, 4, 5)
9
4.25
5.3
6.25
µs
AGC Gate Width 2
(See Notes: 3, 4, 5)
9
4.25
5.2
6.25
µs
VCC = 3V, 50pF (Pin 3 to GND),
3.9 K–ohm (Pin 3 to 3V)
3
2.8
–
–
VP–P
Low Voltage Horizontal Period VCC = 3V, V23 = 1MHz
50pF (Pin 3 to GND),
3.9K–ohm (Pin 3 to 3V)
(Trigger Level 1.5V)
3
55
64
75
µs
Low Voltage Horizontal Pulse
Width Symmetry
VCC = 3V, V23 = 1MHz,
50pF (Pin 3 to GND),
3.9K–ohm (Pin 3 to 3V)
(Trigger Level 1.5V)
Find Pulse Width Divide
by Period
3
.3
.48
.7
Ratio
Pin 4 Quiescent Voltage
V6 = V8 = 6V, I5 = 20mA,
Pin 4 Open
8.4
8.7
9.1
V
Horizontal Drive Saturation
Voltage
V6 = V8 = 6V
5
–
174
225
mV
Horizontal Drive Symmetry
V6 = V8 = 6V,
200 ohm (Pin 5 to GND),
600 ohm (Pin 5 to VCC),
V4 = 15, 734Hz, 2Vp–p
5
26
29.5
33
µs
Horizontal Drive Ratio
3
–
64
–
µs
Horizontal Pulse Width
3
31
–
33
µs
Horizontal Drive Section
Horizontal Out, Low Voltage
Start
Vertical Drive Section
Ramp Leakage
V12 = 0V, V11 = 1V, V13 = 4V
11
–
.04
–3
µA
Mirror Ramp Current
I12 = 150µA, V11 = 4V,
V13 = 5V
11
–
.04
–3
µA
Ramp Charging Current,
VD High
V12 = 0V, V11 = 0V, V13 = 5V,
Stop Clock when Pin 11 Goes
High
11
–5.5
–10
–15.5
mA
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
Amplifier Input Voltage
Range, VD Low
100ohm (Pin 14 to GND)
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
11,13
–
–
50
mV
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
Non–Standard IV Field
Count STD/NON–STD
Sync = 9, Within IV Window
(See Note 6)
11,16
5
–
7
–
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
Vertical Drive Section (Cont’d)
–
–
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)
Non–Standard Vertical
Pulse Width
Sync 9 Serrations Within 384
Clock Window, Number of
Clock Cycles Output is On
11
362
364
367
–
Non–Standard Mode Asynchronous Divide Ratio
No IV or Sync Applied (After 7
Fields, i.e., on 8th Field)
11, 16
–
–
21888
–
Blanking Pulse Width
–
16
1200
1216
1220
–
Noise Mode Change
IV Outside the Range of
(16784–16832) Sync = 9
Serrations in 384 Clock Window Pulse Applied 2432 to
11520 After an IV, Pulse is 8
to 32 Clocks Wide. Resync
results in next field and is
maintained for Mode Change
Confidence Count
11,16
–
–
16800
–
Force Non–Standard Mode
IV = 16800 Sync = 9 Serrations Within 384 Clock Window. VFA Open Circuit Vertical Pulse Width M Measured
in Next Field.
11
362
364
367
µs
Note 1 All timing measurements are with reference to the leading edge of the fly–back pulse input
to Pin 18. Fly–back pulse width is 12.00 µs and it is from 0 to 5V. Fly–back pulse train should
start about 500 µs after the start of vertical drive pulse.
Note 2 Start of fly–back pulse is 90 degrees leading with clock.
Note 3 Start of fly–back pulse is 90 degrees lagging with clock.
Note 4 Threshold for measuring AGC gate and horizontal blanking is 3V and burst gate is at 9V.
Note 5. Timing measurements referenced to trailing edge of negative sync pulse input to Pin 26. The
negative sync pulse width is is 4.5µs and is from 0 to 500µA, with negative leading edge
delayed 0.5µs from the positive leading edge of the fly–back pulse. The input to Pin 27 is
+4VDC.
Note 6 IV Ratio same as in Non–Standard Mode Ratio Range Test.
Note 7 IV Ratio same as in Standard Mode Ratio Test.
Note 8 Burst Gate Start is with reference to trailing edge of sync pulse at Pin 26. Sync Pulse is a
500µA Sink Current at Pin 26.
Pin Connection Diagram
Integrated Vert Input
1
28 Sync Output
Mode Select
2
27 Composite Video Input
Horiz Output
3
26 Sync Sep Filter
Horiz Sawtooth Input
4
25 OSC Tank
Horiz Drive Output
5
24 OSC Tank Lag Input
B+ Adjust Ref
6
23 OSC tank Lead Input
VCC
Beam Current
Feedback Ref
AGC Gate Output
7
22 GND
8
21 APC Filter
9
20 Flyback Sawtooth Ramp
Shunt Reg 10
19 Flyback Sawtooth Filter
Vert Ramp Shape 11
18 Flyback Input 1
Vert Height Adjust 12
17 Flyback Input 2
16 Sandcastle Output
Vert Feedback 13
15 Vert GND
Vert Output 14
14
1
15
28
1.469 (37.32)
Max
.540
(13.7)
.250
(6.35)
.100 (2.54)
1.300 (33.02)
.122
(3.1)
Min
.600
(15.24)