AK4346 Datasheet, PDF (28/31 Pages) Asahi Kasei Microsystems – 3.3V 192kHz 24-Bit 6-Channel DAC

ASAHI KASEI
[AK4346]
Digital Ground
System
Controller
Analog Ground
1 MCLK
DZF1 30
2 BICK
3 SDTI1
TDM0/DZF2 29
AK4346 AVDD 28
4 LRCK
AVSS 27
5 PDN
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 TST1
LOUT3 20
12 DIF1
ROUT3 19
13 DEM0/CAD1
TST3 18
14 DVDD
TST2 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 the analog supply in the system and it 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 AK4346 must be connected to the analog ground plane. System analog ground and digital ground
should be connected together close to where the supplies are brought onto the printed circuit board. A decoupling
capacitor, typically a 0.1µF ceramic capacitor for high frequency bypass, 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
2.24Vpp (when AVDD=3.3V). The phase of the analog outputs can be inverted channel independently by the
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 (@24-bit) and a negative full scale for 800000H (@24-bit). The ideal output is VCOM
voltage for 000000H (@24-bit).
DC offsets on the analog outputs are eliminated by AC coupling since the analog outputs have DC offsets of VCOM + a
few mV.
MS0531-E-00
- 28 -
2006/07