ak4586 AKM Semiconductor, Inc., ak4586 Datasheet - Page 21

• Manufacturer Part Number: ak4586
• Description: Multi-channel Audio Codec With Dir
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The AK4586 includes the digital de-emphasis filter (tc=50/15µs) by IIR filter corresponding to three sampling
frequencies (32kHz, 44.1kHz and 48kHz). When DEAU bit = “1”, the de-emphasis filter is enabled automatically by
sampling frequency and pre-emphasis information in the channel status. The AK4586 goes to this mode at default and the
de-emphasis filter is controlled by the status bits in channel 1 (Table 8). DEM1-0 and DFS bits can control the
de-emphasis filter when DEAU is “0” (Table 9). The internal de-empahsis filter is bypassed and the recovered data is
output without any change if either pre-emphasis or de-emphasis mode is OFF. The internal de-emphasis filter is
bypassed if the Non-PCM or the DTS-CD bitstream is detected at DEAU= “1”. The internal de-emphasis filter is
bypassed if bit 0 of the channel status byte 0 is “1”.
The AK4586 has a power-down mode for all circuits by PDN pin or can be partially powered-down by internal register.
The AK4586 should be reset once by bringing PDN pin = “L” upon power-up. ADC, DAC and PLL are powered-down at
PWVRN= “0”.
MS0097-E-01
De-emphasis Filter Control
System Reset and Power-Down
PDN
L
x
x
x
x
x
x
PWADN
x
0
x
x
x
x
x
Table 9. De-emphasis Manual Control at DEAU=“0” and PEM=“1”
Sampling Speed
PWDAN
Table 8. De-emphasis Auto Control at DEAU=“1” and PEM=“1”
Normal Speed
Normal Speed
Normal Speed
Normal Speed
Double Speed
Double Speed
Double Speed
Double Speed
x
x
0
x
x
x
x
RFS96
0
0
0
0
1
1
1
1
PWVRN
x
x
x
0
x
x
x
Table 10. Reset & Power Down
FS1
0
0
1
1
0
0
1
1
DEM1
RSTN
0
0
1
1
0
0
1
1
x
x
x
x
0
x
x
- 21 -
FS0
CM1-0
0
1
0
1
0
1
0
1
00
01
x
x
x
x
x
DEM0
0
1
0
1
0
1
0
1
ADC power down
DAC power down
VREF power down
Timing Reset
X’tal power down
PLL power down
All power down
44.1kHz
48kHz
32kHz
DEM
OFF
OFF
OFF
OFF
OFF
Function
44.1kHz
48kHz
32kHz
DEM
OFF
OFF
OFF
OFF
OFF
Default
Default
Register initialization
Yes
No
No
No
No
No
No
[AK4586]
2001/12