AK4707 Datasheet, PDF (18/42 Pages) Asahi Kasei Microsystems – AV SCART Switch

ASAHI KASEI
[AK4707]
„ 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
Low Power Mode
Low Power Mode
TVVIN
don’t care No Signal
Signal in
No Signal
Signal in
No Signal
don’t care
VCRVIN
don’t care
No Signal
Signal in
No Signal don’t care
TVVOUT,
VCRVOUT
Hi-Z
Active (loop-through)
Hi-Z
Active (loop-through)
Hi-Z
Audio out (DC)
(GND)
Active (loop-through)
Active (loop-through)
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
AUTO bit
BIAS bit
STBY bit
“1” (default)
“1” (default)
“1” (default)
TV-Source
select
fixed to VCR in(Loop-through)
“Stand-by“
“0”
VCR in
(default)
“Mute”
“0”
“1”
“0”
AMP
“Stand-by“
“0”
“1”
“1”
VCR in
fixed to VCR in(Loop-through)
TV out
VCR in
AMP
AMP
VCR in
(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)
MS0551-E-00
- 18 -
2006/10