ASAHI KASEI
[AK4704]
AKM CONFIDENTIAL
OPERATION OVERVIEW
1. System Reset and Power-down options
The AK4704 should be reset once by bringing PDN pin = “L” upon power-up. The AK4704 has several operation modes.
The PDN pin, AUTO bit, DAPD bit, MUTE bit and STBY bit control operation modes as shown in Table 1 and Table 2.
PDN
pin
AUTO
bit
STBY
bit
MUTE
bit
DAPD
bit
Mode
Mode
0
1
“L”
*
*
*
*
Full Power-down
Auto Startup mode
(power-on default)
Standby & mute
Standby
“H”
1
*
*
*
2
3
“H”
“H”
0
0
1
1
1
0
*
*
Mute
(DAC power down)
Mute
(DAC operation)
Normal operation
(DAC power down
& Analog input)
Normal operation
(DAC operation)
4
5
“H”
“H”
0
0
0
0
1
1
1
0
6
7
“H”
“H”
0
0
0
0
0
0
1
0
*: Don’t Care
Table 1. Operation Mode Settings
MCLK,
Register
Control
Audio Bias
Video
Output
TVFB,
TVSB
Mode
BICK,
LRCK
VCRSB
Level
Pull-
Down
(**)
NOT
available
Not
needed
Power
down
0
1
Full Power-down
Hi-Z
Hi-Z
Auto Startup mode
(power-on default)
No video
input
Available
Video
input (***)
Active
(****)
Hi-Z/
Active
Active
Active
Power
down
2
3
4
Standby & mute
Active
Standby
Mute
(DAC power down)
Mute
(DAC operation)
Normal operation
(DAC power down
& Analog input)
Normal operation
(DAC operation)
Active
Power
down
5
6
7
Needed
Not
needed
Active (*)
Needed
(*): TVOUTL/R are muted by VMUTE bit in the default state.
(**): Internally pulled down by 120kohm(typ) resister.
(***): Video input to TVVIN or VCRVIN.
(****): VCRC outputs 0V for termination.
Table 2. Status of each operation modes
Rev. 0.5
2004/1
- 16 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
