AK8858 Datasheet, PDF (20/96 Pages) Asahi Kasei Microsystems – PS/SD Multi Format Video Decoder

[6] Functional overview
[AK8858]
The following key functions are characteristic of the AK8858 and its operational performance.
(1) It accepts composite video signal (CVBS), S-video and component YPbPr input with 10 input pins available
for this purpose.The decode signal is selected via register setting.
(2) It contains an internal analog band limiting filter (anti-aliasing) in front of the AD converter input.
(3) Its analog circuit clamps the input signal to the sync tip (analog sync tip clamp). Its digital circuit clamps the
digitized input data to the pedestal level (digital pedestal clamp).
(4) It has auto detection mode via register setting which automatically recognizes the input signal category.
(5) Its adaptive AGC function enables measurement of the input signal size and determination of the input
signal level.
(6) Its ACC function enables measurement of the input signal color burst size and determination of the
appropriate color burst level.
(7) 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.
(8) Its digital pixel spacing adjustor can align vertical positions by vertical pixel positioning.
(9) Its operated in line-locked, frame-locked, or fixed clock mode with automatic transition and optimum mode
selection by automatic scanning.
(10) In PAL-B, D, G, H, I and N decoding, it can perform phase-difference correction for each line.
(11) Its output interface is ITU-R BT.656 (EAV/SAV) compliant. For connection of devices having no ITU-R
BT.656 interface, it shows the active video region by HD/ VD/ DVALID/ FIELD signal output.
(12) Its output data format is in YCbCr format and RGB (8:8:8) format.
(13) 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.
(14) Its image quality adjustment function includes contrast, brightness, hue, color saturation, and sharpness
adjustment.
(15) Its luminance and color signal band limiting filter are adjustable via register setting.
(16) It can decode conflated closed caption data, WSS signals, VBID(CGMS-A) and write them separately to
the storage register.
(17) Its enables Macrovision signal type notification, in cases where the Macrovision signal is included in the
decoded data.
MS1230-E-00
- 20 -
2010/9