[AK4420]

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).

CVDD

Charge

Pump

CP

CN

VSS2

VEE

1uF

1uF

Negative Power

AK4420

(+)

Cb

Ca

(+)

Figure 5. Negative power generation circuit

AOUTR

AK4420

(AOUTL)

0V

2.12Vrms

Figure 6. Audio signal output

MS0683-E-02

2007/12

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