AK8851 Datasheet, PDF (50/80 Pages) Asahi Kasei Microsystems – NTSC/PAL/SECAM Digital Video Decoder

ASAHI KASEI
[AK8851]
31. Power Down Mode
The AK8851 has a Power-Saving mode. To put only the Analog functional blocks into this mode, set the input set bits
[INSEL1:INSEL0]-bit to [1,1,1] of [AFE Control Register](R/W)[Sub Address 0x00]. In this case, Analog blocks such as
Clamp, ADC1 and ADC2, including the PGAs, are switched to power saving mode. Since the digital blocks are in normal
operation, correct timing outputs are available and are externally accessible.
When a Composite signal is input, CLAMP2 / PGA2 / ADC2 blocks are automatically switched to power saving mode.
The AK8851 /PD pin is used to place the entire chip into power saving mode, including all digital blocks.
By setting /PD pin to “low”, all analog and digital blocks are put into power saving mode, and output pins become “low”. To
recover from the power saving mode using the /PD pin, a reset sequence must be executed.
MS0244-E-03
50
Confidential
2005 / 07