AK4601VQ Datasheet, PDF (84/111 Pages) Asahi Kasei Microsystems – Audio HUB CODEC with Digital Mixer

[AK4601]
DA1/2/3MUTE bit
0dB
Attenuation Level
-∞dB
924/fs
GD
924/fs
Group Delay (GD)
Output Image
Soft Mute Operation
Figure 71. DAC Sof Mute Operation
The analog output pin will be in a mode that outputs VCOM voltage by changing HRESETN pin to “0”
from “1” while PMDA bit = “1” when changing system clock during DAC operation. This mode can
prevent a click noise when the DAC resumes operation after changing the system clock (Figure 72,
CASE1). The analog output will be Hi-z state when changing HRESETN to “0” from “1” while PMDA bit =
“0”. A click noise may occur when resuming the DAC operation after the system clock is changed (Figure
72, CASE2).
HRESETN bit
CASE1
PMDAx bit “1”
Analog Output
VCOM Output
VCOM Output
VCOM Output
CASE2
PMDAx bit “0”
Analog Output
VCOM Output
HiZ
VCOM Output
Figure 72. Analog Output in HUB Reset
3. DAC Digital Filter Select
The AK4601 has four kinds of digital filters in DAC block. DASD and DASL bits select a digital filter.
Mode DASD bit DASL bit
Digital Filter
0
0
0
Sharp Roll-Off Filter
1
0
1
Slow Roll-Off Filter
2
1
0
Short Delay Sharp Roll-Off Filter (default)
3
1
1
Short Delay Slow Roll-Off Filter
Table 57. DAC Digital Filter Select
4. De-emphasis Filter Control
The AK4601 has a digital de-emphasis filter (tc=50/15µs) which corresponds to three sampling
frequencies (32kHz, 44.1kHz, 48kHz) by IIR filter. It is enabled or disabled with the DEMx[1:0] bits
(x=1~3) (Table 58).
016000391-E-01
- 84 -
2016/12