ak4420 AKM Semiconductor, Inc., ak4420 Datasheet - Page 16

• Manufacturer Part Number: ak4420
• Description: 192khz 24-bit Stereo ?? Dac With 2vrms Output
• Manufacturer: AKM Semiconductor, Inc.

1. Grounding and Power Supply Decoupling
VDD, CVDD and VSS are supplied from the analog supply and should be separated from the system digital supply.
Decoupling capacitors, especially 0.1μF ceramic capacitors for high frequency bypass, should be placed as near to VDD
and CVDD as possible. The differential voltage between VDD and VSS pins set the analog output range. The power-up
sequence between VDD and CVDD 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 @VDD=5V). The internal switched-capacitor filter (SCF) and continuous-time filter (CTF) attenuate the
noise generated by the delta-sigma modulator beyond the audio passband. Using single a 1
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.
MS0683-E-04
AK4420
AOUT
AK4420
(fc = 154kHz, gain = -0.28dB @ 40kHz, gain = -1.04dB @ 80kHz)
AOUT
47μ
Figure 11. External 1
Figure 12. External 1
Figure 12
47k
820
shows example in the case of 10kΩ, 100kΩ terminus.
470
st
st
order LPF Circuit Example1
order LPF Circuit Example2
- 16 -
1000pF
220
2.2nF
Analog
2.12Vrms (typ)
Out
100k 2.1Vrms (typ)
10k 1.92Vrms (typ)
Analog
Out
st
-order LPF
(Figure
[AK4420]
11) can
2008/06