AK4205EN Datasheet, PDF (19/25 Pages) Asahi Kasei Microsystems – Ultra Low Noise and Distortion Headphone Amp with Analog Switch

[AK4205]
10. Recommended External Circuits
10.1. General Example of External Circuit
Figure 15 shows the system connection diagram. An evaluation board (AKD4205) is available for fast
evaluation as well as suggestions for peripheral circuitry.
Digital Ground
Analog Ground
Power Supply
4.5  6.5V
Power Supply
-5.5  -4.5V
10u 10u
0.1u 0.1u
AUX In
(Ach)
ACPU
DAC
Ach
DAC
Bch
DC 2.5V
DC 2.5V
DC 2.5V
DC 2.5V
33
MUTEN
1 NINA
2 PINA
3 AVSSA
4 NC
5 RVDD
10u 0.1u
6 RVSS
7 AVSSB
8 PINB
9 NINB
AK4205
Top View
33
0.1u 0.1u
10u 10u
AUXA
SWOUTA 27
NC 26
NC 25
CAPSS 24
SWVDD 23
SWVSS 22
470n
Css=0.1u
0.1u
DC 0V
Headphone
Ach
5VRWM
Zener
diode
Power Supply
10u
3.0  3.6V
SEL 21
NC 20
SWOUTB 19
AUXB
470n
DC 0V
Headphone
Bch
5VRWM
Zener
diode
AUX In
(Bch)
Figure 15. Circuit Example with AK4205
Note:
-
-
-
-
RVSS, SWVSS, AVSSA and AVSSB of the AK4205 must be distributed separately from the
ground of external controllers.
AVSSA, AVSSB and headphone ground must be connected to the same analog ground plane
to minimize contact impedance.
The CAPSS pin should be connected to the ground with 0.1F or more capacitor to minimize
pop & click noise by switching path.
It is recommended to connect inductors (typ. 470nF) between SWOUTA/B and headphone
outputs, and zener diodes (V_RWM = 5V) between headphone outputs and the analog ground for
a circuit design considering the IEX61000-4-2 standard.
016012367-E-00
- 19 -
2016/12