ak4420 AKM Semiconductor, Inc., ak4420 Datasheet - Page 11

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

[AK4420]
■
Analog Output Block
The internal negative power supply generation circuit
(Figure
5) provides a negative power supply for the internal 2Vrms
amplifier. It allows the AK4420 to output an audio signal centered at VSS (0V, typ) as shown in
Figure
6. The negative
power generation circuit
(Figure
5) needs 1.0uF capacitors (Ca, Cb) with low ESR (Equivalent Series Resistance). If this
capacitor is polarized, the positive polarity pin should be connected to the CP and VSS2 pins. This circuit operates by
clocks generated from MCLK. When MCLK stops, the AK4420 is placed in the reset mode automatically and the analog
outputs settle to VSS (0V, typ).
AK4420
CVDD
Charge
Pump
Negative Power
CP
CN
VSS2
VEE
Cb
1uF
(+)
Ca
(+)
1uF
Figure 5. Negative Power Generation Circuit
AK4420
2.12Vrms
0V
AOUTR
(AOUTL)
Figure 6. Audio Signal Output
MS0683-E-04
2008/06
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