SPCA701A View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

SPCA701A

DIGITAL VIDEO ENCODER FOR VIDEOCD

Unspecified 

Preliminary

SPCA701A

VERTICAL BLANKING INTERVALS

For NTSC, scan lines 1-9 and 263-272, inclusive, are always blanked. There is no setup on scan lines 10-21

and 273-284 inclusive. All displayed lines in the vertical blanking interval (10-21 and 273-284 for interlaced

NTSC; 7-13 and 320-335 for interlaced PAL-B, D, G, H, I) are forced to blank. For PAL-B, D, G, H, I, scan lines

1-6, 311-318, and 624-625, inclusive, during fields 1, 2, 5, and 6, are always blanked. During fields 3, 4, 7, and

8, scan lines 1-5, 311-319, and 624-625, inclusive, are always blanked.

DIGITAL PROCESSING

Once the input data is converted into internal YUV format, the UV components are low-pass filtered with a filter.

The Y and filtered UV components are up-sampled to CLK frequency by a digital filter.

SUBCARRIER GENERATION

To maintain a synchronous sub-carrier relative to HSYNC*, the sub-carrier phase is reset every frame for NTSC

and every 8 fields for PAL. The SCA phase is non-zero and depends upon the clock frequency and the video

format.

For a perfect clock input, the burst frequency is 4.43361875 MHz for PAL-B, D,

G, H, I, 3.579545 MHz for NTSC interlaced.

POWER-DOWN MODE

In power-down mode (SLEEP pin set to 1), the internal clock is stopped and also an internal reset is forced and

the DACs are powered down. When returned high, the device starts from a reset state (horizontal and vertical

counters = 0, which is the start of VSYNC in Field 1). This mode should be set when the SPCA701A may be

subjected to clock frequencies outside its functional range. If Master = 1, the HSYNC* and VSYNC* pins remain

driven to the value previously output before SLEEP was activated and power down current is dependent on

loading on the HSYNC* and VSYNC* pins.

Sunplus Technology Co., Ltd.

7

Rev.: 0.2 1999.12.07

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