TDA8214 ST Microelectronics, TDA8214 Datasheet - Page 6

• Manufacturer Part Number: TDA8214
• Description: HORIZONTAL AND VERTICAL DEFLECTION CIRCUIT
• Manufacturer: ST Microelectronics

TDA8214B
6/9
Figure 3 : Line Oscillator
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
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
Sync pulse
Integrated
Flyback
Output
Current
Line
Flyback
comparator
Phase
output
R5
11
R4
Vc
comparator is 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
Line output (Pin 17)
It is an open-collector output. The output positive
pulse time is 29 s for a 64 s 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.
ST1
SL2
12
Vcc1
Vcc1
13
Vc