AK4440 AKM [Asahi Kasei Microsystems], AK4440 Datasheet - Page 28

• Manufacturer Part Number: AK4440
• Description: 192kHz 24-Bit 8ch DAC with 2Vrms Output
• Manufacturer: AKM [Asahi Kasei Microsystems]

[AK4440]
1. Grounding and Power Supply Decoupling
VDD and AVDD are supplied from the analog supply and should be separated from the system digital supply.
Decoupling capacitors, especially 0.1 μ F ceramic capacitors for high frequency bypass, should be placed as near to
VDD and AVDD as possible. The VSS1 and VSS2 must be connected to the same analog ground plane. Power-up
sequence between VDD and AVDD is not critical.
2. Analog Outputs
The analog outputs are single-ended and centered around the VSS (ground) voltage. The output signal range is typically
2.12Vrms (typ @AVDD=5V). The internal switched-capacitor filter (SCF) and continuous-time filter (CTF) attenuate
st
the noise generated by the delta-sigma modulator beyond the audio passband. Using single a 1
-order LPF
(Figure
31)
can reduce noise beyond the audio passband.
The output voltage is a positive full scale for 7FFFFFH (@24bit data) and a negative full scale for 800000H (@24bit
data). The ideal output is 0V (VSS) voltage for 000000H (@24bit data). The DC offset is ±60mV or less.
AK4440
560
Analog
AOUT
Out
2.12Vrms (typ)
3.3nF
(fc = 86.1kHz, gain = -0.85dB @ 40kHz, gain = -2.70dB @ 80kHz)
st
Figure 31. External 1
order LPF Circuit Example1
MS1088-E-01
2011/03
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