AK4363 Datasheet, PDF (27/29 Pages) Asahi Kasei Microsystems – 96kHz 24Bit DAC with PLL

ASAHI KASEI
[AK4363]
Digital Ground
Analog Ground
System
Controller
1 MCKO
2 NC
3 DVDD
4 DVSS
5 MCKI
6 BICK
7 SDTI
8 LRCK
9 PDN
10 CSN
11 SCL
12 SDA
DZF 24
FLT 23
AVDD 22
AVSS 21
VCOM 20
AOUTL 19
AK4363
AOUTR 18
CAD1 17
CAD0 16
I2C 15
TTL 14
TST 13
Figure 10. Ground Layout
Note: AVSS and DVSS must be connected to the same analog ground plane.
1. Grounding and Power Supply Decoupling
The AK4363 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 AK4363 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 AK4363 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 0.1µF ceramic capacitor. An electrolytic capacitor 10µF parallel with a 0.1µF 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
AK4363.
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).
MS0015-E-01
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2000/07