AK8826 Datasheet, PDF (17/157 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

(5-2) Setting to Composite Video Encoder mode after power-up
After initializing with PDN-pin = Low, AK8826 is Composite Video Encoder mode.
(r) : Register-bit
[AK8826VN]
Power
Supply
PDN
CLKIN
PLLPDN (r)
CONVMOD[1:0] (r)
Register set (r)
DTRSTN (r)
DACnEN (r)
DATA
t >100ns ⁽¹⁾
27MHz
0x00
t > 100clk ⁽²⁾
t > 30ms ⁽³⁾
AVDD:2.7V
DVDD:1.65V
PVDD:1.65V
Fig. 12 Power-Up sequence (To set Composite Video Encoder mode after power-up)
(1) PDN-pin should be Low states more than 100ns after power-up.
(2) To initialize in Composite Video Encoder Block. Clock input is ncessary to CLKIN-pin.
DTRSTN-bit should be 0 more than 100clock count.
(3) BT656 Interface mode operation, it is more than 1-Frame periode to synchronize with input
data. To avoid displaying noise etc, DAC should be ON after synchronization.
MS0972-E-01
17
2008/12