ASAHI KASEI [AK8850]
AK8850
NTSC Digital Video Decoder

General Description
The AK8850 decodes NTSC composite video, S-Video and Component Video signals (525/625) into digital
formats. Digital output conforms to ITU-R BT.601 and ITU-R BT.656* YCrCb specifications. The AK8850 outputs
a control signal to generate clocks synchronized with either Horizontal Sync or Vertical Sync signals. Its clock rate
is 27 MHz.
An encoded VBID Closed Caption signal can be extracted from the video signal and sent to an external pin on the
AK8850.

Features
null NTSC-M Composite signal and S-Video signal decoder
null Component Video decoder for 525 / 625 systems ( Betacam,MII,EBU N10 )
null On-chip triple 10-Bit ADCs ( 27 MHz operation )
null On-chip Programmable Gain Amp ( PGA ), ranging from 0 dB to 12 dB in 0.1 dB / steps
null Input-synchronized clock is generated by an external VCXO
null Sub-Carrier generation by Digital Synthesizer ( DFS )
null Auto Color Control ( ACC )
null Auto Gain Control ( AGC )
null Adaptive 3-line Y-C separation
null ITU-R BT.656 format output ( 4:2:2 8-Bit parallel output with EAV / SAV )
null NTSC Closed Caption signal decoding function
null VBID Program condition decoding function
null WSS Program condition decoding function
null Video Aspect Signal decoding function on Line 16 and Line 279
null Sleep function
null 6–channel Analog inputs
null I2C Control
null 3.3 V CMOS
null 100-Pin LQFP package


note: * ITU-R BT.656 spec may not be satisfied, as it is dependent upon input signal quality.



Rev.0 1 2002/01