
ASAHI KASEI 
[AK4707] 
MS0551-E-00 
2006/10 
- 18 - 
Normal Operation Mode 
To change analog switches, set the AUTO bit, BIAS bit and STBY bit to “0”. The AK4707 is in power-down mode until 
PDN pin = “H”. The Figure 2 shows an example of the system timing at the power-down and power-up by PDN pin. 
Typical Operation Sequence (auto setup mode) 
Figure 2 shows an example of the system timing at auto setup mode. 
PDN pin 
Low Power Mode 
Audio out (DC)
TVVOUT, 
VCRVOUT
Active (loop-through)
TVVIN
Signal in  
No Signal 
don’t care
Signal in  
No Signal 
don’t care
VCRVIN
Signal in  
No Signal 
don’t care
don’t care
Active (loop-through) 
Hi-Z 
Hi-Z 
Active (loop-through)  
(GND) 
Active (loop-through) 
No Signal 
No Signal 
Hi-Z 
Low Power Mode
Low Power Mode 
Figure 2. Typical operating sequence (auto setup mode) 
Typical Operation Sequence (except auto setup mode) 
Figure 3 shows an example of the system timing at auto setup mode. 
PDN pin 
“1” (default) 
STBY bit
“0”
“1” 
“1” (default)
BIAS bit
“0” 
“Stand-by“ 
“1”
“0” 
“Stand-by“ 
“Mute” 
TV out
AMP 
TV-Source 
select 
VCR in 
VCR in
VCR in 
(1)
VCR in 
fixed to VCR in(Loop-through) 
(default) 
“1” (default)
AUTO bit
“0” 
AMP 
AMP
fixed to VCR in(Loop-through)
“1”
(2)
Notes:  
(1) Set the STBY bit = “0” to pass for 20.2ms after set the MUTE bit = “0”, to prevent the click noise (1). 
(2) Mute the analog outputs externally if click noise (2) affects the system. 
Figure 3. Typical operating sequence (except auto setup mode)