AK8825 Datasheet, PDF (30/162 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

(2) Composite Video Encoder mode to Component Video Encoder mode
Composite Video Encoder mode Component Video Encoder mode
CONVMOD[1:0]-bit (r)
Register Setting (r)
DACnEN-bit (r)
PLLPDN-bit (r)
SDBB-bit (r)
Data Input
CLKIN
0x01
(2)
(5)
(6)
0x00
(10)
(1)
(3)
Input
(8)
t > 1 ms
Low or High
(7)
Low or High
(4)
t >30ms
(9)
Input
[AK8825]
Fig. 22 Mode Switching sequence (Composite Video Encoder mode to Component Video Encoder mode)
(1) To avoid making noise, Black Burst Generator is On, then stop inputting data.
(2) Turns OFF DACs.
(3) Black Burst Generator OFF.
(4) Stop Clock Input to CLKIN pin.
(5) Mode Change from Composite Video Encoder mode to Component Video Encoder mode.
(6) Set Sync-mode, Output Signal etc.
(7) Chang clock, if necessary.
It is allows that changing clock without stopping clock input, however Process (6), (7) should
Be done before clock change.
(8) After Input Clock becomes stable, Internal PLL makes power-up. (PLLPDN-bit =1)
(9) After PLL becomes stable, starting input video data.
(10) Turn ON DACs after more than 30ms later
Rev-E-00
30
2008/03