AK4440 AKM [Asahi Kasei Microsystems], AK4440 Datasheet - Page 17

• Manufacturer Part Number: AK4440
• Description: 192kHz 24-Bit 8ch DAC with 2Vrms Output
• Manufacturer: AKM [Asahi Kasei Microsystems]

■
The internal negative power supply generation circuit
2Vrms amplifier. It allows the AK4440 to output an audio signal centered at VSS (0V, typ) as shown in
negative power generation circuit
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 AK4440 is placed in the reset mode automatically
and the analog outputs settle to VSS (0V, typ).
■
A digital de-emphasis filter is available for 32, 44.1 or 48kHz sampling rates (tc = 50/15 μ s). For double speed and quad
speed modes, the digital de-emphasis filter is always off. In serial control mode, the DEM1-0 bits are valid for the DAC
enabled by the DEMA-D bits
MS1088-E-01
Analog Output Block
De-emphasis Filter
Table 9 De-emphasis Filter Control in Serial Control Mode (Normal Speed Mode)
AK4440
VDD
(Table
DEM1 bit
(Figure
AK4440
0
0
1
1
Figure 16. Negative Power Generation Circuit
9). In parallel control mode, DEM1-0 pins are valid
CP
16) needs 1.0μF low ESR (Equivalent Series Resistance) capacitors (Ca, Cb).
(ROUT)
LOUT
Figure 17. Audio Signal Output
(+)
Charge
1uF
Pump
DEM0 bit
CN
Ca
(Figure
0
1
0
1
0V
VSS2
- 17 -
16) provides a negative power supply for the internal
44.1kHz
Cb
48kHz
32kHz
Mode
OFF
(+)
2.12Vrms
1uF
VEE
(default)
Negative Power
(Table
10).
Figure
[AK4440]
17. The
2011/03