ak4364 AKM Semiconductor, Inc., ak4364 Datasheet - Page 32

• Manufacturer Part Number: ak4364
• Description: 96khz 24bit ?? Dac With Pll And Dit
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
1. Grounding and Power Supply Decoupling
The AK4364 requires careful attention to power supply and grounding arrangements. AVDD and DVDD are usually
supplied from analog supply in system. Alternatively if AVDD and DVDD are supplied separately, the power up
sequence is not critical. AVSS and DVSS of the AK4364 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 capacitors should be near to the AK4364 as possible, with the small value ceramic capacitors being the
nearest.
2. Voltage Reference Inputs
The differential voltage between AVDD and AVSS sets the analog output range. VCOM is AVDD/2 and normally
connected to AVDD with a 0.1 F ceramic capacitor. An electrolytic capacitor 10 F parallel with a 0.1 F ceramic
capacitor attached to VCOM pin eliminates the effects of high frequency noise. No load current may be drawn from these
pins. All signals, especially clocks, should be kept away from the VCOM pin in order to avoid unwanted coupling into the
AK4364.
3. Analog Outputs
The analog outputs are single-ended outputs and 0.6x(AVDD-AVSS) Vpp (typ) centered around the VCOM voltage. 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
7FFFFF(@24bit) and a negative full scale for 800000H(@24bit). The ideal output is 0V for 000000H(@24bit).
MS0014-E-02
Digital Ground
Note: AVSS and DVSS must be connected to the same analog ground plane.
Controller
System
Figure 14. Ground Layout
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Analog Ground
10
11
12
1
2
3
4
5
6
7
8
9
MCKO
TX
DVDD
DVSS
MCKI
BICK
SDTI
LRCK
PDN
CSN
SCL
SDA
AK4364
AOUTR
AOUTL
VCOM
AVDD
AVSS
CAD1
CAD0
DZF
TST
FLT
TTL
I2C
24
23
22
21
20
19
18
17
16
15
14
13
[AK4364]
2001/05