General Description

The AK8855 decodes the NTSC, PAL Composite Video signal into Digital code. Outputs are ITU-R BT. 601 Level compatible Y, Cb and Cr signals. Decoded results are scaled to QVGA/CIF sizes etc..

Output interface is camera-interface in ITU-R BT.656-alike output format. When such information as Closed Caption, VBID, WSS are encoded on the Video signal, each code can be read out externally.

When the Macrovision signal is super-imposed, its information can also externally be read out.

特性 Features

? NTSC-M / PAL- B, D, G, H, I Composite signal decoding process

? 2-CH input acceptable (selector is integrated on-chip )

? On-chip 10 Bit ADC (operation at 24.5454 MHz or 27 MHz )

? Fixed clock Sampling

? On-chip PLL ( 27 MHz clock generation from 24.5454 MHz )

? On-chip Quartz Crystal Oscillator circuit

? Pixel Position Correction function

? Selectable Picture sizes (QVGA / VGA / QCIF / CIF / 601 )

- Rotated Picture Mode output available (ex. QVGA : 240 X 180 )

? Selectable Output rate

(525 : 30 / 15 / 7.5 625 : 25 / 12.5 / 6.25 [ frames / sec ] )

? On-chip Anti-Aliasing Filter

? On-chip PGA ( 0 dB ~ 12 dB )

? Auto Color Control (ACC) function

? Adaptive Auto Gain Control (AGC) function

? Primary YC Separation

? Output Interface

- ITU-R BT.656-alike output format (4:2:2 8 Bit parallel output with EAV / SAV ) *

* depending on the input signal quality, ITU-R BT. 656 compatible output may not be available.

- Camera Interface

- Interface by HD / VD / DVALID signals

? Closed Caption decoding function ( to be output by register setting )

? VBID ( CGMS-A ) decoding function ( CRCC decode )

( to be output by register setting )

? WSS decoding function ( to be output by register setting )

? Macrovision signal detect function

? Power-down function

? I2C Control compatible

? Internal operating power supply 2.7 V ~ 3.3 V

? supplying I / F Power Supply ( 1.6 V ~ 2.0 V or 2.7 V ~ 3.3 V )

? Package 57 FBGA