AK4703 Datasheet, PDF (12/38 Pages) Asahi Kasei Microsystems – AV SCART switch

ASAHI KASEI
AKM CONFIDENTIAL
[AK4703]
OPERATION OVERVIEW
1. System Reset and Power-down options
The AK4703 should be reset once by bringing PDN pin = “L” upon power-up. The AK4703 has several operation modes.
The PDN pin, AUTO bit, BIAS bit, STBY bit and AMP bit control operation modes as shown in Table 1 and Table 2
Mode
0
1
2
3
4
5
6
7
PDN pin
“L”
“H”
“H”
“H”
“H”
“H”
“H”
“H”
AUTO bit
*
1
0
0
0
STBY bit
*
*
1
1
0
0
0
BIAS bit
*
*
1
0
1
1
AMPPD bit
*
*
*
*
1
0
0
0
0
1
0
0
0
0
Table 1. Operation Mode Settings (*: Don’t Care)
Mode
Full Power-down
Auto Startup mode
(Power-on Default)
Standby & Mute
Standby
Mute
(AMP power down)
Mute
(AMP operation)
Normal operation
(AMP power down
& Analog input)
Normal operation
(AMP operation)
Mode
Register
Control
Audio Bias
Level
Video
Output
TVFB,
TVSB
VCRSB
0 Full Power-down
Not
available _{Power down}
Hi-Z
No video
Hi-Z Pull-down (*)
1
Auto Startup mode
(Power-on Default)
input
Video
input (**)
Active Active (***)
2 Standby & Mute
Power
down
3 Standby
Active
4
Mute
(AMP power down)
5
Mute
(AMP operation)
Available
Power
down
Active
Hi-Z / Active
Active
Normal operation
6 (AMP power down
& Analog input)
7
Normal operation
(AMP operation)
Active
(****)
(*): Internally pulled down by 120kΩ (typ) resistor.
(**): Video input to TVVIN or VCRVIN.
(***): VCRC outputs 0V for termination.
(****): TVOUTL/R are muted by Mute bit in the default state.
Table 2. Status of each operation modes
Rev. 0.1
- 12 -
2004/03