AK8825 Datasheet, PDF (24/162 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

[AK8825]
(6) Power-Down Sequence and reset sequence after power-down release
Before setting to PDN=LOW, DTRSTN(r) should be Low to initialize.
After power-down release (PDN =LOW -> High), wait for 10ms for Analog Reference Voltage / Current becomes stable.
During PDN=Low (Power down States), either with clock-in or clock-not in is
During PDN = Low, AVDD / DVDD can be power-off.
Power down sequence is shown as Fig. 16. (r) means Register-bit.
PDN = Low makes AK8825 initialize condition, so that after power-down release, make sure register setting.
(6-1) Power-Down and power-down release Sequence from Composite Video Encoder mode
CLKIN
(27MHz)
DACnEN(r)
C O N V M O D [1 :0 ](r)
DTRSTN(r)
PDN
VREF
0x00
Fix to Low or High
t > 100clk
Register is initialized, it is
necessary to set regsiter again
10ms
Fig. 16 Power-Down and power-down release Sequence from Composite Video Encoder mode
Rev-E-00
24
2008/03