AK4430 Datasheet, PDF (10/18 Pages) Asahi Kasei Microsystems – 192kHz 24-Bit Stereo ΔΣ DAC with 2Vrms Output

[AK4430]
LRCK
BICK
(64fs)
SDTI
01
2
22 23 24
30 31 0 1
2
22 23 24
30 31 0 1
23 22
1 0 Don’t care
23:MSB, 0:LSB
Lch Data
23 22
Figure 3. Mode 0 Timing
1 0 Don’t care
Rch Data
23 22
LRCK
BICK
(64fs)
SDTI
0123
23 24 25
31 0 1 2 3
23 24 25
31 0 1
23 22
1 0 Don’t care
23 22
1 0 Don’t care
23
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 4. Mode 1 Timing
■ 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 AK4430 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 AK4430 is placed in reset mode automatically and the analog
outputs settle to VSS (0V, typ).
AK4430
CVDD
Charge
Pump
Negative Power
MS1196-E-01
CP
CN VSS2
Cb
(+)
1uF Ca
(+)
VEE
1uF
Figure 5. Negative Power Generation Circuit
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2011/03