ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 29

• Manufacturer Part Number: ak8825
• Description: Hd/sd Multi Format Video Encoder With 3ch Dac
• Manufacturer: AKM Semiconductor, Inc.

Mode switching sequence
(1) Component Video Encoder mode to Composite Video Encoder mode
Rev-E-00
Fig. 21 Mode Switching sequence (Component Video Encoder mode to Composite Video Encoder mode)
CONVMOD[1:0]-bit (r)
Register Setting (r)
DTRSTN-bit (r)
DACnEN-bit (r)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10) Turn On DACs after more than 30ms later
PLLPDN-bit (r)
HDBBG-bit (r)
Data Input
be done before clock change.
DTRSTN-bit =0 periode should be more than 100-clk counts with clock input.
To avoid making noise, Black Burst Generator is On, then stop inputting data.
Turn Off DACs.
Black Burst Generator OFF.
Set PLLPDN-bit = 0 (PLL Block becomes Power Down States)
Stop Clock Input to CLKIN pin.
Mode Change from Componet VIdeo Encoder mode to Composite Video Encoder mode.
Set Sync-mode, Output Signal etc.
Chang clock, if necessary.
Set DTRSTN=1 after DTRSTN-bit =0.
It is allows that changing clock without stopping clock input, however Process(6), (7) should
CLKIN
Component Video Encoder mode
(1)
Input
(2)
0x00
(3)
(4)
(5)
29
Low or High
Low or High
(6)
(7)
Composite Video Encoder mode
PLL is Power Down State
(8)
(9)
t >100clk
(10)
0x01
t >30ms
Input
2008/03
[AK8825]