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BA7071

SYNC separator IC with AFC

ROHM Semiconductor 

Multimedia ICs

•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.

fH • O = 1.57E6 [kHz]

R1

BA7071F

(3) Vertical synchronization separation circuit

When a video signal is input, synchronization signal

separation is done over the vertical synchronization

pulse interval.

(4) VIN, HD, and VD timing charts

NTSC signal

Odd field (IN)

Vertical synchronization pulse interval

1 / 2H

NTSC signal

Even field (IN)

VD

(OUT)

VIN, VD phase difference

HD, VD phase difference 1

HD, VD phase difference 2

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.

Fig. 2

•Attached components

Resistor R1 should have a tolerance of ± 2%, and a

temperature coefficient of 100ppm or lower.

5

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