NTE7047 データシートの表示（PDF） - NTE Electronics

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NTE7047

Integrated Circuit TV Color Small Signal Sub System

NTE Electronics 

Notes (Cont’d):

Note19. The minimum value is obtained with a 1.8kΩ series resistor connected between Pin17 and

Pin25. The slicing level can be varied by changing the value of this resistor (a higher resist-

ance results in a larger value of the minimum sync pulse amplitude). The slicing level is inde-

pendent of the video information.

Note20. Frequency control is obtained by supplying a correction current to the oscillator RC–net-

word. This is achieved via a resistor connected between the phase 1 detector output and the

oscillator network. The oscillator can be adjusted to the correct frequency by:

S short–circuit the sync separator bias network (Pin25) to the voltage supply.

To avoid the necessity of a VCR switch, the time constant of the phase detector at strong

input signals is sufficiently short to obtain a stable picture during VCR playback. During the

vertical retrace period the time constant is even shorter so that VCR head errors are compen-

sated for at the beginning of the scan. During weak signal conditions (information derived

from the AGC circuit) the time constant is increased to obtain a good noise immunity.

Note21. This figure is valid for an external load impedance of 82kΩ connected between Pin28 and

the shift adjustment potentiometer.

Note22. The horizontal flyback input and the sandcastle output have been combined on Pin27. The

flyback pulse is clamped to a level of 4.5V. The minimum current to drive the second control

loop is 0.1mA.

Note23. The in–sync/out–of–sync and transmitter identification have been combined on Pin22. The

capacitor is charged during the sync pulse and discharged during the time difference be-

tween gating and sync pulsxe.

Note24. The vertical scan is synchronized by means of a divider system, therefore no adjustment is

required for the ramp generator. The divider detects whether the incoming signal has a verti-

cal frequency of 50Hz or 60Hz and corrects the vertical amplitude.

Note25. To avoid screenburn due to a collapse of the vertical deflection, a continuous blanking level

is inserted into the sandcastle pulse when the feedback voltage of the vertical deflection is

not within the specified limits.

Note26. These figures are based on sampled tests.

Pin Connection Diagram

AGC Takeover/X–Ray Protection 1

Vert Ramp Generator 2

Vertical Drive 3

Vertical Feeback 4

Tuner AGC 5

GND 6

VCC 7

Vision IF Input 8

Vision IF Input 9

IF AGC 10

Volume Control/Start Horiz OSC 11

Audio Output 12

Sound Demod 13

Sound IF Decouple 14

28 Phase 2 Detector

27 Sandcastle Output/Horiz Flyback Input

26 Horizontal Drive

25 Sync Separator

24 Phase 1 Detector

23 Horizontal OSC

22 Coincidence Detector

21 Vision Demod Tuned Ckt

20 Vision Demod Tuned Ckt

19 AFC S/H, AFC Switch

18 AFC Output

17 Video Output

16 GND

15 Sound IF Input

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