AK4709 Datasheet, PDF (16/42 Pages) Asahi Kasei Microsystems – Low Power AV SCART Switch

[AK4709]
■ Typical Operation Sequence (auto setup mode)
The Figure 2 shows an example of the system timing at auto startup mode.
PDN pin
Auto startup enable
Low Power Mode
Low Power Mode
Low Power Mode
AUTO bit
TVVIN
don’t care No Signal
Signal in
“1”(default)
No Signal
Signal in
No Signal
don’t care
VCRVIN
Video Detect
don’t care
125ms(MAX)
No Signal
125ms(MAX)
Signal in
No Signal don’t care
TVVOUT,
Hi-Z
Active (loop-through)
Hi-Z
Active (loop-through)
Hi-Z
VCRVOUT
Audio out (DC)
(GND)
Charge pump
Active (loop-through)
50ms(MAX)
Active (loop-through)
50ms(MAX)
Figure 2. Auto Startup Mode Sequence
■ Typical Operation Sequence (except auto setup mode)
Figure 3 shows an example of the system timing at normal operation mode.
PDN pin
“Stand-by“
AUTO bit _{“1” (default)}
MUTE bit
STBY bit
“1” (default)
“1” (default)
Video Signal _{No Signal}
“Normal“
“0”
“Mute”
“0”
“1”
“0”
Signal In
“Normal“
“Stand-by“
“0”
“1”
“1”
No Signal
Video Detect ^125ms(MAX)
Video Output
Hi-z
Active
Hi-z
TV-Source
fixed to VCR in(Loop-through)
VCR in
AMP
select
“Stand-by
&
TVOUTL/R
(GND)
VCR in
VCR in
50ms(MAX) 50ms(MAX)
AMP
50ms(MAX)
Charge pump
(Note26)
VCR in
fixed to VCR in(Loop-through)
“Stand-by
&
AMP VCR in VCR in
50ms(MAX)
(Note26)
Note 26. Mute the analog outputs externally if click noise affects the system.
Figure 3. Typical Operating Sequence
MS1319-E-00
- 16 -
2011/07