AK4204 Datasheet, PDF (11/13 Pages) Asahi Kasei Microsystems – Stereo Cap-less LINE-Amp and Video-Amp

[AK4204]
1. Grounding and Power Supply Decoupling
The AK4204 requires careful attention to power supply and grounding arrangements. VDD1 and VDD2 are usually
supplied from the analog supply in the system. If VDD1 and VDD2 are supplied separately, they must be powered-up at
the same time. VSS1 and VSS2 pins must be connected to the analog ground plane. System analog ground and digital
ground should be wired separately and connected together as close as possible to where the supplies are brought onto
the printed circuit board. Decoupling capacitors for high frequency should be placed as near as possible to the supply
pin.
2. Notes for Drawing a Board
Analog input and output pins should be as near as possible in order to avoid unwanted coupling into the AK4204.
Unused pins should be open.
3. Analog Input
3-1. Audio Signal Input
The audio signal inputs are single-ended input. Connect a capacitor about 1uF to each input pin for AC coupling.
3-2. Video Signal Input
Tip Sync level is fixed by an internal clamp circuit. Connect a capacitor about 0.1uF to the VIN pin for AC
coupling.
4. Analog Output
4-1. Audio Signal Output
The audio signal outputs are single-ended output. The output rages to 2.0Vrms (typ) centered VSS (0V, typ) via
LPF. The DC offset is less than ±5mV.
4-2. Video Signal Output
The integrated 1-channel video amplifier has drivability for a load resistance of 150Ω. The output gain is +6dB
(typ) via LPF. DC offset is less than ±100mV.
Rev. 0.1
- 11 -
2012/02