AK4359_06 Datasheet, PDF (30/33 Pages) Asahi Kasei Microsystems – 106dB 192kHz 24-Bit 8ch DAC

ASAHI KASEI
[AK4359]
Digital Ground
System
Controller
Analog Ground
1 MCLK
DZF1 30
2 BICK
3 SDTI1
DZF2 29
AK4359 AVDD 28
4 LRCK
AVSS 27
5 RSTB
VCOM 26
6 SMUTE/CSN/CAD0
LOUT1 25
7 ACKS/CCLK/CSL
ROUT1 24
8 DFS0/CDT/SDA
9 ^SDTI2
10 ^SDTI3
P/S 23
LOUT2 22
ROUT2 21
11 SDTI4
LOUT3 20
12 DIF1
ROUT3 19
13 DEM0
LOUT4 18
14 DVDD
ROUT4 17
15 DVSS
DEM1/I2 16
Figure 24. 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 AK4359 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 2’s complement. The output voltage is a positive full scale
for 7FFFFFH (@24bit) and a 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.
MS0289-E-02
- 30 -
2006/03