AK4621 AKM [Asahi Kasei Microsystems], AK4621 Datasheet - Page 25

• Manufacturer Part Number: AK4621
• Description: 24-Bit 192kHz Stereo Audio CODEC
• Manufacturer: AKM [Asahi Kasei Microsystems]

■
The AK4621 has two kinds of Digital Filter for ADC and three kinds of Digital Filter for DAC. The outputs of ADC and
DAC can be controlled by using the SDFIL pin or SDAD/SDDA/SLOW bits.
■
The DAC includes a digital de-emphasis filter (tc=50/15μs for 32kHz, 44.1kHz or 48kHz sampling rates) by an integrated
IIR filter. Setting the DEM1-0 bits enables the de-emphasis filter. This filter is always OFF in double and quad speed
modes. The DEM0 pin and DEM0 bit are OR’d in serial control mode. In parallel control mode, the DEM1 bit is fixed to
“0” and only the DEM0 pin can be controlled (44.1kHz or OFF).
MS1258-E-01
Digital Filter
De-emphasis Filter
SDFIL pin
SDDA bit
Table 16. DAC Digital Filter Selection in Serial Mode (N/A: Not Available)
H
L
0
0
1
1
SDAD bit
No
0
1
2
3
0
1
Table 15. ADC Digital Filter Selection in Serial Mode
Table 17. De-emphasis control (Normal Speed Mode)
Short Delay Sharp Roll Off Filter
SLOW bit
Table 14. Digital Filter Selection in Parallel Mode
0
1
0
1
DEM1
Sharp Roll Off Filter
0
0
1
1
Short Delay Sharp Roll Off Filter
ADC
Short Delay Sharp Roll Off Filter
Sharp Roll Off Filter
Sharp Roll Off Filter
Slow Roll Off Filter
DEM0
- 25 -
0
1
0
1
ADC
DAC
N/A
Short Delay Sharp Roll Off Filter
44.1kHz
48kHz
32kHz
Mode
OFF
Sharp Roll Off Filter
(default)
(default)
DAC
(default)
[AK4621]
2011/01