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BA7071F 데이터시트(PDF) 5 Page - Rohm

부품명 BA7071F
상세설명  SYNC separator IC with AFC
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제조업체  ROHM [Rohm]
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BA7071F 데이터시트(HTML) 5 Page - Rohm

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5
Multimedia ICs
BA7071F
•Circuit operation
(1) Synchronization separation circuit
Detects the charging current to a externally-connected
capacitor, and performs synchronization separation.
(2) Horizontal oscillation circuit
When a video signal is input, it is synchronized with
Hsync by the PLL. The horizontal free-running frequen-
cy is determined by external resistor R1.
(3) Vertical synchronization separation circuit
When a video signal is input, synchronization signal
separation is done over the vertical synchronization
pulse interval.
fH • O =
[kHz]
1.57E6
R1
(4) VIN, HD, and VD timing charts
1 / 2H
VD
(OUT)
VIN, VD phase difference
Vertical synchronization pulse interval
NTSC signal
Odd field (IN)
NTSC signal
Even field (IN)
HD
Odd field (OUT)
HD
Even field (OUT)
1. The rise and fall positions for VD are basically the same for both odd and even fields.
2. HD shifts by 1 / 2H during the odd and even field interval.
3. Only the odd field is given for the specification.
HD, VD phase difference 1
Fig. 2
HD, VD phase difference 2
•Attached components
Resistor R1 should have a tolerance of ± 2%, and a
temperature coefficient of 100ppm or lower.


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