SPCA711A View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

SPCA711A

DIGITAL VIDEO ENCODER FOR VIDEOCD

Unspecified 

SPCA711A

VERTICAL BLANKING INTERVALS

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 of

theNTSC and every 8 fields of thePAL. The SCA phase is non-zero and depends upon the clock frequency and

the video format.

For perfect clock input, the burst frequency is 4.43361875 MHz for PAL-B, D, G, H, I, 3.57561149MHz for PAL-

M, 3.58205625MHz for PAL-Nc (Argentina), 3.579545 MHz for NTSC interlaced.

! POWER-DOWN MODE

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

DACs are powered down. When returned to low, 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 SPCA711A is

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

remain driven to the value of previous output before SLEEP was activated. Power down current is dependent on

loading to the HSYNC* and VSYNC* pins.

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