[AK4129]
1. Grounding and Power Supply Decoupling
The AK4129 requires careful attention to power supply and grounding arrangements. Alternatively if AVDD and
DVDD1-4 are supplied separately, the power up sequence is not critical. VSS1-5 must be connected to the same
ground plane. Decoupling capacitors should be as near to the AK4129 as possible, with the small value ceramic
capacitor being the nearest.
2. Jitter Tolerance
Figure 50 shows the jitter tolerance to ILRCK3-1 and IBICK. The jitter quantity is defined by the jitter frequency and the
jitter amplitude shown in Figure 50. When the jitter amplitude is 0.02Uipp or less, the AK4129 operates normally
regardless of the jitter frequency.
Figure 50. Jitter Tolerance
(1) Normal Operation
(2) There is a possibility that the output data is lost.
Note
▪ Y axis is the jitter amplitude of ILRCK3-1 just before THD+N degradation starts.
1UI (Unit Interval) is one cycle of IBICK. When FSI = 48kHz, 1[UIpp]=1/48kHz=20.8μs
MS1173-E-01
2010/09
- 46 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
