AK4420 Datasheet, PDF (11/19 Pages) Asahi Kasei Microsystems – 192kHz 24-Bit Stereo ΔΣ DAC with 2Vrms Output

[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
1uF Ca
(+)
AK4420
Figure 5. Negative power generation circuit
0V
AOUTR
(AOUTL)
2.12Vrms
Figure 6. Audio signal output
MS0683-E-02
- 11 -
2007/12