AK4121A AKM [Asahi Kasei Microsystems], AK4121A Datasheet - Page 14

• Manufacturer Part Number: AK4121A
• Description: Asynchronous Sample Rate Converter
• Manufacturer: AKM [Asahi Kasei Microsystems]

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The AK4121A requires careful attention to power supply and grounding arrangements. VDD are usually supplied from
the system’s analog supply. AVSS and DVSS of the AK4121A must be connected to the analog ground plane.
System analog ground and digital ground should be connected together as close as possible to where the supplies are
brought onto the printed circuit board. Decoupling capacitors especially a 0.1μF ceramic capacitor for high frequency
noise should be placed as near to VDD as possible.
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The C1 (4.7μF) and R (560ohms) should be connected in series and attached between FILT pin and AVSS in parallel
with C2 (1.0nF). A Care should be taken to ensure that noise on the FILT pin is minimized.
MS0337-E-02
Grounding and Power Supply Decoupling
PLL Loop-Filter
Note 13. Those recommended values include temperature dependence.
Parameter
FSI range
C1
C2
R
Recommended value 1
AK4121A
Figure 11. PLL Loop-Filter
560ohm +/−8%
4.7μF +/−40%
1.0nF +/−40%
8k ~ 96kHz
FILT
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R
C1
AVSS
C2
Recommended value 2
1.2kohm +/−8%
2.2μF +/−40%
2.2nF +/−40%
16k ~ 96kHz
2007/07