AK4358_06 AKM [Asahi Kasei Microsystems], AK4358_06 Datasheet - Page 32

• Manufacturer Part Number: AK4358_06
• Description: 192kHz 24-Bit 8ch DAC with DSD Input
• Manufacturer: AKM [Asahi Kasei Microsystems]

ASAHI KASEI
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
AK4358 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 0.1 µ F
ceramic capacitor for high frequency should be placed as near to AVDD and DVDD as possible.
2. Voltage Reference
VREFH sets the analog output range. VREFH pin is normally connected to AVDD with a 0.1 µ F ceramic capacitor. All
signals, especially clocks, should be kept away from the VREFH pin in order to avoid unwanted coupling into the
AK4358.
3. Analog Outputs
The analog outputs are full-differential outputs and 0.5 x VREFH Vpp (typ) centered around the internal common voltage
(about AVDD/2). The differential outputs are summed externally, V
AOUT-. If the summing gain is 1, the output range is 5.0Vpp (typ @VREFH=5V). The bias voltage of the external
summing circuit is supplied externally. The input data format is 2’s complement. The output voltage(V
full scale for 7FFFFF (@24bit) and a negative full scale for 800000H (@24bit). The ideal V
(@24bit).
The internal switched-capacitor filter and external low pass filter attenuate the noise generated by the delta-sigma
modulator beyond the audio passband. DC offset on AOUT+/- is eliminated without AC coupling since the analog
outputs are differential.
MS0203-E-01
Digital Ground
Controller
System
Figure 26. Ground Layout
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14
15
16
17
18
19
20
21
22
23
24
Analog Ground
SDTI4
SDTI1
SDTI2
SDTI3
LRCK
I2C
CCLK/SCL
CDTI/SDA
CSN/CAD1
DCLK
DSDL4
DSDR4
AOUT
=(AOUT+)-(AOUT-) between AOUT+ and
AK4358
AOUT
ROUT1+
ROUT1-
LOUT2+
LOUT2-
ROUT2+
ROUT2-
LOUT3+
LOUT3-
ROUT3+
ROUT3-
LOUT4+
is 0V for 000000H
LOUT4-
AOUT
48
47
46
45
44
43
42
41
40
39
38
37
) is a positive
[AK4358]
2006/02