AK8859VN Datasheet, PDF (16/72 Pages) Asahi Kasei Microsystems – NTSC/PAL/SECAM Digital Video Decoder

[AK8859VN]
[6.] Functional overview
○ It accepts composite video signal (CVBS) and S-Video with 2 input pins available for this purpose. The
decode signal is selected via register setting.
○ It can decode the following input video signal via register setting:
• NTSC-M, J / NTSC-4.43 / PAL-B,D,G,H,I,N / PAL-Nc / PAL-M / PAL-60 / SECAM
• In addition, it has auto detection mode via register setting which automatically recognizes the input
signal category.
○ It output interface is ITU-R BT.656 compliant.
(It may not be possible, however to meet these requirement if the input signal quality is poor.)
○ For connection of devices having no ITU-R BT.656 interface, it shows the active video region by
DVALID signal output.
○ Its analog circuit of the AK8859VN clamps the input signal to the sync tip. Its digital circuit clamps the
digitized input data to the pedestal level.
○ Its VBI data slicing function enables output of the slicing results as ITU-R BT.601 format digital data.
○ It has digital PGA built internally and can be adjusted in the range of −4.06dB～6.90dB by register
setting.
○ Its adaptive AGC function enables measurement of the input signal size and determination of the input
signal level.
○ It performs adaptive two-dimensional Y/C separation, in which its phase detector selects the best
correlation from among vertical, horizontal, and diagonal samples and optimum Y/C separation mode.
○ Its digital pixel spacing adjustor can align vertical positions by vertical pixel positioning.
○ Its operates in line-locked, frame-locked, or fixed clock mode with automatic transition and optimum
mode selection by automatic scanning.
○ Its ACC function enables measurement of the input signal color burst size and determination of the
appropriate color burst level.
○ It judges the chroma signal quality from the color burst of the input signal, and can apply color kill if the
signal quality is judged insufficient. It can also apply color kill if the color decode PLL clock control.
○ Its image quality adjustment function includes contrast, brightness, hue and color saturation
adjustment.
○ It can decode conflated Closed Caption Data, Closed Caption Extended Data, WSS, VBID(CGMS-A)
and write them separately to the storage register.
○ Its monitoring register enables monitoring of a number of internal functions.
○ Its enables Macrovision signal type notification, in cases where the Macrovision signal is included in
the decoded data.
MS1179-E-00
AKM Confidential
- 16 -
2010/04