AK4955 Datasheet, PDF (112/117 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP/ LDO & DSP

[AK4955]
■ Video Input/Output
Clocks
VG1-0 bits
(Addr: 1AH, D3-2)
PMCP bit
(Addr: 1AH, D1)
PMV bit
(Addr: 1AH, D0)
VOUT pin
Clocks can be stopped, if only video output is enabled.
XX
0
0
VSS1
(1)
(2)
Wait time (*)
00
1
1
0
(3)
0
Normal Output
VSS1
Figure 89. Video Output Sequence
Example:
Audio Function :No use
Video Gain = +6dB
(1) Addr:1AH, Data:00H
(2) Addr:1AH, Data:03H
Video Output
(3) Addr:1AH, Data:00H
<Example>
When only the video block is in operation, the clocks are not needed.
(1) Set up the video gain (VG1-0 bits).
(2) Power up Video Amp and Charge Pump: PMV, PMCP bits = “0” → “1”
(*) Wait time is the time until the video clamp circuit output is stabled. It depends on the value of a DC cut
capacitor for the VIN pin and the DC offset voltage of a video signal.
Example) In case of the input capacitor of the VIN pin is 0.1μF and the DC offset voltage is 150mV.
Wait time = (max) 180ms
(3) Power down Video Amp: PMV, PMCP bits = “0” → “1”
The VOUT pin output is stopped and becomes 0V.
MS1343-E-00
- 112 -
2011/12