AK4357VQ AKM [Asahi Kasei Microsystems], AK4357VQ Datasheet - Page 24

• Manufacturer Part Number: AK4357VQ
• Description: 192kHz 24-Bit 6ch DAC with DSD Input
• Manufacturer: AKM [Asahi Kasei Microsystems]

ASAHI KASEI
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
AK4357 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 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 F ceramic capacitor. All signals,
especially clocks, should be kept away from the VREFH pin in order to avoid unwanted coupling into the AK4357.
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
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
(@24bit) and a negative full scale for 800000H (@24bit). The ideal V
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.
MS0088-E-02
Digital Ground
Controller
System
Figure 13. Ground Layout
- 24 -
1 3
1 4
1 5
1 6
1 7
1 8
1 9
2 0
2 1
2 2
2 3
2 4
AOUT
Analog Ground
AOUT
DVSS
SDTI1
SDTI2
SDTI3
LRCK
SMUTE
CCLK
CDTI
CSN
DSDM
DCLK
N C
=(AOUT+)-(AOUT-) between AOUT+ and AOUT-.
is 0V for 000000H (@24bit).
AK4357
AOUT
) is a positive full scale for 7FFFFF
ROUT1+
ROUT1-
LOUT2+
LOUT2-
ROUT2+
ROUT2-
LOUT3+
LOUT3-
ROUT3+
ROUT3-
AVSS
AVSS
4 8
4 7
4 6
4 5
4 4
4 3
4 2
4 1
4 0
3 9
3 8
3 7
[AK4357]
2002/07