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