[AK4359A]
Analog Ground
Digital Ground
1
2
MCLK
DZF1 30
DZF2 29
AVDD 28
AVSS 27
VCOM 26
LOUT1 25
ROUT1 24
BICK
AK4359A
3
SDTI1
LRCK
RSTB
4
5
System
Controller
6
SMUTE/CSN/CAD0
ACKS/CCLK/CSL
7
8
DFS0/CDT/SDA
SDTI2
P/S
23
9
LOUT2 22
ROUT2 21
LOUT3 20
SDTI3
10
11 SDTI4
12 TDM0
13 DEM0
ROUT3
19
LOUT4 18
ROUT4 17
DEM1/I2 16
14
15
DVDD
DVSS
Figure 25. Ground Layout
AVSS and DVSS must be connected to the same analog ground plane.
1. Grounding and Power Supply Decoupling
AVDD and DVDD are usually supplied from analog supply in system and should be separated from system digital
supply. Alternatively if AVDD and DVDD are supplied separately, the power up sequence is not critical. AVSS and
DVSS of the AK4359A must be connected to analog ground plane. System analog ground and digital ground should
be connected together near to where the supplies are brought onto the printed circuit board. Decoupling capacitor,
especially 0.1μF ceramic capacitor for high frequency should be placed as near to AVDD and DVDD as possible.
2. Analog Outputs
The analog outputs are single-ended and centered around the VCOM voltage. The output signal range is typically
3.40Vpp (typ@VDD=5V). The phase of the analog outputs can be inverted channel independently by INVL/INVR bits.
The internal switched-capacitor filter and continuous-time filter attenuate the noise generated by the delta-sigma
modulator beyond the audio passband. The input data format is two’s complement. The output voltage is positive full
scale for 7FFFFFH (@24bit) and negative full scale for 800000H (@24bit). The ideal output is VCOM voltage for
000000H (@24bit).
DC offsets on analog outputs are eliminated by AC coupling since analog outputs have DC offsets of VCOM + a few mV.
MS1010-E-01
2008/10
- 31 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
