[AK4223]
OPERATION OVERVIEW
■ Power Up/Down
The AK4223 can be reset by bringing the RSTN pin = “L” upon power-up. In reset mode, internal resisters are initialized
and the audio and video circuits are in power-down state outputting Hi-Z signals. The RSTN pin must be “L” to execute
this reset when power up the AK4223.
■ Audio and Video Signal Inputs
1. Audio Signal Input
The ground noise is cancelled by the differential input with the same ground for L and R channels. The output of LIN and
RIN are the same phase. LIN1-6, RIN1-6 and GND1-6 pins must be AC coupled with a 0.47uF capacitor.
LIN1-6
RIN1-6
0.47μF
0.47μF
(Cable)
(Cable)
GND1-6
Figure 8. Audio Input Circuit (Differential)
LIN1-6
RIN1-6
0.47μF
0.47μF
(Cable)
GND1-6
Figure 9. Audio Input Circuit (Single-ended)
2. Video Signal Input
Sync-tip output level is fixed by the internal clamp circuit. VIN1-6 pins must be input via a 0.1uF capacitor for AC
coupling.
VIN1-6
0.1μF
0.1μF
(Cable)
(Cable)
VGND1-6
Figure 10. Video Input Circuit (Differential)
VIN1-6
0.1μF
0.1μF
(Cable)
VGND1-6
Figure 11. Video Input Circuit (Single-ended)
MS1251-E-00
11
2010/10
AKM [ ASAHI KASEI MICROSYSTEMS ]
