AK8857VQ Datasheet, PDF (21/105 Pages) Asahi Kasei Microsystems – Dual Channel Digital Video Decoder

[AK8857VQ]
Output Data Format Setting (Pixel size / progressive output)
ç The AK8857 can convert the output pixel size from the original input pixel size.
The AK8857 also can convert the interlaced input signal to progressive output signal.
ç The AK8857 supported output format is shown below
Input signal
Output pixel size
Interlace / Progressive Output Clock
output
Notes
525 Line
720x487 (ITU-R BT.601)
Interlace
27MHz
NTSC-M, J,
NTSC-4.43,
PAL-M,
PAL-60
800x480 (WVGA)
640x480 (VGA)
Progressive
Interlace
Progressive
Interlace
Progressive
54MHz
(*1)
27MHz
54MHz
(*1)
27MHz
54MHz
(*1)
400x240 (WQVGA)
Progressive
27MHz
(*2)
320x240 (QVGA)
Progressive
27MHz
(*2)
400x234(EGA)
Progressive
27MHz
(*2)
480x240(WEGA1)
Progressive
27MHz
(*2)
480x234(WEGA2)
Progressive
27MHz
(*2)
625 Line
720x576 (ITU-R BT.601)
Interlace
27MHz
PAL-B,D,G,H,I,N,
PAL-Nc
SECAM
800x480 (WVGA)
640x480 (VGA)
Progressive
Interlace
Progressive
Interlace
54MHz
(*1)
27MHz
54MHz
(*1)
27MHz
Progressive
54MHz
(*1)
400x240 (WQVGA)
Progressive
27MHz
(*2)
320x240 (QVGA)
Progressive
27MHz
(*2)
400x234(EGA)
Progressive
27MHz
(*2)
480x240(WEGA1)
Progressive
27MHz
(*2)
480x234(WEGA2)
Progressive
27MHz
(*2)
(*1) Interlcae signal to progressive signal conversion is using line repeating process.
The Frame rates for progressive output signal is selectable between 30frm/sec* and 60frm/sec*.
(*2) Only progressive output is support for this section.
It’s not mentioned here, during the pixel size conversion the data is interpolar before being generated
at the output.
If the input signal quality is poor, there is a case where it cannot satisfy the timing diagram shown
below.
Example: If the input signal line is shortened than the normal, it will effect EAV sync signal and HD
signal timing for the next line and for that reason the output signal will be effected as well.
*frm/sec: Frame number in 1 sec
MS1189-E-01
-21-
2010/12