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AK4421ET Datasheet(PDF) 11 Page - Asahi Kasei Microsystems

Part No. AK4421ET
Description  192kHz 24-Bit Stereo ?誇 DAC with 2Vrms Output
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Manufacturer  AKM [Asahi Kasei Microsystems]
Direct Link  http://www.akm.com
Logo AKM - Asahi Kasei Microsystems

AK4421ET Datasheet(HTML) 11 Page - Asahi Kasei Microsystems

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[AK4421]
MS0945-E-01
2008/08
- 11 -
Zero detect function
When the input data for both channels are continuously zero for 8192 LRCK cycles, the DZF pin goes to “H”. The DZF
pin immediately returns to “L” if the input data for both channels are not zero (Figure 5).
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 AK4421 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 AK4421 is placed in reset mode automatically and the analog
outputs settle to VSS (0V, typ).
CVDD
Charge
Pump
CP
CN
VSS2
VEE
1uF
1uF
Negative Power
AK4421
(+)
Cb
Ca
(+)
Figure 5. Negative Power Generation Circuit
AOUTR
AK4421
(AOUTL)
0V
2Vrms
Figure 6. Audio Signal Output


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