TDA8215B View Datasheet(PDF) - STMicroelectronics
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TDA8215B Datasheet PDF : 9 Pages
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TDA8215B
Figure 3 : Line Oscillator
Vcc1
R5
Phase
comparator
output
11
R4
The oscillator thresholds are internally fixed by
resistors. The discharge of the capacitor depends
on the internal resistor R4. The control voltage is
applied on resistor R5.
Figure 4 : Phase Comparator
comparatoris an alternatively negative and positive
current. The frame sync-pulse inhibits the compa-
rator to prevent frequency drift of the line oscillator
on the frame beginning.
Figure 5
Vcc1
Line
Flyback
Integrated
Flyback
Sync pulse
12
Vc
SL2
ST1
13
Vc
Output
Current
The sync-pulse drives the current in the compara-
tor. The line flyback integrated by the external net
work gives on pin 13 a saw tooth, the DC offset of
this saw tooth is fixed by VC. The comparator
output provides a positive current for the part of the
signal on pin 13 greater than to VC and a negative
current for the other part. When the line flyback and
the video signal are synchronized, the output of the
Line output (Pin 17)
It is an open-collector output. The output negative
pulse time is 22µs for a 64µs period.
The oscillator thresholds are internally fixed by
resistors. The oscillator is synchronized during the
last half free run period. The input current during
the charge of the capacitor is less than 100nA.
6/9
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