ASAHI KASEI
[AK4386]
n De-emphasis Filter
The AK4386 includes the digital de-emphasis filter (tc=50/15ms) by IIR filter. This filter corresponds to 44.1kHz
sampling. The de-emphasis filter is enabled by setting DEM pin “H”. In case of Half speed and Double speed mode, the
digital de•emphasis filter is always off.
Mode
DFS1 pin DFS0 pin DEM pin
De-emphasis Filter
L
L
L
H
H
H
L
L
H
L
H
H
L
H
*
*
L
H
OFF
ON
OFF
OFF
OFF
Normal Speed
Double Speed
Half Speed
Auto
ON (Note)
Table 4. De-emephasis Filter (*: Don’t care)
Note. The digital de-emphasis filter corresponds to 44.1kHz sampling.
In case of Half speed and Double speed mode, the digital de•emphasis filter is always off.
n Power-down
The AK4386 is placed in the power-down mode by bringing PDN pin = “L”. and the digital filter is reset at the same time.
This reset should always be done after power up.
When PDN pin = “L”, DAC outputs go to Hi-Z. Also, the internal power down is automatically done when MCLK stops
during operating (PDN pin =“H”), and the analog outputs go to the VCOM voltage. MCLK pin should be fixed to “H” or
“L” when MCLK stops.
Mode
PDN pin
L
MCLK
Don’t care
Supplied
DAC Output
Hi-Z
Normal Output
VCOM Voltage
State
Full Power Down
Normal
0
1
2
H
Not Supplied
Power Save
Table 5. Power down mode
MS0280-E-00
2003/12
- 11 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
