AK8850 Datasheet | Asahi Kasei Microdevices

.. ASAHI KASEI [AK8850] NTSC Digital Video Decoder General Description The AK8850 decodes NTSC posite video, S-Video and ponent Video signals (525/625) into digital formats. Digital output conforms to ITU-R BT.601 and ITU-R BT.656- YCr Cb 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 NTSC-M posite signal and S-Video signal decoder ponent Video decoder for 525 / 625 systems ( Betacam,MII,EBU N10 ) On-chip triple 10-Bit ADCs ( 27 MHz operation ) On-chip Programmable Gain Amp ( PGA ), ranging from 0 d B to 12 d B in 0.1 d B / steps Input-synchronized clock is generated by an external VCXO Sub-Carrier generation by Digital Synthesizer ( DFS ) Auto Color Control ( ACC ) Auto Gain Control ( AGC ) Adaptive 3-line Y-C separation ITU-R BT.656 format output ( 4:2:2 8-Bit parallel output with EAV / SAV ) NTSC Closed Caption signal decoding function VBID Program condition decoding function WSS Program condition decoding function Video Aspect Signal decoding function on Line 16 and Line 279 Sleep function 6- channel Analog inputs I2C Control 3.3 V CMOS 100-Pin LQFP package note: - ITU-R BT.656 spec may not be satisfied, as it is dependent upon input signal quality. Rev.0 2002/01 .. ASAHI KASEI 1. Functional Block Diagram IVCXO CLK CLKINV [AK8850] NSTD LLPF LLPFC FLPF FLPFC IRef R1 CLOCK Module 27MHz Phase Error Timing Contorller & NSIG CLK27MOUT HALFCLKOUT DVALID/VLOCK VSYNC HSYNC FIELD FRAME0 FRAME1/CSYNC Luma Processing & VCO Controller & Sync-Separatio n & Registers AGC Info. EXTCLP & Closed Caption VBID Extraction AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 SYNC1 SYNC2 SYNC3 FBCAP1 FBCAP2 FBCAP3 CLPCAP1 CLPCAP2 VREF 13.5MHz Analog Multiplexer Clamp PGA Sync Separator...